10701fe
1
LT1070/LT1071
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
5A and 2.5A High Efficiency
Switching Regulators
n Wide Input Voltage Range: 3V to 60V
n Low Quiescent Current: 6mA
n Internal 5A Switch (2.5A for LT1071)
n Very Few External Parts Required
n Self Protected Against Overloads
n Operates in Nearly All Switching Topologies
n Shutdown Mode Draws Only 50m A Supply Current
n Flyback Regulated Mode Has Fully Floating Outputs
n Comes in Standard 5-Pin TO-220 Package
n Can be Externally Synchronized (Consult Factory)
The LT®1070/LT1071 are monolithic high power switch-
ing regulators. They can be operated in all standard switch-
ing configurations including buck, boost, flyback, for-
ward, inverting and “Cuk”. A high current, high efficiency
switch is included on the die along with all oscillator,
control and protection circuitry. Integration of all func-
tions allows the LT1070/LT1071 to be built in a standard
5-pin T0-220 power package. This makes it extremely
easy to use and provides “bust proof” operation similar to
that obtained with 3-pin linear regulators.
The LT1070/LT1071 operate with supply voltages from 3V
to 60V, and draw only 6mA quiescent current. They can
deliver load power up to 100W with no external power
devices. By utilizing current mode switching techniques,
they provide excellent AC and DC load and line regulation.
The LT1070/LT1071 have many unique features not found
even on the vastly more difficult to use low power control
chips presently available. They use adaptive antisat switch
drive to allow very wide ranging load currents with no loss
in efficiency. An externally activated shutdown mode
reduces total supply current to 50m A typical for standby
operation. Totally isolated and regulated outputs can be
generated by using the optional “flyback regulation mode”
built into the LT1070/LT1071, without the need for
optocouplers or extra transformer windings.
USER NOTE:
This data sheet is only intended to provide specifications, graphs and a general functional
description of the LT1070/LT1071. Application circuits are included to show the capability of the
LT1070/LT1071. A complete design manual (AN19) should be obtained to assist in developing new
designs. This manual contains a comprehensive discussion of both the LT1070 and the external
components used with it, as well as complete formulas for calculating the values of these
components. The manual can also be used for the LT1071 by factoring in the lower switch current
rating. A second Application Note, AN25, which details off-line applications is available.
+ R1
10.7k
1%
R2
1.24k
1%
1070/71 TA01
12V
1A
R3
1k
C1
1m F
C2
1000 m F
+
C3*
100 m F
L1**
150 m H
D1
5V
VSW
VC
VIN
LT1070
GND FB
C3
100 m F
L2
10 m H
OUTPUT
FILTER
*
**
REQUIRED IF INPUT LEADS ‡ 2"
PULSE ENGINEERING 92113
INPUT VOLTAGE (V)
0
PO
W
ER
(W
)*
*
60
80
100
40
1070/71 TA02
40
20
0
10 20 30 50
BOOST
BUCK/BOOST
VO = 30V
FLYBACK
ISOLATED
BUCK/BOOST
VO = 5V
ROUGH GUIDE ONLY. BUCK MODE POUT = 5A • VOUT.
SPECIAL TOPOLOGIES DELIVER MORE POWER
DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071
*
**
Maximum Output Power*
Boost Converter (5V to 12V)
n Logic Supply 5V at 10A
n 5V Logic to – 15V Op Amp Supply
n Off-Line Converter Up to 200W
n Battery Upconverter
n Power Inverter (+ to –) or (– to +)
n Fully Floating Multiple Outputs
n For Lower Current Applications, See the LT1072
, LTC and LT are registered trademarks of Linear Technology Corporation.
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2
LT1070/LT1071
10701fe
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VREF Reference Voltage Measured at Feedback Pin, VC = 0.8V 1.224 1.244 1.264 V
l 1.214 1.244 1.274 V
IB Feedback Input Current VFB = VREF 350 750 nA
l 1100 nA
gm Error Amplifier Transconductance D IC = – 25m A 3000 4400 6000 m mho
l 2400 7000 m mho
Error Amplifier Source or Sink Current VC = 1.5V 150 200 350 m A
l 120 400 m A
Error Amplifier Clamp Voltage Hi Clamp, VFB = 1V 1.80 2.30 V
Lo Clamp, VFB = 1.5V 0.25 0.38 0.52 V
Reference Voltage Line Regulation 3V £ VIN £ VMAX, VC = 0.8V l 0.03 %/V
AV Error Amplifier Voltage Gain 0.9V £ VC £ 1.4V 500 800 V/V
Minimum Input Voltage l 2.6 3.0 V
IQ Supply Current 3V £ VIN £ VMAX, VC = 0.6V 6 9 mA
Control Pin Threshold Duty Cycle = 0 0.8 0.9 1.08 V
l 0.6 1.25 V
Normal/Flyback Threshold on Feedback Pin 0.4 0.45 0.54 V
ABSOLUTE MAXIMUM RATINGS
W
WW U
Supply Voltage
LT1070/LT1071 (Note 2) .................................... 40V
LT1070HV/LT1071HV (Note 2) .......................... 60V
Switch Output Voltage
LT1070/LT1071 .................................................. 65V
LT1070HV/LT1071HV ........................................ 75V
Feedback Pin Voltage (Transient, 1ms) ................ – 15V
Operating Junction Temperature Range
Commercial (Operating) ....................... 0 ° C to 100 ° C
Commercial (Short Circuit) ................... 0 ° C to 125 ° C
Industrial ......................................... – 40° C to 125 ° C
Military (OBSOLETE) ................. – 55° C to 150 ° C
Storage Temperature Range ................ – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec)................. 300° C
PACKAGE/ORDER INFORMATION
W UU
ORDER PART
NUMBER
LT1070CK
LT1070HVCK
LT1070HVMK
LT1070IK
LT1070MK
LT1071CK
LT1071HVCK
LT1071HVMK
LT1071MK
ORDER PART
NUMBER
LT1070CT
LT1070HVCT
LT1070HVIT
LT1070IT
LT1071CT
LT1071HVCT
LT1071HVIT
LT1071IT
TJMAX = 100° C, q JA = 35 ° C/ W, QJC = 2 ° C (LT1070C, I)
TJMAX = 150° C, q JA = 35 ° C/ W, QJC = 2 ° C (LT1070M)
TJMAX = 100° C, q JA = 35 ° C/ W, QJC = 4 ° C (LT1071C, I)
TJMAX = 150° C, q JA = 35 ° C/ W, QJC = 4 ° C (LT1071M)
2
4
1
3
VSW VC
FB
CASE
IS GND
VIN
K PACKAGE
4-LEAD TO-3 METAL CAN
BOTTOM VIEW
TJMAX = 100° C, q JA = 75 ° C/ W, QJC = 2 ° C (LT1070C, I)
TJMAX = 100° C, q JA = 75 ° C/ W, QJC = 4° C (LT1071C)
T PACKAGE
5-LEAD PLASTIC TO-220
VIN
VSW
GND
FB
VC
FRONT VIEW
5
4
3
2
1
ELECTRICAL CHARACTERISTICS
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
OBSOLETE PACKAGE
Consider the T5 Package for Alternate Source
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25 ° C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open unless otherwise specified.
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10701fe
3
LT1070/LT1071
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VFB Flyback Reference Voltage IFB = 50m A 15 16.3 17.6 V
l 14 18.0 V
Change in Flyback Reference Voltage 0.05 £ IFB £ 1mA 4.5 6.8 8.5 V
Flyback Reference Voltage Line Regulation IFB = 50 m A, 3V £ VIN £ VMAX (Note 3) 0.01 0.03 %/V
Flyback Amplifier Transconductance (gm) D IC = – 10 m A 150 300 650 m mho
Flyback Amplifier Source and Sink Current VC = 0.6V, IFB = 50m A (Source) l 15 32 70 m A
VC = 0.6V, IFB = 50m A (Sink) l 25 40 70 m A
BV Output Switch Breakdown Voltage 3V £ VIN £ VMAX, ISW = 1.5mA
(LT1070/LT1071) l 65 90 V
(LT1070HV/LT1071HV) l 75 90 V
VSAT Output Switch “On” Resistance (Note 4) LT1070 l 0.15 0.24 W
LT1071 l 0.30 0.50 W
Control Voltage to Switch Current LT1070 8 A/V
Transconductance LT1071 4 A/V
ILIM Switch Current Limit (LT1070) Duty Cycle £ 50%, TJ ‡ 25° C l 5 10 A
Duty Cycle £ 50%, TJ < 25° C l 5 11 A
Duty Cycle = 80% (Note 5) l 4 10 A
Switch Current Limit (LT1071) Duty Cycle £ 50%, TJ ‡ 25° C l 2.5 5.0 A
Duty Cycle £ 50%, TJ < 25° C l 2.5 5.5 A
Duty Cycle = 80% (Note 5) l 2.0 5.0 A
D IIN Supply Current Increase During 25 35 mA/A
D ISW Switch “On” Time
f Switching Frequency 35 40 45 kHz
l 33 47 kHz
DC (Max) Maximum Switch Duty Cycle 90 92 97 %
Flyback Sense Delay Time 1.5 m s
Shutdown Mode Supply Current 3V £ VIN £ VMAX, VC = 0.05V 100 250 m A
Shutdown Mode Threshold Voltage 3V £ VIN £ VMAX 100 150 250 mV
l 50 300 mV
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Minimum switch “on” time for the LT1070/LT1071 in current limit is
» 1 m s. This limits the maximum input voltage during short-circuit conditions,
in the buck and inverting modes only, to » 35V. Normal (unshorted) conditions
are not affected. Mask changes are being implemented which will reduce
minimum “on” time to £ 1 m s, increasing maximum short-circuit input voltage
above 40V. If the present LT1070/LT1071 (contact factory for package date
code) is being operated in the buck or inverting mode at high input voltages
and short-circuit conditions are expected, a resistor must be placed in series
with the inductor, as follows:
The value of the resistor is given by:
R = – RL
t • f • VIN – VF
ILIMIT
t = Minimum “on” time of LT1070/LT1071 in current limit, » 1 m s
f = Operating frequency (40kHz)
VF = Forward voltage of external catch diode at ILIMIT
ILIMIT = Current limit of LT1070 (» 8A), LT1071 ( » 4A)
RL = Internal series resistance of inductor
Note 3: VMAX = 55V for LT1070HV and LT1071HV to avoid switch
breakdown.
Note 4: Measured with VC in hi clamp, VFB = 0.8V. ISW = 4A for LT1070
and 2A for LT1071.
Note 5: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by ILIM = 3.33 (2 – DC) for the
LT1070 and ILIM = 1.67 (2 – DC) for the LT1071.
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25° C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open unless otherwise specified.
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4
LT1070/LT1071
10701fe
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Switch Current Limit vs Duty Cycle
DUTY CYCLE (%)
0
SW
IT
CH
C
UR
RE
NT
(A
)
16
14
12
10
8
6
4
2
0
80
1070/71 G01
20 40 60 1007010 30 50 90
FOR LT1071, DIVIDE
VERTICAL SCALE BY 2
–55°C
125°C
25°C
Flyback Blanking Time
JUNCTION TEMPERATURE (°C)
–75
1.0
TI
M
E
(m
s)
1.2
1.6
1.8
2.0
–25 25 50 150
1070/71 G03
1.4
–50 0 75 100 125
2.2
JUNCTION TEMPERATURE (°C)
–75
90
DU
TY
C
YC
LE
(%
)
91
93
94
95
–25 25 50 150
1070/71 G02
92
–50 0 75 100 125
96
Maximum Duty Cycle
Minimum Input Voltage
TEMPERATURE (°C)
–75
2.3
M
IN
IM
UM
IN
PU
T
VO
LT
AG
E
(V
)
2.4
2.6
2.7
2.8
–25 25 50 150
1070/71 G04
2.5
–50 0 75 100 125
2.9
SWITCH CURRENT = 5A
SWITCH CURRENT = 0A
Switch Saturation Voltage
SWITCH CURRENT (A)
0
SW
IT
CH
S
AT
UR
AT
IO
N
VO
LT
AG
E
(V
)
0.8
1.2
8
1070/71 G05
0.4
0
1.0
25°C
1.4
0.6
0.2
2 4 61 3 5 7
1.6
FOR LT1071, DIVIDE
CURRENT BY 2
100°C
–55°C
150°C
TEMPERATURE (°C)
–75
FL
YB
AC
K
VO
LT
AG
E
(V
)
19
20
21
125
1070/71 G06
18
17
15
–25 25 75–50 1500 50 100
16
23
22
RFEEDBACK = 500W
RFEEDBACK = 1k
RFEEDBACK = 10k
Line Regulation
Feedback Bias Current
vs Temperature
INPUT VOLTAGE (V)
0
–5
RE
FE
RE
NC
E
VO
LT
AG
E
CH
AN
GE
(m
V)
–3
–1
1
10 20 30 40
1070/71 G07
50
3
5
–4
–2
0
2
4
60
TJ = 150°C
TJ = 25°C
TJ = –55°C
TEMPERATURE (°C)
–75
FE
ED
BA
CK
B
IA
S
CU
RR
EN
T
(n
A)
600
500
400
300
200
100
0
125
1070/71 G09
–25 25 75–50 1500 50 100
800
700
Reference Voltage
vs Temperature
TEMPERATURE (°C)
–75
RE
FE
RE
NC
E
VO
LT
AG
E
(V
)
SW
ITCHING FREQUENCY (kHz)
1.246
1.244
1.242
1.240
1.238
1.236
1.234
125
1070/71 G08
–25 25 75–50 1500 50 100
1.250
1.248
40
39
38
37
36
35
34
42
41SWITCHING
FREQUENCY
REFERENCE
V0LTAGE
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10701fe
5
LT1070/LT1071
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Supply Current vs Supply Voltage
(Shutdown Mode)Driver Current* vs Switch Current
SWITCH CURRENT (A)
0
DR
IV
ER
C
UR
RE
NT
(m
A)
160
140
120
100
80
60
40
20
0
4
1070/71 G10
1
*
2 3 5
TJ ‡ 25°C
AVERAGE LT1070 POWER SUPPLY CURRENT IS
FOUND BY MULTIPLYING DRIVER CURRENT BY
DUTY CYCLE, THEN ADDING QUIESCENT CURRENT
TJ = –55°C
SUPPLY VOLTAGE (V)
0
SU
PP
LY
C
UR
RE
NT
(m
A)
60
80
100
30 50
1070/71 G12
40
20
0
10 20 40
120
140
160
60
TJ = 25°C
VC = 50mV
VC = 0V
Supply Current vs Input Voltage*
INPUT VOLTAGE (V)
0
6
IN
PU
T
CU
RR
EN
T
(m
A)
8
10
12
10 20 30
*
40
1070/71 G11
50
14
UNDER VERY LOW OUTPUT CURRENT
CONDITIONS, DUTY CYCLE FOR MOST
CIRCUITS WILL APPROACH 10% OR LESS
16
7
9
11
13
15
60
TJ = 25°C
ISWITCH £ 10mA
90% DUTY CYCLE
50% DUTY CYCLE
0% DUTY CYCLE
10% DUTY CYCLE
Feedback Pin Clamp VoltageShutdown Thresholds
TEMPERATURE (°C)
–75
V C
P
IN
V
OL
TA
GE
(m
V) VC PIN CURRENT (
mA)
300
250
200
150
100
50
0
125
1070/71 G16
–25 25 75–50 1500 50 100
400
350
–300
–250
–200
–150
–100
–50
0
–400
–350
VC VOLTAGE IS REDUCED UNTIL
REGULATOR CURRENT DROPS
BELOW 300 m A
VOLTAGE
CURRENT
(OUT OF VC PIN)
FEEDBACK CURRENT (mA)
0
FE
ED
BA
CK
V
OL
TA
GE
(m
V)
300
400
500
0.8
1070/71 G18
200
100
250
350
450
150
50
0
0.2 0.4 0.60.1 0.90.3 0.5 0.7 1.0
–55°C
25°C
150°C
TEMPERATURE (°C)
–75
ID
LE
S
UP
PL
Y
CU
RR
EN
T
(m
A)
7
9
11
125
1070/71 G14
5
3
6
8
10
4
2
1
–25 25 75–50 1500 50 100
VC = 0.6V
VSUPPLY = 60V
VSUPPLY = 3V
Idle Supply Current
vs Temperature
Normal/Flyback Mode Threshold
on Feedback Pin
TEMPERATURE (°C)
–50
400
FE
ED
BA
CK
P
IN
V
OL
TA
GE
(m
V)
FEEDBACK PIN CURRENT (
mA)
410
430
440
450
500
470
0 50 75
1070/71 G13
420
480
490
460
–4
–6
–10
–12
–14
–24
–18
–8
–20
–22
–16
–25 25 100 125 150
FEEDBACK PIN VOLTAGE
(AT THRESHOLD)
FEEDBACK PIN CURRENT
(AT THRESHOLD)
Error Amplifier Transconductance
TEMPERATURE (°C)
–75
TR
AN
SC
ON
DU
CT
AN
CE
(m
m
ho
)
3000
4000
5000
125
1070/71 G14
2000
1000
2500
3500
4500
1500
500
0
–25 25 75–50 1500 50 100
gm =
(VC PIN)
(FB PIN)
D I
D V
Shutdown Mode Supply Current
VC PIN VOLTAGE (mV)
0
SU
PP
LY
C
UR
RE
NT
(m
A)
120
160
200
80
1070/71 G14
80
40
100
140
180
60
20
0
20 40 6010 9030 50 70 100
TJ = 150°C
–55°C £ TJ £ 125°C
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6
LT1070/LT1071
10701fe
TYPICAL PERFORMANCE CHARACTERISTICS
UW
voltage is obtained by using the output of a voltage
sensing error amplifier to set current trip level. This
technique has several advantages. First, it has immediate
response to input voltage variations, unlike ordinary
switchers which have notoriously poor line transient
response. Second, it reduces the 90° phase shift at
The LT1070/LT1071 is a current mode switcher. This
means that switch duty cycle is directly controlled by
switch current rather than by output voltage. Referring to
the Block Diagram, the switch is turned “on” at the start
of each oscillator cycle. It is turned “off” when switch
current reaches a predetermined level. Control of output
OPERATION
U
Switch “Off” Characteristics
SWITCH VOLTAGE (V)
0
SW
IT
CH
C
UR
RE
NT
(m
A)
600
800
1000
80
1070/71 G19
400
200
500
700
900
300
100
0
20 40 6010 9030 50 70 100
VSUPPLY =
3V 15V 40V 55V
FREQUENCY (Hz)
1000
TR
AN
SC
ON
DU
CT
AN
CE
(m
m
ho
)
PHASE (
°)
3000
4000
6000
7000
1k 100k 1M 10M
1070/71 G21
–1000
10k
5000
2000
0
150
90
q
60
0
–30
210
30
120
180
gm
Transconductance of Error
AmplifierVC Pin Characteristics
VC PIN VOLTAGE (V)
0
–400
V C
P
IN
C
UR
RE
NT
(m
A)
–300
–200
–100
300
100
0.5 1.0
200
0
1.5 2.0 2.5
1070/71 G20
VFB = 1.5V
(CURRENT INTO
VC PIN)
VFB = 0.8V
(CURRENT OUT OF VC PIN)
TJ = 25°C
BLOCK DIAGRAM
W
–
+
–
+
ERROR
AMP
CURRENT
AMP
0.02W
(0.04W LT1071)
SHUTDOWN
CIRCUIT
MODE
SELECT
40kHz
OSC
LOGIC DRIVER
ANTISAT
16V
5A, 75V
SWITCH
VIN
FB
VC
COMP
GAIN » 6
0.15V
1070/71 BD
1.24V
REF
2.3V
REG
FLYBACK
ERROR
AMP
SWITCH
OUT
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10701fe
7
LT1070/LT1071
OPERATION
U
midfrequencies in the energy storage inductor. This
greatly simplifies closed-loop frequency compensation
under widely varying input voltage or output load condi-
tions. Finally, it allows simple pulse-by-pulse current
limiting to provide maximum switch protection under
output overload or short-circuit conditions. A low drop-
out internal regulator provides a 2.3V supply for all
internal circuitry of the LT1070/LT1071. This low drop-
out design allows input voltage to vary from 3V to 60V
with virtually no change in device performance. A 40kHz
oscillator is the basic clock for all internal timing. It turns
“on” the output switch via the logic and driver circuitry.
Special adaptive antisat circuitry detects onset of satura-
tion in the power switch and adjusts driver current
instantaneously to limit switch saturation. This mini-
mizes driver dissipation and provides very rapid turn-off
of the switch.
A 1.2V bandgap reference biases the positive input of the
error amplifier. The negative input is brought out for
output voltage sensing. This feedback pin has a second
function; when pulled low with an external resistor, it
programs the LT1070/LT1071 to disconnect the main
error amplifier output and connects the output of the
flyback amplifier to the comparator input. The LT1070/
LT1071 will then regulate the value of the flyback pulse
with respect to the supply voltage. This flyback pulse is
directly proportional to output voltage in the traditional
transformer coupled flyback topology regulator. By regu-
lating the amplitude of the flyback pulse, the output
voltage can be regulated with no direct connection be-
tween input and output. The output is fully floating up to
the breakdown voltage of the transformer windings.
Multiple floating outputs are easily obtained with addi-
tional windings. A special delay network inside the LT1070/
LT1071 ignores the leakage inductance spike at the
leading edge of the flyback pulse to improve output
regulation.
The error signal developed at the comparator input is
brought out externally. This pin (VC) has four different
functions. It is used for frequency compensation, current
limit adjustment, soft starting and total regulator shut-
down. During normal regulator operation this pin sits at
a voltage between 0.9V (low output current) and 2.0V
(high output current). The error amplifiers are current
output (gm) types, so this voltage can be externally
clamped for adjusting current limit. Likewise, a capacitor
coupled external clamp will provide soft start. Switch
duty cycle goes to zero if the VC pin is pulled to ground
through a diode, placing the LT1070/LT1071 in an idle
mode. Pulling the VC pin below 0.15V causes total
regulator shutdown, with only 50m A supply current for
shutdown circuitry biasing. See AN19 for full application
details.
TYPICAL APPLICATIONS
U
(Note that maximum output currents are divided by 2 for the LT1071)
R1*
R2**
1070/71 TA16
D1
SETS IB(ON)
SETS IB(OFF)
*
**
D2
C1
VSW
VIN
LT1070/LT1071
GND
Q1
Driving High Voltage NPN
Driving High Voltage FET (for Off-Line
Applications, See AN25)
1070/71 TA031070/71 TA03
10V
TO
20V
D1
VSW
G D
S
Q1
VIN
LT1070/LT1071
GND
+
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LT1070/LT1071
10701fe
TYPICAL APPLICATIONS
U
(Note that maximum output currents are divided by 2 for the LT1071)
Negative Current Boosted Buck Converter
1070/71 TA13
R3 R2
1.24k
Q1
2N3906
R4
12k
C2
C3
R1
MINIMUM
LOAD = 10mA –VOUT
5V
10A
D1
T1
1:NR5
•
•
C1
VSW
VC
VIN
–VIN
LT1070
GND FB
+
+
VOUT – 0.6V
1mA
R1 =
1070/71 TA12
R3 R21.24k
*
**
REQUIRED IF INPUT LEADS ‡ 2"
PULSE ENGINEERING 92113
Q1
2N3906
R1
4.64k
C1
C2
1000 m F
C3
100m F
VIN
–20V
–5.2V
4.5A
D1
L1**
200 m H
VSW
VC
VIN
LT1070
GND
OPTIONAL INPUT
FILTER FB
LOAD
C4
200 m F
L2
4m H
OPTIONAL
OUTPUT
FILTER
+
+
+
L3
Negative Buck Converter
Positive Buck Converter
R2
1.24k R4
10 W
100mA
MINIMUM
1070/71 TA14
5V
4.5A
R3
470 W
C1
1m F
D1
r
+
C3
2.2 m F
+
C5*
100 m F
+
C2
1m F
+
C4
1000 m F
L1**
100 m H
VSW
VC
VIN
VIN
LT1070
R1
3.74k
D2
1N914
GND FB
D3 L2
4m H
C5
200 m F
OPTIONAL
OUTPUT
FILTER
*
**
REQUIRED IF INPUT LEADS ‡ 2"
PULSE ENGINEERING 921
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