Quick Reference Guide
for Isolated and Off-Line
PWM Controllers and
Other Useful Helper ICs
This document lists data sheets and applications information for isolated power
supply designs. Links, shown in blue, take you to the full documentation on the
Maxim website.
General Description
The MAX5021/MAX5022 current-mode PWM controllers
contain all the control circuitry required for the design
of wide input voltage range isolated power supplies.
These devices are well suited for use in universal input
(85VAC to 265VAC) off-line or telecom (-36VDC to
-72VDC) power supplies.
An undervoltage lockout (UVLO) circuit with large hys-
teresis coupled with low startup and operating current
reduce power dissipation in the startup resistor and
allow use of ceramic bypass capacitors. The 262kHz
switching frequency is internally trimmed to ±12%
accuracy; this allows the optimization of the magnetic
and filter components resulting in compact, cost-effec-
tive power supplies. The MAX5021 with 50% maximum
duty cycle and MAX5022 with 75% maximum duty
cycle are recommended for forward converters and fly-
back converters, respectively. The MAX5021/MAX5022
are available in 6-pin SOT23, 8-pin µMAX, and 8-pin
DIP packages and are rated for operation over the
-40°C to +85°C temperature range.
Applications
Universal Off-Line Power Supplies
Standby Power Supplies
Isolated Power Supplies
Isolated Telecom Power Supplies
Mobile Phone Chargers
Features
♦ Available in a Tiny 6-Pin SOT23 Package
♦ 50µA Typical Startup Current
♦ 1.2mA Typical Operating Current
♦ Large UVLO Hysteresis of 14V
♦ Fixed Switching Frequency of 262kHz ±12%
♦ 50% Maximum Duty Cycle Limit (MAX5021)
♦ 75% Maximum Duty Cycle Limit (MAX5022)
♦ 60ns Cycle-by-Cycle Current-Limit Response
Time
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Current-Mode PWM Controllers for Isolated
Power Supplies
________________________________________________________________ Maxim Integrated Products
GND
VCCNDRV
1 6 OPTO
5 VIN
CS
MAX5021
MAX5022
SOT23
TOP VIEW
2
3 4
NDRV
N.C.N.C.
1
2
8
7
CS
GNDVIN
VCC
OPTO
PDIP/µMAX
3
4
6
5
MAX5021
MAX5022
Pin Configuration
Ordering Information
MAX5021
MAX5022
VOUT
VSUPPLY
OPTO NDRV
CS
VCC
VIN
GND
Typical Operating Circuit
19-2066; Rev 1; 9/01
EVALUATION K
IT AVAILABLE
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
MAX
DUTY
CYCLE
TEMP.
RANGE
PIN-
PACKAGE
TOP
MARK
MAX5021EUT 50% -40°C to +85°C 6 SOT23-6 AASQ
MAX5021EUA 50% -40°C to +85°C 8 µMAX —
MAX5021EPA 50% -40°C to +85°C 8 PDIP —
MAX5022EUT 75% -40°C to +85°C 6 SOT23-6 AASR
MAX5022EUA 75% -40°C to +85°C 8 µMAX —
MAX5022EPA 75% -40°C to +85°C 8 PDIP —
WARNING: The MAX5021/MAX5022 are designed to work
with high voltages. Exercise caution!
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MAX5022 Evaluation Kit
_______________________________________________________________________________________
63 5
TE
RM
IN
AL
B
LO
CK
TB
-1
TB
-2
F1
3
2
1
4
AC AC
D3
L2
47
0µ
H
R8
1.
2k
Ω
C1
10
µF
40
0V
C9
10
µF
40
0V
R1
36
0k
Ω
R1
2
10
0k
Ω
C1
1
10
00
pF
R2 36
0k
Ω
C2 0.
22
µF
L3
D4 D1
1
7
8
9
C7
10
00
pF
C4
47
µF 6.3
V
R3 1k
Ω
1%
1
U2
-A
R1
0
10
Ω C
5
0.
01
µF
3
4
5
U3
2
R5
8.
06
kΩ 1%R
4
24
.9
kΩ 1%
C6 0.
1µ
F
C1
0
47
µF
6.
3V
+5
V
VO
UT
GN
D
L1
D2
10
11
12
T1
CT
X0
3_
15
25
6
N1
R6 10
Ω
R7 1.
78
Ω
1%
C8
82
00
pF
1
CS
3
ND
RV
5
V I
N
V C
C
4 6 2
R1
1
1.
5k
Ω
1%
C1
2
0.
01
µFC3
0.
22
µF
5 4
6
U2
-B
R9
24
0k
Ω
OP
TO
GN
D
M
AX
50
22
U1
SE
CO
ND
AR
Y
GR
OU
ND
PR
IM
AR
Y
GR
OU
ND
NO
TE
: A
LL
R
ES
IS
TO
RS
A
RE
5
%
U
NL
ES
S
OT
HE
RW
IS
E
SP
EC
IF
IE
D
Figure 2. MAX5022 EV Kit Schematic
General Description
The MAX5052/MAX5053 current-mode PWM controllers
contain all the control circuitry required for the design of
wide-input-voltage isolated and nonisolated power
supplies. The MAX5052 is well suited for universal input
(rectified 85VAC to 265VAC) or telecom (-36VDC to
-72VDC) power supplies. The MAX5053 is well suited for
low-input-voltage (10.8VDC to 24VDC) power supplies.
The MAX5052/MAX5053 contain an internal error ampli-
fier that regulates the tertiary winding output voltage.
This implements a primary-side regulated, isolated
power supply, eliminating the need for an optocoupler.
An input undervoltage lockout (UVLO) is provided for
programming the input-supply start voltage and to
ensure proper operation during brownout conditions.
The input-supply start voltage is externally programma-
ble with a voltage-divider. To shutdown the device, the
UVLO pin is pulled low. Internal digital soft-start
reduces output voltage overshoot. The internal thermal
shutdown circuit protects the device in the event the
junction temperature exceeds +130°C.
The MAX5052 has an internal bootstrap UVLO with
large hysteresis that requires a minimum voltage of
23.6V for startup. The MAX5053 does not have the
internal bootstrap UVLO and can be biased directly
from a minimum voltage of 10.8V.
The 262kHz switching frequency is internally trimmed to
±12% accuracy; this allows the optimization of the
magnetic and filter components resulting in compact,
cost-effective power supplies. The MAX5052A/
MAX5053A are offered with a 50% maximum duty-cycle
limit. The MAX5052B/MAX5053B are offered with a 75%
maximum duty-cycle limit. These devices are available
in 8-pin µMAX packages and operate over the -40°C to
+85°C temperature range.
Applications
Features
♦ Available in a Tiny 8-Pin µMAX Package
♦ Current-Mode Control
♦ 50W Output Power
♦ Universal Offline Input Voltage Range
Rectified 85VAC to 265VAC (MAX5052)
♦ VIN Directly Driven from 10.8V to 24V Input
(MAX5053)
♦ Digital Soft-Start
♦ Programmable Input Startup Voltage
♦ Internal Bootstrap UVLO with Large Hysteresis
(MAX5052)
♦ Internal Error Amplifier with 1% Accurate
Reference
♦ Thermal Shutdown
♦ 45µA (typ) Startup Supply Current
♦ 1.4mA (typ) Operating Supply Current
♦ Fixed Switching Frequency of 262kHz ±12%
♦ 50% Maximum Duty-Cycle Limit
(MAX5052A/MAX5053A)
♦ 75% Maximum Duty-Cycle Limit
(MAX5052B/MAX5053B)
♦ 60ns Cycle-by-Cycle Current-Limit Response Time
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3
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
________________________________________________________________ Maxim Integrated Products
Ordering Information
19-2590; Rev 0; 10/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Functional Diagram/Typical Operating Circuit/Selector
Guide appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX5052AEUA -40°C to +85°C 8 µMAX
MAX5052BEUA -40°C to +85°C 8 µMAX
MAX5053AEUA -40°C to +85°C 8 µMAX
MAX5053BEUA -40°C to +85°C 8 µMAX
NDRV
GNDCS
1
2
8
7
VIN
VCCFB
COMP
UVLO/EN
µMAX
TOP VIEW
3
4
6
5
MAX5052
MAX5053
Pin Configuration
Warning: The MAX5052/MAX5053 are designed to work with
high voltages. Exercise caution.
Universal Input AC
Power Supplies
Isolated Telecom Power
Supplies
Networking Systems
Computer Systems/
Servers
Industrial Power
Conversion
Isolated Keep-Alive
Circuits
12V Boost Regulators
12V SEPIC Regulators
EVALUAT
ION KIT
AVAILABL
E
Figure 5. MAX5052A EV Kit Schematic
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MAX5052A Evaluation Kit
_______________________________________________________________________________________
6
NDRV
8
VIN
MAX5052A
U1
1
3
UVLO/EN
COMP
2
FB
+VIN
FB_P
C17
OPEN
R4
42.2kΩ
1%
R3
1MΩ
1%
JU1
7
VCC
R10
0Ω
C8
OPEN
4
CS
IN
FB_PIN
D6D8 L2
L1
5
GND
R11
100Ω
C7
0.22µF
SHDN
NOTE: MOSFET N1 = IR IRF7464
-VIN
+VIN
C14
0.022µF
R9
14.3kΩ
1%
C9
2200pF
R2
2.49kΩ
1%
R1
22.6kΩ
1%
R5
0.170Ω
1%
1 2
3
4
4
5
8
10 12T D5
C5
47µF
25V
9T1
85
6 7
N1
C11
0.22µF
1
2
3
6
6T28T
35µH
D3
OPEN
15T
7
C12
0.22µF
D4
C3
68µF
6.3V
C15
1µF
C13
1µF
C4
22µF
6.3V SGND
VOUT1
SGND
VOUT2
C10
OPEN
R8
OPEN
R7
1.2kΩ
R12
1.2kΩ
D7
OPEN
C16
15µF
35V
R6
33kΩ
C1
1µF
100V
C2
1µF
100V
+VIN
D1
D2
C6
0.0047µF
250VAC
General Description
The MAX5014/MAX5015 integrate all the building
blocks necessary for implementing DC-DC fixed-fre-
quency isolated power supplies. These devices are
current-mode controllers with an integrated high-volt-
age startup circuit suitable for isolated telecom/industri-
al voltage range power supplies. Current-mode control
with leading-edge blanking simplifies control-loop
design and internal ramp compensation circuitry stabi-
lizes the current loop when operating at duty cycles
above 50% (MAX5014). The MAX5014 allows 85%
operating duty cycle and could be used to implement
flyback converters, whereas the MAX5015 limits the
operating duty cycle to less than 50% and can be used
in single-ended forward converters. A high-voltage
startup circuit allows these devices to draw power
directly from the 18V to 110V input supply during start-
up. The switching frequency is internally trimmed to
275kHz ±10%, thus reducing magnetics and filter com-
ponent costs.
The MAX5014/MAX5015 are available in 8-pin SO
packages. An evaluation kit (MAX5015EVKIT) is also
available.
Warning: The MAX5014/MAX5015 are designed to
operate with high voltages. Exercise caution.
Applications
Telecom Power Supplies
Industrial Power Supplies
Networking Power Supplies
Isolated Power Supplies
Features
♦ Wide Input Range: (18V to 110V) or (13V to 36V)
♦ Current-Mode Control
♦ Leading-Edge Blanking
♦ Internally Trimmed 275kHz ±10% Oscillator
♦ Low External Component Count
♦ Soft-Start
♦ High-Voltage Startup Circuit
♦ Pulse-by-Pulse Current Limiting
♦ Thermal Shutdown
♦ SO-8 Package
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Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
________________________________________________________________ Maxim Integrated Products
GND
CS
1
2
8
7
VCC
NDRVVDD
OPTO
V+
8-SO
TOP VIEW
3
4
6
5
MAX5014/
MAX5015
SS_SHDN
Pin Configuration
Ordering Information
MAX5015
VDD
V+
SS_SHDN
NDRV
CS
GND
VCC
OPTO
VIN VOUT
OPTOCOUPLER
Typical Operating Circuit
19-2082; Rev 0; 7/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUAT
ION KIT
AVAILABL
E
PART TEMP. RANGE PIN-PACKAGE
MAX5014CSA* 0°C to +70°C 8-SO
MAX5014ESA* -40°C to +85°C 8-SO
MAX5015CSA* 0°C to +70°C 8-SO
MAX5015ESA* -40°C to +85°C 8-SO
*See Selector Guide at end of data sheet.
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MAX5015 Evaluation Kit
_______________________________________________________________________________________
Figure 4. MAX5015 EV Kit Schematic
7
4
GND
CS
MAX5015
U1
NDRV
6
5
V+
VCC
VDD
OPTO
1
8
2
3
SS/SHDN
CS
VOUT
CS
N1
VOUT
SGND
C7
560µF
6.3V
C12
0.001µF
200V
C8
0.047µF
C6
0.68µF
C5
0.68µF
C4
0.68µF
R3
20Ω
R6
0.1Ω
1%
R1
OPEN
R8
499Ω
1%
R11
25.5kΩ
1%
R13
4.75kΩ
1%
R15
3.32kΩ
1%
R12
8.35kΩ
1%
R5
240kΩ
R10
SHORT
R9
150Ω
R16
51Ω
R17
51Ω
R7
1Ω
D1
OPEN
SHORT
COLLECTION TO EMITTER
L1
4.7µH
D5
VIN
VDD
D4
T1
3
32
1
Q1 4
5
6
1
11, 12 3
1
2
8, 9
1
2
2
3
D3
C2
0.01µF
C11
0.33µF
C1
0.1µFC910µF
C10
0.1µF
C17
0.022µF
C3
OPEN
VIN+
+SENSE
VIN-
VDD
VCC
C13
560µF
6.3V
C14
560µF
6.3V
C16
0.0047µF
250VAC
C15
0.1µF
SHDN
6
7
D2
OPEN
U2
U3
5
3
5
1
2
4
-SENSE
VIN
12T
5T
14T
5T
General Description
The MAX5003 high-voltage switching power-supply
controller has all the features and building blocks need-
ed for a cost-effective flyback and forward voltage-
mode control converter. This device can be used to
design both isolated and nonisolated power supplies
with multiple output voltages that operate from a wide
range of voltage sources. It includes a high-voltage
internal start-up circuit that operates from a wide 11V to
110V input range. The MAX5003 drives an external N-
channel power MOSFET and has a current-sense pin
that detects overcurrent conditions and turns off the
power switch when the current-limit threshold is
exceeded. The choice of external power MOSFET and
other external components determines output voltage
and power.
The MAX5003 offers some distinctive advantages: soft-
start, undervoltage lockout, external frequency synchro-
nization, and fast input voltage feed-forward. The
device is designed to operate at up to 300kHz switch-
ing frequency. This allows use of miniature magnetic
components and low-profile capacitors. Undervoltage
lockout, soft-start, switching frequency, maximum duty
cycle, and overcurrent protection limit are all adjustable
using a minimum number of external components. In
systems with multiple controllers, the MAX5003 can be
externally synchronized to operate from a common sys-
tem clock.
Warning: The MAX5003 is designed to operate with
high voltages. Exercise caution.
The MAX5003 is available in 16-pin SO and QSOP pack-
ages. An evaluation kit (MAX5003EVKIT) is also available.
Applications
Telecommunication Power Supplies
ISDN Power Supplies
+42V Automobile Systems
High-Voltage Power-Supply Modules
Industrial Power Supplies
Features
♦ Wide Input Range: 11V to 110V
♦ Internal High-Voltage Startup Circuit
♦ Externally Adjustable Settings
Output Switch Current Limit
Oscillator Frequency
Soft-Start
Undervoltage Lockout
Maximum Duty Cycle
♦ Low External Component Count
♦ External Frequency Synchronization
♦ Primary or Secondary Regulation
♦ Input Feed-Forward for Fast Line-Transient
Response
♦ Precision ±2.5% Reference over Rated
Temperature Range
♦ Thermal Shutdown
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High-Voltage PWM
Power-Supply Controller
________________________________________________________________ Maxim Integrated Products
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V+ VDD
VCC
NDRV
PGND
CS
AGND
MAXTON
FB
TOP VIEW
MAX5003
QSOP/Narrow SO
INDIV
ES
REF
FREQ
SS
CON
COMP
19-1555; Rev 2; 4/02
PART
MAX5003CEE
MAX5003CSE
MAX5003EEE -40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
16 QSOP
16 Narrow SO
16 QSOP
EVALUAT
ION KIT
AVAILABL
E
Note: Dice are designed to operate over a -40°C to +140°C junc-
tion temperature (Tj) range, but are tested and guaranteed at
TA = +25°C.
Pin Configuration
Ordering Information
MAX5003ESE -40°C to +85°C 16 Narrow SO
MAX5003C/D (Note A) Dice
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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MAX5003 Evaluation Kit
_______________________________________________________________________________________
M
AX
50
03
U1
1
1
1
1
13 12 11 10
9
CS
VI
ND
IV
V+
PG
ND
AG
ND
FB
62
CO
M
P
2
2
109 1211
2
1
1
2,
3
6,
78
6
7
5
2
2
V C
C
M
AX
TO
N
NO
T
IN
ST
AL
LE
D
CO
M
P
R6 51
kΩ
SW
2
R1
5
43
Ω
R1
6
24
.9
kΩ
1%
R2
17
.4
kΩ 1%
R9 0.
11
Ω
1/
4W
1%
R1
0
10
0Ω
R1
1
10
0k
Ω
R5 39
kΩ
R8 43
Ω
R2
0
68
0Ω
R1
41
.2
kΩ
1% R1
7
24
.9
kΩ
1%
R1
8
OP
EN
R1
9
OP
EN
R1
4
24
0k
Ω
U3
M
OC
21
7
R1
3
1.
3k
Ω
R4 1M
Ω
C1
2
39
0p
F
C6
39
00
pF
C7
0.
01
µF
C5
22
00
pF
R7
20
0k
Ω
R3 68
kΩ
R1
2
20
kΩ
R2
2
1M
Ω
14
ND
RV
15
D2
D1
JU
1
CU
T
HE
RE
+5
V
SW
1-
A
IS
O
GN
D
NO
N
T1
2
7 8
1
5
3
52
1
3
V D
D
VD
D
VD
D
16
ES
3
3
3
3
Q2
FR
EQ
RE
F
RE
F
RE
F
4
4
SS
5
RE
F
LV
L
DI
R
Q1
RE
F
NO
N
SW
1-
B
IS
O
6
CO
N
7 8
C1 33
µF
10
0V
C8 10
µF
16
V
VI
N
SH
DN
GN
D
(-4
8V
)
R2
3
1M
Ω
C9 10
0p
F C1
1
0.
1µ
F
C1
7
0.
1µ
F
C1
0
0.
47
µF
C1
3
0.
1µ
F
N1
C2 22
µF
10
V
C3 22
µF
10
V
R2
1
15
Ω
C1
6
4.
7µ
F
25
V
VD
D
U2 TL
43
1
Figure 1. MAX5003 EV Kit Schematic
General Description
The MAX5051 is a clamped, two-switch power-supply
controller IC. This device can be used both in forward
or flyback configurations with input voltage ranges from
11V to 76V. It provides comprehensive protection
mechanisms against possible faults, resulting in very
high reliability power supplies. When used in conjunction
with secondary-side synchronous rectification, power-
supply efficiencies can easily reach 92% for a +3.3V
output power supply operated from a 48V bus. The
integrated high- and low-side gate drivers provide more
than 2A of peak gate drive current to two external
N-channel MOSFETs. Low startup current reduces the
power loss across the bootstrap resistor. A feedforward
voltage-mode topology provides excellent line rejection
while avoiding the pitfalls of traditional current-mode
control.
The MAX5051 power-supply controller is primary as well
as secondary-side parallelable, allowing the design of
scaleableable power systems when necessary. When
paralleling the primary side, dedicated pins allow for
simultaneous wake-up or shutdown of all paralleled
units, thus avoiding any one unit current-hogging during
startup or fault conditions.
The MAX5051 generates a lookahead signal for driving
secondary-side synchronous MOSFETs. Special
primary-side synchronization inputs/outputs allow two
primaries to be operated 180° out of phase for
increased output power and lower input ripple currents.
The MAX5051 is available in a 28-pin TSSOP-EP
package and operates over a wide temperature range
of -40°C to +125°C.
Applications
High-Efficiency Isolated Telecom/Datacom
Power Supplies
48V and 12V Server Power Supplies
48V Power-Supply Modules
42V Automotive Power Systems
Industrial Power Supplies
Features
♦ Wide Input Voltage Range, 11V to 76V
♦ Voltage Mode With Input Voltage Feed-Forward
♦ Ripple-Phased Parallel Topology Compatible For
High Current/Power Output
♦ 2A Integrated High- and Low-Side MOSFET
Drivers
♦ SYNCIN And SYNCOUT Pins Enable 180° Out Of
Phase Operation
♦ Programmable Brownout and Bootstrap UVLOs
♦ High-Side Driver Bootstrap Capacitor Pre-Charge
Driver
♦ Low Current-Limit Threshold For High Efficiency
♦ Programmable Switching Frequency
♦ Reference Voltage Soft-Start For Startup Without
Overshoots
♦ Startup Synchronization With Multiple Paralleled
Primaries
♦ Programmable Integrating Current-Limit Fault
Protection
♦ Look-Ahead PWM Signal For Secondary-side
Synchronous Rectifier Drivers
♦ Look-Ahead Drivers For Either High-Speed
Optocouplers or Pulse Transformer
♦ Wide -40°C to +125°C Operating Range
♦ Thermally Enhanced 28-Pin TSSOP Package
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0
5
1
Parallelable, Clamped Two-Switch
Power-Supply Controller IC
________________________________________________________________ Maxim Integrated Products
Ordering Information
XX-XXXX; Rev 0; 4/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX5051AUI -40°C to +125°C 28-TSSOP-EP*
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
PR .2 Tboblet
04/15/03
M
A
X
5
0
5
1
Parallelable, Clamped Two-Switch
Power-Supply Controller IC
______________________________________________________________________________________
RE
G5
R2
1
24
.9
kΩ
1%
C1
10
0p
F
1
RC
OS
C
+V
IN
TP
1
R2
5
10
0k
Ω
C2
39
0p
F
3
RC
FF
5
CS
S
4
CO
M
6
CO
M
P
7
FB
8
RE
G5
2
SY
NC
OU
T
C5 47
00
pF
D8
2
1
R1
5
31
.6
kΩ
1%
R1
6
10
.5
kΩ
1%
C4
4.
7µ
F
RE
G5
RE
G5
9
RE
G9
C3
4.
7µ
F
RE
G9
10
PV
IN
C6
4.
7µ
F
PV
IN
11
ST
T
12
LX
VD
D
13
LX
H
C1
8
10
0p
F
R2
7
10
Ω
C1
9
1µ
F
LX
H
TP
3
14
LX
L
R3 2.
2k
Ω
R1
1
36
0Ω C1
7
0.
33
µF
C2
4
10
00
pF
4 3
1 2
U2
R2
0
0Ω R1
9
47
5Ω R1
2
10
0k
Ω
1%
C2
7
0.
15
µF
VO
UT
C3
6
0.
22
µF
C2
8
0.
04
7µ
F
R1
11
.5
kΩ 1%
R2 2.
55
kΩ
1%
VO
UT
R2
3
10
Ω
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