Maxim MAX5022EVKIT Current-mode pwm controllers for isolated power supply Datasheet

19-2066; Rev 1; 9/01
ABLE
KIT AVAIL
N
IO
T
A
U
L
EVA
Current-Mode PWM Controllers for Isolated
Power Supplies
Features
♦ Available in a Tiny 6-Pin SOT23 Package
An undervoltage lockout (UVLO) circuit with large hysteresis 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-effective power supplies. The MAX5021 with 50% maximum
duty cycle and MAX5022 with 75% maximum duty
cycle are recommended for forward converters and flyback 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.
♦ Fixed Switching Frequency of 262kHz ±12%
♦ 50µA Typical Startup Current
♦ 1.2mA Typical Operating Current
♦ Large UVLO Hysteresis of 14V
♦ 50% Maximum Duty Cycle Limit (MAX5021)
♦ 75% Maximum Duty Cycle Limit (MAX5022)
♦ 60ns Cycle-by-Cycle Current-Limit Response
Time
Ordering Information
PART
MAX
DUTY
CYCLE
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
Standby Power Supplies
MAX5022EUT
75%
-40°C to +85°C 6 SOT23-6
Isolated Power Supplies
MAX5022EUA
75%
-40°C to +85°C 8 µMAX
—
Isolated Telecom Power Supplies
MAX5022EPA
75%
-40°C to +85°C 8 PDIP
—
Applications
Universal Off-Line Power Supplies
Mobile Phone Chargers
TEMP.
RANGE
PINTOP
PACKAGE MARK
—
—
AASR
WARNING: The MAX5021/MAX5022 are designed to work
with high voltages. Exercise caution!
Pin Configuration
Typical Operating Circuit
VSUPPLY
VOUT
TOP VIEW
CS 1
GND 2
VCC
VIN
MAX5021
MAX5022
OPTO
NDRV
MAX5021
MAX5022
NDRV 3
SOT23
GND
6
OPTO OPTO 1
5
VIN
4
VCC
VIN 2
VCC
3
MAX5021
MAX5022
N.C. 4
8
CS
7
GND
6
NDRV
5
N.C.
PDIP/µMAX
CS
________________________________________________________________ Maxim Integrated Products
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.
1
MAX5021/MAX5022
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.
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
ABSOLUTE MAXIMUM RATINGS
VIN to GND .............................................................-0.3V to +30V
VCC to GND ............................................................-0.3V to +13V
NDRV to GND.............................................-0.3V to (VCC + 0.3V)
CS, OPTO to GND ....................................................-0.3V to +6V
NDRV Short-Circuit to GND........................................Continuous
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin PDIP (derate 9.1mW/°C above +70°C)................727mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering 10s) ..................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA = -40°C to
+85°C, unless otherwise noted. Typical values are at VIN = +12V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
UNDERVOLTAGE LOCKOUT/STARTUP
Undervoltage Lockout Wakeup
Level
VUVR
VIN rising
22
24
26
V
Undervoltage Lockout Shutdown
Level
VUVF
VIN falling
9.3
10
10.9
V
50
85
µA
28
V
VIN Supply Current at Startup
VIN Range
Undervoltage Lockout
Propagation Delay
ISTART
VIN = +22V
VIN
11
TUVR
VIN steps up from +9V to +26V
5
TUVF
VIN steps down from +26V to +9V
1
µs
INTERNAL SUPPLY
VCC Regulator Set Point
VIN Supply Current after Startup
VCCSP
IIN
VIN = +11V to +28V, sourcing 1µA to 5mA
from VCC
7.0
10.5
VIN = +28V, OPTO connected to GND
0.9
2.43
VIN = +28V, OPTO unconnected (Note 2)
0.4
V
mA
GATE DRIVER
Driver Output Impedance
Driver Peak Sink Current
Driver Peak Source Current
RON(LOW)
Measured at NDRV sinking 5mA
RON(HIGH) Measured at NDRV sourcing 5mA
10
20
20
40
Ω
ISINK
250
mA
ISOURCE
150
mA
PWM COMPARATOR
Comparator Offset Voltage
CS Input Bias Current
Propagation Delay from
Comparator Input to NDRV
Minimum On-Time
VOPWM
VOPTO - VCS
ICS
TPWM
600
750
-2
25mV overdrive
TON(MIN)
900
mV
+2
µA
60
ns
150
ns
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold
VCS
Current-Limit Propagation Delay
from Comparator Input to NDRV
TCL
2
540
25mV overdrive
600
60
_______________________________________________________________________________________
660
mV
ns
Current-Mode PWM Controllers for Isolated
Power Supplies
(VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA = -40°C to
+85°C, unless otherwise noted. Typical values are at VIN = +12V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
230
kHz
OSCILLATOR
Switching Frequency
fSW
Maximum Duty Cycle
DMAX
262
290
MAX5021
50
51
MAX5022
75
76
5.5
V
6.2
7.9
kΩ
%
OPTO INPUT
OPTO Pullup Voltage
VOPTO
OPTO Pullup Resistance
ROPTO
OPTO sourcing 10µA
4.5
Note 1: All devices are 100% tested at TA = +25°C. All limits over temperature are guaranteed by characterization.
Note 2: This minimum current after startup is a safeguard that prevents the VIN pin voltage from rising in the event
that OPTO and NDRV become unconnected.
Typical Operating Characteristics
(VIN = 15V, TA = +25°C, unless otherwise noted.)
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
24.1
24.0
VIN FALLING
10.1
10.0
9.9
53
52
MAX5021/22 toc03
24.2
10.2
MAX5021/22 toc02
UNDERVOLTAGE LOCKOUT (V)
VIN RISING
UNDERVOLTAGE LOCKOUT (V)
MAX5021/22 toc01
24.3
STARTUP CURRENT
vs. TEMPERATURE
STARTUP CURRENT (µA)
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
VIN = 23.0V
51
50
49
48
23.9
9.8
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
47
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
_______________________________________________________________________________________
3
MAX5021/MAX5022
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics (continued)
(VIN = 15V, TA = +25°C, unless otherwise noted.)
1.45
9.06
VIN = 28.0V
VCS = 0
OPTO = UNCONNECTED
9.03
1.40
40
60
80
7.70
-40
-20
TEMPERATURE (°C)
40
60
80
-40
MEAN
600
-3σ
15
10
0
570
20
40
60
540
80
560
270
+3σ
265
MEAN
255
-3σ
580
600
620
640
245
660
-40
-20
CURRENT SENSE DELAY
vs. TEMPERATURE
10
5
MAX5021/22 toc11
70
65
60
55
0
50
280
OSCILLATOR FREQUENCY (kHz)
4
40
60
80
290
6
UNDERVOLTAGE LOCKOUT DELAY (µs)
15
270
20
UNDERVOLTAGE LOCKOUT
DELAY vs. TEMPERATURE
75
CURRENT SENSE DELAY (ns)
20
MAX5021/22 toc10
TOTAL NUMBER
OF DEVICES = 200
260
0
TEMPERATURE (°C)
25
250
80
260
CURRENT SENSE THRESHOLD (mV)
OSCILLATOR FREQUENCY
240
60
TOTAL NUMBER
OF DEVICES = 50
275
TEMPERATURE (°C)
230
40
250
TOTAL NUMBER OF
DEVICES = 50
0
20
280
5
-20
0
OSCILLATOR FREQUENCY
vs. TEMPERATURE
TOTAL NUMBER
OF DEVICES = 200
20
FREQUENCY (%)
+3σ
580
-20
TEMPERATURE (°C)
25
MAX5021/22 toc07
CURRENT SENSE THRESHOLD (mV)
630
-40
20
CURRENT SENSE
THRESHOLD
640
610
0
TEMPERATURE (°C)
CURRENT SENSE THRESHOLD
vs. TEMPERATURE
620
7.90
MAX5021/22 toc12
20
OSCILLATOR FREQUENCY (kHz)
0
MAX5021/22 toc08
-20
8.00
7.80
9.00
-40
8.10
MAX5021/22 toc09
1.50
9.09
VIN = 10.8V
5mA LOAD ON VCC
VCS = 0
OPTO = UNCONNECTED
8.20
MINIMUM VCC (V)
9.12
MAXIMUM VCC (V)
1.55
8.30
MAX5021/22 toc05
VIN = 28.0V
VOPTO = VCS = 0
SUPPLY CURRENT (mA)
9.15
MAX5021/22 toc04
1.60
590
MINIMUM VCC
vs. TEMPERATURE
MAXIMUM VCC
vs. TEMPERATURE
MAX5021/22 toc06
SUPPLY CURRENT
vs. TEMPERATURE
FREQUENCY (%)
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
5
VIN RISING
4
3
2
VIN FALLING
1
0
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
-40
-20
0
20
40
TEMPERATURE (°C)
_______________________________________________________________________________________
60
80
Current-Mode PWM Controllers for Isolated
Power Supplies
PIN
SOT23
PDIP
µMAX
NAME
1
8
CS
FUNCTION
Current Sense Connection for PWM Regulation and Overcurrent Protection. The current-limit
comparator threshold is internally set to 0.6V.
2
7
GND
Power-Supply Ground
3
6
NDRV
External N-Channel MOSFET Gate Connection
4
3
VCC
Gate Drive Supply. Internally regulated down from VIN. Decouple with a 10nF or larger
capacitor to GND.
5
2
VIN
IC Supply. Decouple with a 10nF or larger capacitor to GND. Connect a startup resistor
(Rs) from the input supply line to VIN. Connect to bias winding through diode rectifier.
See Typical Operating Circuit.
6
1
OPTO
—
4, 5
N.C.
Optocoupler Transistor Collector Connection. Connect emitter of optocoupler to GND.
The OPTO has an internal pullup resistor with a typical value of 6.2kΩ.
No Connection. Do not make connections to these pins.
Detailed Description
The MAX5021/MAX5022 are current-mode PWM controllers that have been specifically designed for use in
isolated power supplies. An undervoltage lockout circuit (UVLO) with a large hysteresis (14V) along with
very low startup and operating current result in highefficiency, universal input power supplies. Both devices
can be used in power supplies capable of operating
from a universal 85VAC to 265VAC line or the telecom
voltage range of -36VDC to -72VDC.
Power supplies designed with these devices use a
high-value startup resistor, RS, (series combination of
R1 and R2) that charges a reservoir capacitor, C2 (see
Figure 1). During this initial period while the voltage is
less than the UVLO start threshold, the IC typically consumes only 50µA of quiescent current. This low startup
current and the large UVLO hysteresis combined with
the use of a ceramic capacitor C2 keeps the power dissipation in RS to less than 1/4W even at the high end of
the universal AC input voltage (265VAC).
The MAX5021/MAX5022 include a cycle-by-cycle current limit which turns off the gate drive to the external
MOSFET during an overcurrent condition. If the output
on the secondary side of transformer T1 is shorted, the
tertiary winding voltage will drop below the 10V threshold causing the UVLO circuit to turn off the gate drive to
the external power MOSFET, thus re-initiating the startup sequence.
Startup
Figure 2 shows the voltages on VIN and VCC during
startup. Initially, both VIN and VCC are 0V. After the line
voltage is applied, C2 charges through the startup
resistor, RS, to an intermediate voltage at which point
the internal reference and regulator begin charging C3
(see Figure 1). The bias current consumed by the
device during this period is only 50µA; the remaining
input current charges C2 and C3. Charging of C3 stops
when the V CC voltage reaches approximately 9.5V,
while the voltage across C2 continues rising until it
reaches the wakeup level of 24V. Once VIN exceeds
the UVLO threshold, NDRV begins switching the
MOSFET, transferring energy to the secondary and tertiary outputs. If the voltage on the tertiary output builds
to higher than 10V (UVLO lower threshold), then startup
has been accomplished and sustained operation
will commence.
If VIN drops below 10V before startup is complete, then
the IC goes back into UVLO. In this case, increase the
value of C2 and/or use a MOSFET with a lower gatecharge requirement.
Startup Time Considerations
The VIN bypass capacitor C2 supplies current immediately after wakeup. The size of C2 will determine the number
of cycles available for startup. Large values for C2 will
increase the startup time, but will also supply more gate
charge, allowing for more cycles after wakeup. If the
value of C2 is too small, VIN will drop below 10V because
_______________________________________________________________________________________
5
MAX5021/MAX5022
Pin Description
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
L
CENTRAL SEMICONDUCTOR
CBR1-D100S
AC
L2
470µH
85VAC TO
N
265VAC IN
G
C1
10µF
400V
AC
R8
1.2kΩ
R1
360kΩ
D1
RS = R1 + R2
C9
10µF
400V
R2
360kΩ
D1
250mA, 75V
CENTRAL SEMICONDUCTOR
CMPD914
C3
0.22µF
3T
8T
R11
10Ω
C4
150µF
6.3V
+5V OUT
VCC
R10
10Ω
C7
1000pF
OPTO
C5
0.01µF
TEXAS
INSTRUMENTS
TLV431AIDBV
VIN
U1
C6
0.1µF
R4
24.9kΩ
1%
R3
1kΩ
1%
OPTO
C2
0.22µF
MAX5022
OPTO
FAIRCHILD
CNY17-3
D2
CTX03-15256
3A, 40V
T1
ON SEMICONDUCTOR
MBRS340T3
480µH, 60T
R5
8.06kΩ
1%
N1
INTERNATIONAL RECTIFIER
IRFRC20
NDRV
NOTE: ALL RESISTORS ARE 5% UNLESS OTHERWISE SPECIFIED.
CS
GND
R9
240kΩ
C8
8200pF
R6
10Ω
RCS
1.78Ω
1%
Figure 1. Universal 5W Off-Line Standby Power Supply
6
25
IC COMES OUT OF UVLO
(WAKEUP)
20
VIN, VCC (V)
NDRV did not switch enough times to build up sufficient
voltage across the tertiary output to power the device.
The device will go back into UVLO and will not start. Use
a low-leakage ceramic or film capacitor for C2 and C3.
As a rule of thumb, off-line power supplies keep typical
startup times to less than 500ms even in low-line conditions (85VAC input). Size the startup resistor, RS, to supply the maximum startup bias of the IC (85µA) plus the
additional current required for charging the capacitors
C2 and C3 in less than 500ms. This resistor dissipates
continuous power in normal operation, despite the fact
that it is only used during the startup sequence.
Therefore it must be chosen to provide enough current
for the low-line condition as well as have an appropriate
power rating for the high-line condition (265VAC). In
most cases, split the value into two resistors connected
in series for the required voltage of approximately
400VDC.
The typical value for C2 and C3 is 220nF. The startup
resistor, RS, provides both the maximum quiescent current of 85µA and the charging current for C2 and C3.
Bypass capacitor C3 charges to 9.5V and C2 charges
VIN SUPPLIED BY C2
15
VIN
10
VIN SUPPLIED BY TERTIARY
WINDING (NORMAL OPERATION)
VCC BYPASS CAPACITOR
FULLY CHARGED
5
VCC
VCC DROPS SLIGHTLY WHEN
NDRV BEGINS SWITCHING
0
0
50
100
TIME (ms)
150
200
Figure 2. VIN and VCC During Startup
to 24V all within the desired time period of 500ms, for
an overall average charging current of 15µA. Hence,
the startup resistor must provide a total of at least
100µA. Developing 100µA from an input voltage of
_______________________________________________________________________________________
Current-Mode PWM Controllers for Isolated
Power Supplies
Undervoltage Lockout (UVLO)
The device will attempt to start when VIN exceeds the
UVLO threshold of 24V. During startup, the UVLO circuit keeps the CPWM comparator, ILIM comparator,
oscillator, and output driver shut down to reduce current consumption (Functional Diagram). Once V IN
reaches 24V, the UVLO circuit turns on both the CPWM
and ILIM comparators, as well as the oscillator, and
allows the output driver to switch. If VIN drops below
10V, the UVLO circuit will shut down the CPWM comparator, ILIM comparator, oscillator, and output driver
returning the MAX5021/MAX5022 to the startup mode.
N-Channel MOSFET Switch Driver
The NDRV pin drives an external N-channel MOSFET.
The NDRV output is supplied by the internal regulator
(VCC), which is internally set to approximately 9V. For
the universal input voltage range, the MOSFET used
must be able to withstand the DC level of the high-line
input voltage plus the reflected voltage at the primary
of the transformer. For most applications that use the
discontinuous flyback topology, this requires a MOSFET rated at 600V. NDRV can source/sink 150mA/
250mA peak current, thus select a MOSFET that will
yield acceptable conduction and switching losses.
Internal Oscillator
The internal oscillator switches at 1.048MHz and is
divided down to 262kHz by two D flip-flops. The
MAX5021 inverts the Q output of the last D flip-flop to
provide a duty cycle of 50% (Figure 3). The MAX5022
performs a logic NAND operation on the Q outputs of
both D flip-flops to provide a duty cycle of 75%.
D
OSCILLATOR
1.048MHz
Q
D
Q
Q
Q
Figure 3. Internal Oscillator
262kHz WITH 50%
(MAX5021)
262kHz WITH 75%
(MAX5022)
Optocoupler Feedback
The MAX5021/MAX5022 do not include an internal error
amplifier and are recommended for use in optocoupler
feedback power supplies. Isolated voltage feedback is
achieved by using an optocoupler and a shunt regulator as shown in the Typical Operating Circuit. The output voltage set point accuracy is a function of the
accuracy of the shunt regulator and resistor divider.
When a TLV431 shunt regulator is used for output voltage regulation, the output voltage is set by the ratio of
R4 and R5 (Figure 1). Output voltage is given by the
following equation:
R4 

VOUT = VREF × 1 +


R5 
where VREF = 1.24V for the TLV431.
During normal operation, the optocoupler feedback pin
(OPTO) is pulled up through a 6.2kΩ resistor to the
internal supply voltage of 5.25V. When the device is in
UVLO, OPTO is disconnected from the 5.25V regulator
and connected to ground (Functional Diagram). This
helps initial startup by reducing the current consumption of the device.
Current Limit
The current limit is set by a current sense resistor, RCS,
connected between the source of the MOSFET and
ground. The CS input has a voltage trip level (VCS) of
600mV. Use the following equation to calculate the
value of RCS:
V
RCS = CS
IPRI
where IPRI is the peak current in the primary that flows
through the MOSFET. When the voltage produced by
this current through the current sense resistor exceeds
the current-limit comparator threshold, the MOSFET driver (NDRV) will quickly terminate the current ON-cycle,
typically within 60ns. In most cases a small RC filter will
be required to filter out the leading-edge spike on the
sense waveform. Set the corner frequency at a
few MHz.
Applications Information
Universal Off-Line Power Supply
Figure 1 shows the design of a 5V/1A isolated power
supply capable of operating from a line voltage of
85VAC to 265VAC. This circuit is implemented in the
MAX5022EVKIT.
_______________________________________________________________________________________
7
MAX5021/MAX5022
85VAC (corresponding to 120VDC) to the 24V wakeup
level results in a resistor value of about 1MΩ. If we
assume RS values between 750kΩ and 1MΩ, then at
the high-line voltage of 265VAC (corresponding to
374VDC) power dissipation will be between 140mW to
190mW. A single 1/4W resistor or a series combination
of two 1/4W resistors is adequate.
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
T1
VOUT
RS
C2
VIN
VCC
C3
MAX5022
OPTO
GND
NDRV
CS
-36VDC TO -72VDC IN
Figure 4. -48VDC Input to +5V Output
WARNING! DANGEROUS AND LETHAL VOLTAGES
ARE PRESENT IN OFF-LINE CIRCUITS! USE
EXTREME CAUTION IN THE CONSTRUCTION,
TESTING, AND USE OF OFF-LINE CIRCUITS.
Isolated Telecom Power Supply
Figure 4 shows a -48VDC telecom power supply capable of generating an isolated +5V output.
To achieve best performance, a star ground connection
is recommended to avoid ground loops. For example,
the ground returns for the power-line input filter, power
MOSFET switch, and sense resistor should be routed
separately through wide copper traces to meet at a single system ground connection.
Layout Recommendations
All printed circuit board traces carrying switching currents must be kept as short as possible, and the current loops they form must be minimized. The pins of the
SOT23 package have been placed to allow simple
interfacing to the external MOSFET. The order of these
pins directly corresponds to the order of a TO-220 or
similar package MOSFET.
For universal AC input design all applicable safety regulations must be followed. Off-line power supplies may
require UL, VDE, and other similar agency approvals.
These agencies can be contacted for the latest layout
and component rules.
Chip Information
TRANSISTOR COUNT: 519
PROCESS: BiCMOS
Typically there are two sources of noise emission in a
switching power supply: high di/dt loops and high dv/dt
surfaces. For example, traces that carry the drain current often form high di/dt loops. Similarly the heatsink of
the MOSFET presents a dv/dt source, thus the surface
area of the heatsink must be minimized as much
as possible.
8
_______________________________________________________________________________________
Current-Mode PWM Controllers for Isolated
Power Supplies
IN
VIN
VCC
VCC
REGULATOR
REG_OK
UVLO
IN
REFERENCE
1.25V
24V
10V
GND
VL
(INTERNAL 5.25V
SUPPLY)
6.2kΩ
DRIVER
S
Q
NDRV
R
OPTO
CPWM
0.75V
OSCILLATOR
262kHz*
CS
GND
VOPWM
VCS
0.6V
*MAX5021: 50% MAXIMUM DUTY CYCLE
MAX5022: 75% MAXIMUM DUTY CYCLE
ILIM
_______________________________________________________________________________________
9
MAX5021/MAX5022
Functional Diagram
Current-Mode PWM Controllers for Isolated
Power Supplies
6LSOT.EPS
MAX5021/MAX5022
Package Information
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0036
10
REV.
J
1
1
______________________________________________________________________________________
Current-Mode PWM Controllers for Isolated
Power Supplies
PDIPN.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX5021/MAX5022
Package Information (continued)
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