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MAX5021 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX5021
Description  Current-Mode PWM Controllers for Isolated Power Supplies
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX5021 Datasheet(HTML) 1 Page - Maxim Integrated Products

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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
o Available in a Tiny 6-Pin SOT23 Package
o 50µA Typical Startup Current
o 1.2mA Typical Operating Current
o Large UVLO Hysteresis of 14V
o Fixed Switching Frequency of 262kHz ±12%
o 50% Maximum Duty Cycle Limit (MAX5021)
o 75% Maximum Duty Cycle Limit (MAX5022)
o 60ns Cycle-by-Cycle Current-Limit Response
Time
Current-Mode PWM Controllers for Isolated
Power Supplies
________________________________________________________________ Maxim Integrated Products
1
GND
VCC
NDRV
16
OPTO
5
VIN
CS
MAX5021
MAX5022
SOT23
TOP VIEW
2
34
NDRV
N.C.
N.C.
1
2
8
7
CS
GND
VIN
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
KIT 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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