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Part Number: MAX5021
Description: The MAX5021/MAX5022 current-mode PWM controllers contain all the control circuitry required for the de...
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MAX5021
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DataSheet
General Description
MAX5021 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 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.
MAX5021 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.
MAX5021 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
· 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
MAX5021 Typical Application
·Universal Off-Line Power Supplies
·Standby Power Supplies
·Isolated Power Supplies
·Isolated Telecom Power Supplies
·Mobile Phone Chargers
·Standby Power Supplies
·Isolated Power Supplies
·Isolated Telecom Power Supplies
·Mobile Phone Chargers
MAX5021 Connection Diagram
MAX5021
PDF/DataSheet Download
- Datasheet: MAX5021
- File Size: 246635 KB
- Manufacturer: Maxim
- Click here to Download
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