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MAX5053 Current Mode PWM Controller With Error Amplifier For Isolated/Non-Isolated Power Supplies

Maxim-Dallas

MAX5053 Current Mode PWM Controller With Error Amplifier For Isolated/Non-Isolated Power Supplies RSS Sample
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Maxim Integrated
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Create a design and simulate using EE-Sim® tools: 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 amplifier 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 programmable 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.

* 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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