110V PWM POWER-SUPPLY CONTROLLER INTEGRATES HIGH-VOLTAGE STARTUP FET
SUNNYVALE, CA-November 4, 1999-Maxim Integrated Products introduces the MAX5003 high-voltage PWM DC-DC controller. This device is specifically optimized to meet the stringent demands placed on fixed telecom and data communications power supplies. It is designed for use in an isolated or nonisolated flyback or forward voltage-mode DC-DC converter.
The MAX5003 includes an internal 110V start-up transistor and preregulator circuitry that improves efficiency, reduces system cost, and allows more compact power-supply designs over comparable solutions requiring additional external components. The device is capable of up to 300kHz switching frequency and can use low-value ceramic output capacitors; these are attributes that allow use of a low-profile transformer and small-footprint surface-mount capacitors. The MAX5003 features a wide 11V to 110V input voltage range, ±2.5% VREF accuracy over the operating temperature range, and only 2.2mA supply current. The device's input feed-forward compensation circuitry allows fast line-transient response.
The MAX5003 offers maximum design flexibility to systems designers. Features such as current limit, oscillator frequency, maximum duty cycle, undervoltage lockout, and soft-start are programmable with a minimum number of external components. The MAX5003 can also be externally synchronized to operate from a common system clock.
The MAX5003 is available in 16-pin QSOP or narrow SO packages for operation over the commercial or extended-industrial temperature range. Prices start from $1.79 (1000-up, FOB USA).
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