The MAX5003 high-voltage switching power-supply controller has all the features and building blocks needed for a cost-effective flyback and forward voltage-mode control converter. This device can be used to design both isolated and nonisolated power supplies with multiple output voltages that operate from a wide range of voltage sources. It includes a high-voltage internal start-up circuit that operates from a wide 11V to 110V input range. The MAX5003 drives an external N-channel power MOSFET and has a current-sense pin that detects overcurrent conditions and turns off the power switch when the current-limit threshold is exceeded. The choice of external power MOSFET and other external components determines output voltage and power. The MAX5003 offers some distinctive advantages: soft-start, undervoltage lockout, external frequency synchronization, and fast input voltage feed-forward. The device is designed to operate at up to 300kHz switching frequency. This allows use of miniature magnetic components and low-profile capacitors. Undervoltage lockout, soft-start, switching frequency, maximum duty cycle, and overcurrent protection limit are all adjustable using a minimum number of external components. In systems with multiple controllers, the MAX5003 can be externally synchronized to operate.
The MAX5003 high‑voltage PWM power‑supply controller provides all the building blocks needed for cost‑effective flyback and forward voltage‑mode converters. It supports both isolated and non‑isolated designs, multiple output voltages, and can be synchronized with other controllers via an external clock.
The device operates from a wide 11 V to 110 V input range, features soft‑start, undervoltage lockout, and programmable maximum duty cycle. It is offered in 16‑pin SO and QSOP packages and is supported by an evaluation kit (MAX5003EVKIT).
| Input Voltage Range | 11 V to 110 V |
|---|---|
| Maximum Duty Cycle | 75 % |
| Package Options | 16‑pin SO and QSOP |
The controller accepts an input voltage from 11 V up to 110 V.
The maximum programmable duty cycle is limited to 75 %.
It is offered in 16‑pin SO and QSOP packages.