Vishay – Low-power current-mode controllers support switching frequencies up to 1MHz

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SiP280x: Low start-up and operating current

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The SiP280x family of low-power current-mode controllers from Vishay Siliconix offers flexibility in cost- sensitive power-supply designs.

These PWM controllers serve as low-cost building blocks for a broad variety of converters in both offline and DC-DC current-mode switching power supplies.

The SiP2800, SiP2801, SiP2802, SiP2803, SiP2804 and SiP2805 are built on a BiCMOS process, and are available in an SOIC-8 package. Suitable for use in power supplies rated for outputs ranging from 10W to 250W, the new controllers can operate from a supply voltage as low as 5V.

The devices’ low start-up current of 100μA substantially reduces dissipation in any dropping resistors required for start-up, while the low operating current of 500μA also allows the SiP280x devices to use small external capacitors between the supply-voltage pin and ground.

Operating at frequencies up to 1MHz, the SiP280x controllers also enable designers to implement power-supply circuits that use small power inductors.

FEATURES

  • Internal soft-start circuit
  • Built-in leading-edge blanking on Current Sense pin
  • Over-current protection
  • Under-voltage lock-out
  • Operating-temperature range: -40°C to 85°C

APPLICATIONS

  • Industrial equipment
  • Telecoms and network equipment
  • PoL regulators
  • DC-DC converter modules
  • AC-DC power supplies

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