DESCRIPTION

SiP11205 is a feed-forward controller for the primary side of a half-bridge intermediate bus converter (IBC). It is ideally suited for isolated applications such as telecom, data communications and other products requiring an IBC architecture and conversion of standard bus voltages such as 48 V to a lower intermediate voltage, where high efficiency is required at low output voltages (24 V, 12 V, 9 V or 5 V).

Designed to operate within the telecom voltage range of 36 V to 75 V and withstand 100 V transients for a period of 100 ms, the IC is designed for controlling and driving both the low- and high-side switching devices of a half-bridge converter.

FEATURES

• 36 V to 75 V input voltage range

• Withstand 100 V, 100 ms transient capability

• Integrated ± 1.6 A typical high- and low-side MOSFET drivers

• Oscillator frequency is programmable from 200 kHz to 1 MHz (100 kHz to 500 kHz switching frequency) and can be externally synchronized

• Voltage feed-forward compensation

• High voltage pre-regulatoroperates during start-up

• Current sensing on primary low-side switch

• Hiccup mode

• System low input voltage detection

• Chip UVLO function

• Programmable soft-start function

• Over temperature protection (160 °C)

• Greater than 95.5 % efficiency for 42 V to 55 V input range

• Better than 2 % line regulation at 9 A



APPLICATIONS

• Intermediate bus architectures

• Telecom and Datacom

• Routers and servers

• Storage area network

• Base station

• 1/8 and 1/4 bricks