Rainbow-electronics BA9737KV User Manual download pdf

412

Regulator ICs

4-channel switching regulator

controller

BA9737KV

The BA9737KV is a 4-channel controller that includes all of the circuits required to construct a switching regulator. The

circuits on the chip include a triangular-wave oscillator, a reference voltage circuit, an error amplifier, a PWM comparator,

a pseudo-totem-pole driver, and a short-circuit protection circuit.

Applications

Camcoders and digital still cameras etc.

Features

1) The totem-pole driver can directly drive power tran-

sistors, and the on current can be set to the rating cur-

rent using an external resistor.

For the off current, the peak current can be set using

an external capacitor.

2) Output cutoff circuit (timer latch type) for overload

protection.

3) Channels 2 and 3 are supplied using the internal ref-

erence voltage, and use a positive voltage only.

Channels 1 and 4 are general-purpose channels,

and all inputs are externally available.

4) Channels can be switched off individually or all to-

gether (STB and STB1 to STB4).

5) Dead-time control is provided for all channels, and

duty limits can be used.

Absolute maximum ratings (Ta = 25C)

Recommended operating conditions (Ta = 25C)

1 2 3 4 5

BA9737KV 1
Regulator ICs BA9737KV 2

Summary of Contents

Page 1 - BA9737KV

412Regulator ICs4-channel switching regulator controllerBA9737KVThe BA9737KV is a 4-channel controller that includes all of the circuits required to c

Page 2 - Regulator ICs BA9737KV

413Regulator ICs BA9737KVBlock diagram

Page 3

414Regulator ICs BA9737KVPin assignmentsPin descriptions

Page 4

415Regulator ICs BA9737KVElectrical characteristics (unless otherwise noted, Ta = 25C, VCC = 6.0V, fosc = 0.45MHz, STB, STB1 to STB4 = 5V)

Page 5

416Regulator ICs BA9737KVOperation notes(1) Use short and wide wiring tracks for the power sup-ply and ground to keep the mutual impedance as smallas

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Rainbow-electronics BA9737KV User Manual

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