Rainbow-electronics BA9736KV Manual do Utilizador descarregar pdf

432

Regulator ICs

6-channel switching regulator

controller

BA9736KV

The BA9736KV is a 6-channel controller that includes all of the circuits required to construct a switching regulator. The

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

tor, a pseudo-totem-pole driver, and a variety of protection circuits.

Applications

VCR / cameras, digital still cameras, and other portable

equipment

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.

2) Miss-operation prevention circuit for low-voltage input.

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

protection.

4) Channels 1 and 4 employ FETs, and have totem-pole

drivers that rectify synchronously with a chopper. The

duty offset of the chopper can be adjusted externally.

5) For channel control, by making STB low level, all

channels go off, and by making STB3 low level, chan-

nel 3 can be switched off independently.

6) Soft start is applied to all channels using an external

capacitor, and is synchronized with the rising edges

of STB and STB3.

7) VQFP64 package (0.5mm pitch).

Absolute maximum ratings (Ta = 25C)

Recommended operating conditions (Ta = 25C)

1 2 3 4 5 6 7 8 9 10

BA9736KV 1
Regulator ICs BA9736KV 10

Resumo do Conteúdo

Página 1 - BA9736KV

432Regulator ICs6-channel switching regulator controllerBA9736KVThe BA9736KV is a 6-channel controller that includes all of the circuits required to c

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441Regulator ICs BA9736KVOperation notes(1) Set the dead-time input voltage to 0.73V or more.(2) Use short and wide wiring tracks for the power sup-p

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433Regulator ICs BA9736KVBlock diagram

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434Regulator ICs BA9736KVPin descriptions

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435Regulator ICs BA9736KVElectrical characteristics (unless otherwise noted, Ta = 25C, VCC = 7.2V, fOSC = 700kHz and output voltage off)

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436Regulator ICs BA9736KV

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437Regulator ICs BA9736KVMeasurement circuits

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438Regulator ICs BA9736KV