ISL97645(2006) Просмотр технического описания (PDF) - Intersil

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ISL97645
(Rev.:2006)

Boost + VON Slice + VCOM

Intersil 

ISL97645

Gate Pulse Modulator Circuit

The gate pulse modulator circuit functions as a three way

multiplexer, switching VGHM between ground, VDD1 and

VGH. Voltage selection is provided by digital inputs VDPM

(enable) and VFLK (control). High to low delay and slew

control is provided by external components on pins CE and

RE, respectively. A block diagram of the gate pulse

modulator circuit is shown in Figure 14.

When VDPM is LOW, the block is disabled and VGHM is

grounded. When VDPM is HIGH, the output is determined

by VFLK. When VFLK goes high, VGHM is pulled to VGH by

a 70Ω switch. When VFLK goes low, there is a delay

controlled by capacitor CE, following which VGHM is driven

to VDD1, with a slew rate controlled by resistor RE. Note

that VDD1 is used only as a reference voltage for an

amplifier, thus does not have to source or sink a significant

DC current.

VGH_M

FIGURE 14. GATE PULSE MODULATOR CIRCUIT BLOCK DIAGRAM

11

FN9263.0

April 11, 2006

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