CS3706 datasheet(4/6 Pages) CHERRY

номер детали	CS3706

подробное описание детали	Dual Output Driver

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производитель	CHERRY [Cherry Semiconductor Corporation]

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Outputs

The totem-pole outputs have been designed to minimize

cross-conduction current spikes while maximizing fast,

high-current rise and fall times. Current limiting can be

done externally either at the outputs or at the common

VCC pin. The output diodes included have slow recovery

and should be shunted with high-speed external diodes

when driving high-frequency inductive loads.

Flip/Flop

Grounding F/F Enable activates the internal flip-flop to

alternate the two outputs. With pin open, the two outputs

operate simultaneously and can be paralleled for higher

current operation. Since the flip-flop is triggered by the

digital input, an off-time of at least 200nsec. must be pro-

vided to allow the flip/flop to change states. Note that the

circuit logic is configured such that the ÒOFFÓ state is

defined as the outputs low.

Digital Inputs

With both an inverting and non-inverting input available,

either active-high or active-low signals may be accepted.

These are true TTL compatible inputsÐthe threshold is

approximately 1.2V with no hysteresis; and external pull-

up resistors are not required.

Inhibit Circuit

Although it may have other uses, this circuit is included to

eliminate the need for deadband control when driving rel-

atively slow bipolar power transistors. A diode from each

inhibit input to the opposite power switch collector will

keep one output from turning on until the other has

turned-off. The threshold is determined by the voltage on

INHIBIT REF which can be set from 0.5 to 3.5 V. When this

circuit is not used, ground INHIBIT REF and leave INHIB-

IT A&B open.

Analog Shutdown

This circuit is included to get a latched shutdown as close

to the outputs as possible, from a time standpoint. With an

internal 130mV threshold, this comparator has a common-

mode range from ground to (VIN - 3V). When not used,

both inputs should be grounded. The time required for

this circuit to latch is inversely proportional to the amount

of overdrive but reaches a minimum of 180nsec. As with

the flip-flop, an input off-time of at least 200nsec is

required to reset the latch between pulses.

Supply Voltage

With an internal 5V regulator, this circuit is optimized for

use with a 7 to 40V supply, however, with some slight

response time degradation, it can also be driven from 5V.

When VIN is low, the entire circuit is disabled and no cur-

rent is drawn from VCC. When combined with a CS384X

PWM, the Driver Bias switch can be used to supply VIN to

the CS3706. VIN switching should be fast as undefined

operation of the outputs may occur with VIN less than 5V.

Thermal Considerations

Should the chip temperature reach approximately 155ûC, a

parallel, non-inverting input is activated driving both out-

puts to the low state.

Circuit Description

INV.

N.I.

OUT

HH

L

LH

H

HL

L

LL

L

Truth Table

OUT = INV and N.I.

OUT = INV or N.I.

Аналогичный номер детали - CS3706

производитель	номер детали	датащи	подробное описание детали
ON Semiconductor	CS3706	58Kb / 8P	Dual Output Driver December, 2001 - Rev. 2
ON Semiconductor	CS3706GNF16	58Kb / 8P	Dual Output Driver December, 2001 - Rev. 2

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