HCPL316J datasheet(24/33 Pages) HP

24 / 33 page

Behavioral Circuit

Schematic

The functional behavior of the

HCPL-316J is represented by the

logic diagram in Figure 64 which

fully describes the interaction and

sequence of internal and external

signals in the HCPL-316J.

Input IC

In the normal switching mode, no

output fault has been detected,

and the low state of the fault

latch allows the input signals to

control the signal LED. The fault

output is in the open-collector

state, and the state of the Reset

pin does not affect the control of

the IGBT gate. When a fault is

detected, the FAULT output and

Figure 64. Behavioral Circuit Schematic.

signal input are both latched. The

fault output changes to an active

low state, and the signal LED is

forced off (output LOW). The

latched condition will persist until

the Reset pin is pulled low.

Output IC

Three internal signals control the

state of the driver output: the

state of the signal LED, as well as

the UVLO and Fault signals. If no

fault on the IGBT collector is

detected, and the supply voltage

is above the UVLO threshold, the

LED signal will control the driver

output state. The driver stage

logic includes an interlock to

ensure that the pull-up and pull-

down devices in the output stage

are never on at the same time. If

an undervoltage condition is

detected, the output will be

actively pulled low by the 50x

DMOS device, regardless of the

LED state. If an IGBT

desaturation fault is detected

while the signal LED is on, the

Fault signal will latch in the high

state. The triple darlington AND

the 50x DMOS device are

disabled, and a smaller 1x DMOS

pull-down device is activated to

slowly discharge the IGBT gate.

When the output drops below two

volts, the 50x DMOS device again

turns on, clamping the IGBT gate

firmly to Vee. The Fault signal

remains latched in the high state

until the signal LED turns off.

VIN+ (1)

VIN– (2)

VCC1 (3)

GND (4)

FAULT (6)

RESET (5)

DELAY

FAULT

LED

12 V

–

VCC2 (13)

7 V

–

DESAT (14)

VE (16)

250 µA

VC (12)

VOUT (11)

VEE (9,10)

50 x

1 x

UVLO

HCPL316J Datasheet(PDF) 24 Page - Agilent(Hewlett-Packard)

HCPL316J Datasheet(HTML) 24 Page - Agilent(Hewlett-Packard)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Datasheet Download

Link URL