KA3162 Просмотр технического описания (PDF) - Fairchild Semiconductor

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KA3162

Single IGBT Gate Driver

Fairchild Semiconductor 

FAN8800 (KA3162)

3. OCP DELAY TIME (TOCP)

1) If the saturation detector(DESAT or Vpin8 ) is 4.5V < Vpin8 < 6.5V, the Fault-Out signal will be high after TOCP.

2) TCOP (This value is fixed internally) is

TOCP = 50pF ⁄ 3µA × 5V

= 83µs

4. CHARGE TIME IN THE DE-SATURATION DETECTION

Internal Circuit

-

+

6.5V

-

+

4.5V

300uA

8

Detect

Control

Q4

Vlink

L

O

A

D

D1

CDESAT

1) When the signal of Drive Output (Vpin5) is high, Q4 turns on and it is operated De-saturation Detection Mode in upper fig-

ure. In this mode, when it detects the voltage of collector- emitter terminal of IGBT through D1.

If Vce(sat) + Vf of D1 > 4.5V, it is operated OCP Mode.

If Vce(sat) + Vf of D1 > 6.5V, it is operated SCP Mode.

When the input signal of IGBT is from low-state to high-state, Q4 turns off and it is operated De-saturation Detection

Mode. On this times, the voltage of collector-emitter terminal of IGBT is not saturation-state yet.

This period is said On Time Delay (Td (on) ).

Here, the operation of CDESAT is following ; When CDESAT is charged by current source of 300uA and so it prevents

operating error for Td (on) of IGBT.

2) Slope of Vpin8 is

∆V ⁄ ∆T = 300µA ⁄ CDESAT

8

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