2AS01 datasheet(12/24 Pages) INFINEON

12 / 24 page

Datasheet

30 Jun 2006

Preliminary Data

ICE2AS01/S01G

ICE2BS01/S01G

Functional Description

transistors as well as to protect them against

undesirable gate overvoltages.

Figure 17 Gate Driver

At voltages below the undervoltage lockout threshold

VVCCoff the gate drive is active low.

The driver-stage is optimized to minimize EMI and to

provide high circuit efficiency. This is done by reducing

the switch on slope when reaching the external Power

Switch threshold. This is achieved by a slope control of

the rising edge at the driver’s output (see Figure 18).

Figure 18 Gate Rising Slope

Thus the leading switch on spike is minimized. When

the external Power Switch is switched off, the falling

shape of the driver is slowed down when reaching 2V

to prevent an overshoot below ground. Furthermore the

driver circuit is designed to eliminate cross conduction

of the output stage.

3.8

Protection Unit (Auto Restart Mode)

An overload, open loop and overvoltage detection is

integrated within the Protection Unit. These three

failure modes are latched by an Error-Latch. Additional

thermal shutdown is latched by the Error-Latch. In case

of those failure modes the Error-Latch is set after a

blanking time of 5µs and the external Power Switch is

shut down. That blanking prevents the Error-Latch from

distortions caused by spikes during operation mode.

3.8.1

Overload & Open loop with normal

load

Figure 19 Auto Restart Mode

Figure 19 shows the Auto Restart Mode in case of

overload or open loop with normal load. The detection

of open loop or overload is provided by the Comparator

C3, C4 and the AND-gate G2 (see Figure20).

VCC

PWM-Latch

Gate

Load = 1nF

ca. t = 130ns

Overload & Open loop/normal load

4.8V

5.3V

SoftS

5µs Blanking

Failure

Detection

Soft-Start Phase

VCC

13.5V

8.5V

Driver

Restart

Burst1

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