IP4011 데이터 시트보기 (PDF) - Interpion semiconductor

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IP4011

5-CH MOTOR DRIVE IC

Interpion semiconductor 

IP4011

5-CH MOTOR DRIVE IC

APPLICATION SUMMARY (Continued)

- Thermal shutdown

The IP4011 has a thermal protection against the abnormal operation, and the detailed operation

of the TSD circuit is as follows

VCC2

I TSD

All Output

Driver Bias

Q4

Hysteresis

I HYS

Fig3. Thermal shut down

Temperature

Above 175 OC

Falls below 150 OC

mute

on

off

Hysteresis

25 OC

As shown in figure 3,

TSD circuit controls the base of the TR Q4.

If the junction temperature rises above 175OC,

TR Q4 will be turned on, and the bias current

of the output drive circuit will be shut down

(because of the negative temperature characteristic

of the NPN transistor).

And then temperature falls below 150 OC, TR Q4 will

be turned off.

(hysteresis temperature is about to 25 OC)

- BTL drive part (Focus, Tracking, Spindle, Sled drive part)

BTL drive part is composed of V-I converter, level shifter and output power amp.

23

3 10

19 25

4 24

Iconv

10k

Level

Shift

Ra

20k -Va

-Iconv

+Iconv

20k Va

Ra

Pamp1

Pamp2

2 11

18 26

1 12

17 27

Pref

Fig4. BTL drive part

- V-I converter converts voltage of the input pin into current,

Vin - Vref

Iconv =

10k

* Vin = input voltage of the input pin (pin3, 10, 19, 25) *Vref = reference voltage (pin23)

August. 2002 (Rev.5)

WWW.INTERPIONSEMI.COM

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