ip4001tf Interpion semiconductor Inc., ip4001tf Datasheet - Page 6

• Manufacturer Part Number: ip4001tf
• Description: 5-ch Motor Drive Ic Semiconductor
• Manufacturer: Interpion semiconductor Inc.

August. 2002
- Thermal shutdown
- BTL drive part (Focus, Tracking, Spindle, Sled drive part)
APPLICATION SUMMARY (Continued)
The IP4001 has a thermal protection against the abnormal operation, and the detailed operation
of the TSD circuit is as follows
BTL drive part is composed of V-I converter, level shifter and output power amp.
- V-I converter converts voltage of the input pin into current,
Hysteresis
19
3
4
* Vin = input voltage of the input pin (pin3, 10, 19, 25)
Fig3. Thermal shut down
10
25
24
(Rev.7)
23
I
HYS
Iconv
VCC2
Iconv
10k
I
=
TSD
Vin
10k
Q4
-
Vref
Driver Bias
All Output
Fig4. BTL drive part
WWW.INTERPIONSEMI.COM
Shift
Level
5-CH MOTOR DRIVE IC
As shown in figure 3,
TSD circuit controls the base of the TR Q4.
If the junction temperature rises above 175
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
be turned off.
(hysteresis temperature is about to 25
Falls below 150
Pref
Above 175
Temperature
IP4001
Hysteresis
Ra
10.6k
10.6k
Ra
-Iconv
+Iconv
*Vref = reference voltage (pin23)
-Va
Va
O
C
O
C
Pamp1
Pamp2
25
mute
on
off
O
C
O
O
C, TR Q4 will
18
17
C)
2
1
O
11
26
12
27
C,
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