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L

O

A

D

PTH04000W

R

6.65 k

0.05 W, 1%

SET

Ù

V = 5 V

I

V

= 1.8 V

O

GND

Track

Inhibit

Inhibit

GND

GND

V Adj

O

3

2

5

6

1

4

C1

47 F

(Required)

µ

C

47 F

(Optional)

O

µ

Q1

BSS138

t - Time = 10 ms/div

V (1 V/div)

O

I (500 mA/div)

I

V

(10 V/div)

(INH)

Auto-Track™ Function

PTH04000W

SLTS247A – JUNE 2005 – REVISED JULY 2005

Figure 12. On/Off Inhibit Control Circuit

Figure 13. Power Up Response From Inhibit Control

The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Track

was designed to simplify the amount of circuitry required to make the output voltage from each module power up

and power down in sequence. The sequencing of two or more supply voltages during power up is a common

requirement for complex mixed-signal applications that use dual-voltage VLSI ICs such as the TMS320™ DSP

family, microprocessors, and ASICs.

13