HA16108P View Datasheet(PDF) - Renesas Electronics
Part Name
Description
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HA16108P Datasheet PDF : 40 Pages
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HA16107P/FP, HA16108P/FP
Undervoltage Lockout and PWM Output
The undervoltage lockout function turns off the PWM pulse output when the controller’s supply voltage goes below a
designated value. These ICs have two undervoltage lockout circuits. The UVL1 circuit senses the supply voltage VIN.
The UVL2 circuit senses the Vref voltage. A feature of these ICs is that PWM output is turned on only when both
voltages are above designated values. Otherwise, the IC operates in standby mode.
The two built-in undervoltage lockout circuits make it possible to configure an extremely safe power supply system.
PWM output will shut down under a variety of abnormal conditions, such as if Vref is shorted to ground while VIN is
applied.
• UVL1 (VIN and Vref)
*1
IIN
9.5 V 16.2 V
0
10 V
Vref
*2
0
10 V
• UVL2 (Vref and PWM output)
20 V
30 V
6.45 V
34 V
VIN
Notes: 1. Breakdown voltage of
the internal Zener
diode (Vz = 34 V typ).
2. Hysteresis characteristic.
20 V
30 V
VIN
Vref
6.45 V
5V
4V
0
10 V
20 V
30 V
VIN
OUT
Operating region
0
10 V
20 V
30 V
PWM output shut-down region
• UVL1 and UVL2
VIN (UVL1)
Vref (UVL2)
L
H
H
L
L
H
PWM OUT
L
L
OUT
Standby mode
Note: Double circles indicate standby mode.
VIN
L
H
L
Rev.4.00 Jun 15, 2005 page 10 of 39
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