ha16116fpj Renesas Electronics Corporation., ha16116fpj Datasheet - Page 14

• Manufacturer Part Number: ha16116fpj
• Description: Switching Regulator For Chopper Type Dc/dc Converter
• Manufacturer: Renesas Electronics Corporation.

HA16116FP/FPJ, HA16121FP/FPJ
5.2 Quick Shutoff
When the UVL circuit goes into operation, a sink transistor is switched on as in the figure below, drawing
off the excess current. This transistor also functions when the IC is turned off, drawing off current from the
C
Rev.2.0, Sep.18.2003, page 14 of 33
T
, E/O, and DB pins and enabling quick shutoff.
PWM
output
On
Off
generation
Vref
circuit
PWM
output
off
V
When V
low
IN
OVP
Relation of Vref to UVL and OVP
1.7 2.0
IN
ZD
5.6 V
Figure 5.1 Quick Shutoff
is
10 k
Vref
R
2.5
PWM output on
2.0 V and
1.7 V
detection
To other circuitry
UVL
Abnormal voltage
applied to Vref
Internal
pulse
signal
line
5.0
Sink
transistor
OUT
Vref
7.0
PWM
output off
Vref (V)
OUT