S-8327 Seiko, S-8327 Datasheet - Page 60

• Manufacturer Part Number: S-8327
• Description: (S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
• Manufacturer: Seiko

Collection of Product FAQs
Author: Tachibana Midori
<Information level>
<Product>
Related documents:
Question:
Answer:
A:
Index:
Division name: 01 IC
Category 1:
Category 2:
Cal No.:
In the output-voltage regulator circuit described on the data sheet, how can the output be discharged to
GND when the power is turned off?



VIN
If the rush current flowing from the input power supply does not cause a problem when the power is
turned on:
When turning off the power, switch off SWR from VIN.
Since Tr 2 is off when the power is off, turn on Tr 3 to discharge Cout through RC.
If the rush current causes a problem when the power is turned on:
When turning off the power, switch off the VDD of IC and the GND side of the external resistance.
Since Tr 3 and Tr 4 are off when the power is off, turn on Tr 5 to discharge Cout 2 through RC.
Two sets of inputs for turning on the power, a positive logic and a negative logic, are required.
ON/OFF
Cin
Tr2
Public (Printing O.K.)
11 Power Supply
4. Switching Regulators
S-8323/24/27/28
B: Technical
L
Tr1
Date: 98/11/12 (Thursday) 10:17 (Modified: )
VDD
EXT
SD
Figure 1
S-8327/8E
Internal
circuit
VSS
VOUT
59
R1
R2
RA
RB
Cc
Cout
RC
Tr3
OUT
GND