S-8327 Seiko, S-8327 Datasheet - Page 62

• 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
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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 is the power turned off?



VIN
If the rush current does not cause a problem when the power is turned on:
When turning off the power, switch off SWR from VIN.
When the power is turned on (VIN and SWR are connected), a rush current flows at Cout.
If the rush current causes a problem when the power is turned on:
When turning off the power, switch off VDD of IC and the GND side of the external resistance.
Two sets of inputs for turning on the power, a positive logic and a negative logic, are required. To
restrict the rush current, increase the capacitance of Cc so that the soft start-up time is prolonged.
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
S-8327/8E
Figure 1
Internal
circuit
VSS
VOUT
61
R1
R2
RA
RB
Cc
Cout
OUT
GND