S-8327 Seiko, S-8327 Datasheet - Page 65

• 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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Index:
Division name: 01 IC
Category 1:
Category 2:
Cal No.:
How can we ensure high efficiency?
Follow these instructions:
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FAQ No.: 11S8323001
Make sure the allowable current (maximum rating) of the used coil is greater than the peak current of
the coil. (If the current exceeds the allowable value, efficiency decreases due to magnetic
saturation.)
Select an external diode with low VF characteristics and a short first-recovery time.
The equivalent series resistance (ESR) of the output capacitor, Cout, significantly affects efficiency.
Select a low ESR.
In the external-switching transistor type (S-8322 S-8327/8), the ON resistance varies with the base
resistance Rb (the resistance between the EXT terminal and the external transistor base), thereby
affecting efficiency. (Efficiency decreases as Rb increases.) It should also be noted that the current
consumption increases as the Rb value decreases, resulting in a decrease in efficiency.
Public (Printing O.K.)
11 Power Supply
4. Switching Regulators
S-8323/24/27/28
B: Technical
Date: 98/11/12 (Thursday) 10:17 (Modified: )
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