S-8327 Seiko, S-8327 Datasheet - Page 53

• 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.:
What is the basic concept of the S-8323 peak current?
1. Ipk in boosting




The basic concept is as follows:
Loss Pon of VIN due to il in the figure below is:
Loss Pon of VIN due to i2 in the figure below is:
Assuming that
Iout
Ipk
Pon
Poff
Iout
=
×
=
=
=
Vout
1
2
2
1
1
2
2
×
×
×
×
L
L
L
Iout
=
×
×
×
Public (Printing O.K.)
11 Power Supply
4. Switching Regulators
S-8323/24/27/28
B: Technical
Pon
fosc
fosc
fosc
L
( ×


×
+
Vout
fosc
+
×
×

×
Poff
Ipk
Ipk
Ipk
is equal to energy Pout supplied from Vout,
-
2
2
2
×
VIN
×
Vout
Vout
Date: 98/11/12 (Thursday) 10:17 (Modified:)
)
VIN
1
-
-
VIN
VIN
52