S-8550 SII [Seiko Instruments Inc], S-8550 Datasheet - Page 2
S-8550
Manufacturer Part Number
S-8550
Description
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECIFICATION, PWM CONTROL SWITCHING REGULATORS
Manufacturer
SII [Seiko Instruments Inc]
Datasheet
1.S-8550.pdf
(26 pages)
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2
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
Block Diagram
*1. Parasitic diode
V
IN
C
IN
FB
Error amplifier
Reference
voltage
−
+
ON/OFF
circuit
ON/OFF
Seiko Instruments Inc.
PWM comparator
+
−
Current limit
circuit
UVLO
circuit
Figure 1
Triangular wave
PWM control
generation
circuit
circuit
IC internal
power supply
VIN
VSS
*1
*1
CONT
L
C
FB
Rev.2.1
R
R
FB1
FB2
V
OUT
C
OUT
_01
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