S-8550 Datasheet, PDF (2/26 Pages) Seiko Instruments Inc – STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
Rev.2.1_01
„ Block Diagram
FB
V_IN C_IN
Error amplifier
Current limit
circuit
IC internal
power supply
−
+
Reference
voltage
+
PWM control
−
circuit
PWM comparator
Triangular wave
generation
circuit
ON/OFF
UVLO
circuit
circuit
VIN
*1
CONT
L
*1
C_FB
V_OUT
R_FB1
C_OUT
R_FB2
*1. Parasitic diode
ON/OFF
VSS
Figure 1
2
Seiko Instruments Inc.