S-8550 View Datasheet(PDF) - Seiko Instruments Inc
Part Name
Description
Manufacturer
S-8550
Seiko Instruments Inc
S-8550 Datasheet PDF : 31 Pages
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STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550 Series
Rev.5.0_01
Block Diagram
1. SOT-23-5
FB
VIN CIN
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
CFB
VOUT
RFB1
COUT
RFB2
*1. Parasitic diode
ON/OFF
VSS
Figure 1
2. SNT-8A
FB
VIN CIN
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
CFB
VOUT
RFB1
COUT
RFB2
*1. Parasitic diode
ON/OFF
VSS
PVSS
Figure 2
2
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