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S-8550AA-I8T1U Datasheet(PDF) 2 Page - Seiko Instruments Inc

Part # S-8550AA-I8T1U
Description  RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-8550AA-I8T1U Datasheet(HTML) 2 Page - Seiko Instruments Inc

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STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550 Series
Rev.5.0_01
2
Block Diagram
1. SOT-23-5
L
ON/OFF
VIN
+
+
CIN
FB
VIN
CONT
VSS
CFB
RFB1
RFB2
VOUT
COUT
*1
*1
Reference
voltage
PWM comparator
PWM control
circuit
UVLO
circuit
ON/OFF
circuit
IC internal
power supply
Current limit
circuit
Error amplifier
Triangular wave
generation
circuit
*1. Parasitic diode
Figure 1
2. SNT-8A
L
ON/OFF
VIN
+
+
CIN
FB
VIN
CONT
PVSS
CFB
RFB1
RFB2
VOUT
COUT
*1
*1
Reference
voltage
PWM comparator
PWM control
circuit
UVLO
circuit
ON/OFF
circuit
IC internal
power supply
Current limit
circuit
Error amplifier
Triangular wave
generation
circuit
VSS
*1. Parasitic diode
Figure 2


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