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S-8340A30AFT-T2-U Datasheet(PDF) 2 Page - Seiko Instruments Inc

Part # S-8340A30AFT-T2-U
Description  SWITCHABLE SWITCHING REGULATOR CONTROLLER
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-8340A30AFT-T2-U Datasheet(HTML) 2 Page - Seiko Instruments Inc

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STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8340/8341 Series
Rev.4.0_01
2
Block Diagrams
(1) S-8340/8341 Series A and C Types (Output Voltage Fixed Output Type)
CS
RS
R2
R1
CC
VSS
VOUT
VOUT
SD
CL
ON/OFF
VDD
L
EXT
Shutdown
circuit
VIN
CVREF
CVREF
CSS
CSS
Nch Power
MOS FET
120 mV
RSENSE
SENSE
PWM comparator
Error amplifier
VREF =1.0 V
+
PWM, PWM/PFM
switching control
circuit
Triangular wave
oscillation circuit
Phase
IC internal power
compensation
Soft-start
circuit
Voltage/current
reference
circuit
supply
Figure 1
(2) S-8340/8341 Series B and D Types (Output Voltage External Setting Type)
CS
RS
RFB2
RFB1
CFB
VSS
VOUT
FB
SD
CL
ON/OFF
VDD
L
EXT
VIN
CVREF
CVREF
CSS
CSS
Nch Power
MOS FET
120 mV
RSENSE
SENSE
PWM comparator
VREF =1.0 V
+
Triangular wave
oscillation circuit
Phase
compensation
circuit
IC internal power
supply
Error amplifier
PWM, PWM/PFM
switching control
circuit
Shutdown
circuit
Soft-start
circuit
Voltage/current
reference
Figure 2


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