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S8520 데이터시트(PDF) 21 Page - Seiko Instruments Inc

부품명 S8520
상세설명  STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
PDF  44 Pages
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제조업체  SII [Seiko Instruments Inc]
홈페이지  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S8520 데이터시트(HTML) 21 Page - Seiko Instruments Inc

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STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_01
S-8520/8521 Series
21
Standard Circuits
1. Using a bipolar transistor
VSS
VOUT
+
VIN
CIN
L
SD
COUT
Reference voltage
source with soft start
VIN
Tr
Cb
Rb
EXT
+
+
−
PWM control or
PWM / PFM switching
control circuit
Oscillation
circuit
VON/OFF
______
ON/OFF
______
Figure 12
2. Using a Pch MOS FET transistor
VSS
VOUT
L
SD
COUT
+
+
−
VIN
Tr
+
EXT
VIN
CIN
Oscillation
circuit
Reference voltage
source with soft start
PWM control or
PWM / PFM switching
control circuit
VON/OFF
______
ON/OFF
______
Figure 13
Caution
The above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.



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