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S8821 датащи(PDF) 9 Page - Seiko Instruments Inc

номер детали S8821
подробное описание детали  VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER
PDF  24 Pages
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производитель  SII [Seiko Instruments Inc]
домашняя страница  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S8821 датащи(HTML) 9 Page - Seiko Instruments Inc

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VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER
Rev.5.1_02
S-8821 Series
9
Operation
1. Basic operation
Figure 7 shows the block diagram of the S-8821 Series.
The S-8821 series controls the output voltage by using the pulse frequency modulation (PFM) method.
The SW1 to SW4 switching transistors are switched ON/OFF with the clock generated by the internal
oscillator circuit, and operates the boost charge pump.
The output voltage is fed back and the voltage split by feedback resistances Rs and Rf and reference
voltage (Vref) are compared by a comparator. This comparator signal is used to modulate the oscillation
pulse frequency in order to keep the output voltage constant.
VIN
Switch
control
circuit
SW1
SW2
SW3
SW4
C
+
C
−
CPUMP=0.10
μF
Soft start
circuit
ON/OFF
circuit
ON/OFF
PFM control
oscillator
circuit
(1.0 MHz)
Reference
voltage
+
-
VOUT
GND
COUT=10
μF
Rs
Rf
CIN=4.7
μF
Figure 7



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