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參數資料
型號: 935269486115
廠商: NXP SEMICONDUCTORS
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO5
封裝: 1.50 MM, PLASTIC, MO-178, SOT-25, SOT-23, SOP-5
文件頁數: 20/21頁
文件大?。?/td> 298K
代理商: 935269486115
Philips Semiconductors
Product data
SA57251-XX
CMOS switching regulator (PWM controlled)
2001 Aug 01
8
TECHNICAL DISCUSSION
General discussion
The SA57251-XX is a fixed frequency, boost-mode switching power
supply controller. Each device is set to provide a fixed output voltage
by having a fully compensated internal voltage feedback loop. The
SA57251-XX operates at a fixed frequency of 100 kHz and can
operate from a single alkaline cell (0.9 V) or up to 9 V.
The SA57251-XX requires an external NPN bipolar transistor to
provide the switching power waveform. Its internal block diagram is
shown in Figure 19.
The SA57251-XX can be turned off via an ON/OFF pin, thus
allowing the system to unpower portions of the circuitry for added
power savings.
SL01496
2
VREF
5
4
SA57251-XX
GND
FB
PWM CONTROL
SOFT START
R
DRIVE
VDD
ON/OFF
1
Figure 19. Functional diagram.
相關PDF資料
PDF描述
935269487115 SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO5
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935269488115 SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO5
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