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| 型號(hào)： | 935269491115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.3 A SWITCHING REGULATOR, 57.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | 1.50 MM, PLASTIC, MO-178, SOT-25, SOT-23, SOP-5 |
| 文件頁(yè)數(shù)： | 2/21頁(yè) |
| 文件大小： | 333K |
| 代理商： | 935269491115 |
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Philips Semiconductors
Product data
SA57254-XX
CMOS switching regulator (PWM controlled)
2001 Aug 01
10
APPLICATION INFORMATION
The SA57254-XX can be used for a simple boost (step-up)
converter or the less commonly used flyback converter (isolated
boost). The major operating restriction of the simple boost converter
is that its output voltage must always be above the highest
expected value of the input voltage. The flyback converter circuit
requires more parts, but the output voltage is not restricted by the
input voltage.
Boost converter fundamentals
The boost or step-up converter is a non-dielectrically isolated
switching power supply topology (arrangement of power parts). That
is, the input power source is directly connected to the output load
(ground and signals). A typical boost converter, with an optional
passive snubber, can be seen in Figure 24.
To understand the boost converter’s operation, examine its three
periods of operation. These periods are: the power switch on-time
(period 1); the inductor discharge period (period 2); and the inductor
empty state (period 3). These periods and their associated currents
can be seen in Figure 25.
SL01504
D
VIN
CIN
GND
SA57254-XX
SW
VDD
PASSIVE SNUBBER
(OPTIONAL)
VOUT
COUT
FB
L0
Figure 24. Boost converter.
SL01464
SWITCH
VOLTAGE
(V)
INDUCTOR
CURRENT
(A)
0
VIN
(VIN – VOUT)
Ipeak
ISW × RDS(ON)
CORE EMPTY,
PARASITIC CIRCULATING ENERGY
+VOUT
ENERGY BEING TRANSFERRED TO OUTPUT
SPIKE
ENERGY BEING
STORED IN INDUCTOR
+VIN
L0
PERIOD 1
PERIOD 2
PERIOD 3
Figure 25. Boost converter waveforms (discontinuous mode).
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