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SC4501 Folha de dados(PDF) 19 Page - Semtech Corporation

Nome de Peças SC4501
Descrição Electrónicos  2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
PDF  21 Pages
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Fabricante Electrônico  SEMTECH [Semtech Corporation]
Página de início  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4501 Folha de dados(HTML) 19 Page - Semtech Corporation

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© 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4501
Typical Application Circuits
C1
2.2
µF
SC4501
2
3
1
5
6
4
GND
SHDN
SS
IN
SW
FB
ROSC
COMP
8
7
R4
10BQ015
D1
C3
10nF
4.7
µF
C2
R2
43.2K
R1
698
8.06K
C4
10nF
L1
2.2
µH
R5
10K
0.1
Ω
R6
2.6 - 4.2V
1-CELL
LI-ION
1/2
LM358
0.2A (TORCH)
MMBT 3904T
SUMIDA
CR43
ON
OFF
D2
LXCL-PWF1
Q1
C5
0.1
µF
R6
17.4K
FLASH
TORCH
- 3.4V to 3.8V +
MMBF2201NT1
M1
0.7A (FLASH)
Figure 14(a). 1.4MHz LuxeonTM Flash White LED Driver for Camera Phones
Figure 14(b) and 14(c). Photo Flash LED Current is Switched Between Torch Mode (0.2A) and Flash Mode (0.7A).
CH1 : Torch/Flash Control Voltage, 5V/div
CH4 : Inductor Current, 1A/div
CH2 : FB Pin Voltage, 1V/div
CH3 : LED Current, 0.5A/div
Higher LED Current (>0.7A) in Flash Mode is Possible with Fresh Battery.
4ms/div
CH1
CH2
CH3
CH4
VIN = 2.6V
(b)
CH1
CH2
CH3
CH4
VIN = 4.2V
4ms/div
(c)



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