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參數(shù)資料
| 型號： | 83F5958 |
| 英文描述： | IC-1.25A SWITCHING REGULATOR |
| 中文描述： | 集成電路1.25A的開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 129K |
| 代理商： | 83F5958 |
MIC2172/3172
Micrel
4-28
1997
MIC3172
V
IN
V
SW
FB
COMP
C1
V
IN
4.5V to 20V
EN
GND
P1 P2 S
Enable (On)
Shutdown (Off)
Cold Cathode
Fluorescent
Lamp
R5
Intensity
Control
R1
D1
R2
Q1
Q2
C2
C3
C4
C5
R3
R4
D3
1N4148
D2
1N4148
T1
F
P
P
L1
300μH
S
L1: Coiltronics CTX300-4P
T1: Coiltronics CTX110602
C2: Polyfilm, WIMA FKP2 0.1μF to 0.68μF
C4: 15pF to 30pF, 3kV min.
Figure 15. LCD Backlight Fluorescent Lamp Supply
On/Off Control
Especially important for battery powered applications, the
lamp can be remotely or automatically turned off using the
MIC3172’s EN pin. The entire circuit draws less than 1
μ
A
while shutdown.
Efficiency
To obtain maximum circuit efficiency careful selection of Q1
and Q2 for low collector to emitter saturation voltage is a
must. Inductor L1 should be chosen for minimal core and
copper losses at the switching frequency of the MIC3172, and
T1 should be carefully constructed from magnetic materials
optimized for the output power required at the Royer oscillator
frequency. Suitable inductors may be obtained from
Coiltronics, Inc., tel: (407) 241-7876.
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