LT1786F データシートの表示（PDF） - Linear Technology
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LT1786F Datasheet PDF : 20 Pages
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LT1786F
TYPICAL APPLICATION
90% Efficient Grounded CCFL with 2-Wire SMBus Control of Lamp Current
C5
1000pF
D1
BAT85
C7
1µF
SHUTDOWN
1 CCFL
PGND
2
ICCFL
16
CCFL VSW
15
BULB
3
DIO
14
BAT
4
LT1786F
13
CCFL VC
ROYER
5
AGND
12
VCC
6
SHDN
11
IOUT
7
SMBSUS
10
SCL
8
ADR
9
SDA
R2
221k
1%
R3
100k
1%
LAMP
10 6
3
21
+ C3
2.2µF
35V
C1
0.068µF
C2
27pF
3kV
L1
45
R1
750Ω
1%
Q2
Q1
L2
100µH
D1
1N5818
BAT
8V TO 28V
1786F TA03
3V < VCC
+
< 6.5V
C4
2.2µF
TO
SMBus
HOST
C1 MUST BE A LOW LOSS CAPACITOR
C1 = WIMA MKI OR MKP-20
PANASONIC ECH-U
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
(DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (561) 241-7876)
Q1, Q2 = ZETEX ZTX849 OR ROHM 25C5001
RELATED PARTS
PART NUMBER
LT1172
LT1173
LT1182
LT1183
LT1184
LT1184F
LT1186F
LT1316
LT1372
DESCRIPTION
Current Mode Switching Regulator for CCFL or LCD Contrast Control
Micropower DC/DC Converter for LCD Contrast Control
Dual Current Mode Switching Regulator for CCFL and LCD Contrast Control
Dual Current Mode Switching Regulator for CCFL and LCD Contrast Control
Current Mode Switching Regulator for CCFL Control
Current Mode Switching Regulator for CCFL Control
DAC Programmable Current Mode Switching Regulator for CCFL Control
Micropower DC/DC Converter for LCD Contrast Control
Current Mode Switching Regulator for CCFL or LCD Contrast Contol
COMMENTS
1.25A, 100kHz
1A, 24kHz, Hysteretic
1.25A, 0.625A, 200kHz
1.25A, 0.625A, 200kHz
1.25A, 200kHz
1.25A, 200kHz
1.25A, 200kHz, SPI or Pulse Mode
Programmable Peak Current Limit
1.5A, 500kHz
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900q FAX:(408)434-0507 q www.linear-tech.com
1786f LT/TP 0898 4K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1998
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