20
LT1786F
LINEAR TECHNOLOGY CORPORATION 1998
1786fa LT/CP 0801 1.5K REV A • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LT1172 Current Mode Switching Regulator for CCFL or LCD Contrast Control 1.25A, 100kHz
LT1173 Micropower DC/DC Converter for LCD Contrast Control 1A, 24kHz, Hysteretic
LT1182 Dual Current Mode Switching Regulator for CCFL and LCD Contrast Control 1.25A, 0.625A, 200kHz
LT1183 Dual Current Mode Switching Regulator for CCFL and LCD Contrast Control 1.25A, 0.625A, 200kHz
LT1184 Current Mode Switching Regulator for CCFL Control 1.25A, 200kHz
LT1184F Current Mode Switching Regulator for CCFL Control 1.25A, 200kHz
LT1186F DAC Programmable Current Mode Switching Regulator for CCFL Control 1.25A, 200kHz, SPI or Pulse Mode
LT1316 Micropower DC/DC Converter for LCD Contrast Control Programmable Peak Current Limit
LT1372 Current Mode Switching Regulator for CCFL or LCD Contrast Contol 1.5A, 500kHz
LT1786 CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime Multiple Lamp Capability, No Lamp Flicker, Precision
Maximum and Minimum Lamp Currents Maximize
Lamp Life
RELATED PARTS
TYPICAL APPLICATION
U
90% Efficient Grounded CCFL with 2-Wire SMBus Control of Lamp Current
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
16
15
14
13
12
11
10
9
+
C7
1µF
C4
2.2µF
3V < V
CC
< 6.5V
TO
SMBus
HOST
SHUTDOWN
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
D1
BAT85
1
2
3
4
5
6
7
8
BAT
8V TO 28V
LAMP
10
6
L1
R1
750Ω
1%
L2
100µH
321 5
4
C1
0.068µF
C5
1000pF
R2
221k
1%
R3
100k
1%
1786F TA03
C3
2.2µF
35V
C2
27pF
3kV
+
Q2 Q1
D1
1N5818
I
CCFL
DIO
CCFL V
C
AGND
SHDN
SMBSUS
ADR
CCFL V
SW
BULB
BAT
ROYER
V
CC
I
OUT
SCL
SDA
CCFL
PGND
LT1786F
