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| 型号： | LT1186FIS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG SW CCFL DAC PROG 16SOIC |
| 标准包装： | 2,500 |
| 系列： | Bits-to-Nits™ |
| 类型： | CCFL 控制器 |
| 频率： | 175 ~ 225 kHz |
| 电流 - 电源： | 6mA |
| 电源电压： | 3 V ~ 6.5 V |
| 工作温度： | -40°C ~ 100°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
LT1186F
DAC Programmable
CCFL Switching Regulator
(Bits-to-Nits TM )
FEATURES
face modes including standard SPI mode and pulse mode.
On power-up, the DAC counter resets to half-scale and t he
s
s
Wide Battery Input Range: 4.5V to 30V
Grounded Lamp or Floating Lamp Configurations
DAC configures to SPI or pulse mode depending on the CS
signal level. In SPI mode, the system microprocessor
s
s
Open Lamp Protection serially transfers the present 8-bit data and reads back the
Precision 50 μ A Full-Scale DAC Programming Current previous 8-bit data. In pulse mode, the upper six bits of the
s
s
Standard SPI Mode or Pulse Mode
DAC Setting Is Retained in Shutdown
DAC configure as increment-only (1-wire interface) or
increment/decrement (2-wire interface) operation depend-
Notebook and Palmtop Computers
Portable Instruments
Retail Terminals
APPLICATIO NS
s
s
s
DESCRIPTIO N
The LT ? 1186F is a fixed frequency, current mode, switch-
ing regulator that provides the control function for Cold
Cathode Fluorescent Lighting (CCFL). The IC includes an
efficient high current switch, an oscillator, output drive
logic, control circuitry and a micropower 8-bit 50 μ A full-
scale current output DAC. The DAC provides simple “bits-
to-lamp current control” and communicates in two inter-
ing on the D IN signal level.
The LT1186F control circuitry operates from a logic supply
voltage of 3.3V or 5V. The IC also has a battery supply
voltage pin that operates from 4.5V to 30V. The LT1186F
draws 6mA typical quiescent current. An active low shut-
down pin reduces total supply current to 35 μ A for standby
operation and the DAC retains its last setting. A 200kHz
switching frequency minimizes magnetic component size.
Current mode switching techniques with cycle-by-cycle
limiting gives high reliability and simple loop frequency
compensation. The LT1186F is available in a 16-pin nar-
row SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Bits-to-Nits is a trademark of Linear Technology Corporation. 1 Nit = 1 Candela/meter 2
TYPICAL APPLICATIO N
90% Efficient Floating CCFL with 1-Wire (Increment Only) Pulse Mode Control of Lamp Current
D1
BAT85
CCFL BACKLIGHT APPLICATION CIRCUITS
CONTAINED IN THIS DATA SHEET ARE COVERED
BY U.S. PATENT NUMBER 5408162
AND OTHER PATENTS PENDING
UP TO 6mA
LAMP
10 6
C2
27pF
3kV
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
* DO NOT SUBSTITUTE COMPONENTS
1
CCFL
PGND
CCFL V SW
16
C5
1000pF
L1
COILTRONICS (407) 241-7876
C4
C7, 1 μ F
SHUTDOWN
FROM MPU
2
3
4
5
6
7
I CCFL BULB
DIO BAT
LT1186F
CCFL V C ROYER
AGND V CC
SHDN I OUT
CLK D OUT
15
14
13
12
11
10
+
V IN
3.3V
OR 5V
2.2 μ F
R2
220k
R3
100k
3
Q2*
2 1
+ C3B
2.2 μ F
35V
C1*
0.068 μ F
Q1*
4
5
R1
750 ?
+
C3A
2.2 μ F
35V
BAT
8V TO 28V
8
CS
D IN 9
L2
100 μ H
D1
1N5818
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3A AND C3B.
MAKE 3CB ESR ≥ 0.5 ? TO PREVENT DAMAGE TO THE LT1186F HIGH-SIDE
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON
LT1186F ? TA01
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
0 μ A TO 50 μ A I CCFL CURRENT GIVES
0mA TO 6mA LAMP CURRENT
FOR A TYPICAL DISPLAY.
FOR ADDITIONAL CCFL/LCD CONTRAST APPLICATION CIRCUITS,
REFER TO THE LT1182/83/84/84F DATA SHEET
1
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