參數(shù)資料
型號(hào)： LT1186FI
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 206K
代理商： LT1186FI
1
LT1186F
DAC Programmable
CCFL Switching Regulator
(Bits-to-Nits
TM
)
face modes including standard SPI mode and pulse mode.
On power-up, the DAC counter resets to half-scale and the
DAC configures to SPI or pulse mode depending on the CS
signal level. In SPI mode, the system microprocessor
serially transfers the present 8-bit data and reads back the
previous 8-bit data. In pulse mode, the upper six bits of the
DAC configure as increment-only (1-wire interface) or
increment/decrement (2-wire interface) operation depend-
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.
FEATURES
I
Wide Battery Input Range: 4.5V to 30V
I
Grounded Lamp or Floating Lamp Configurations
I
Open Lamp Protection
I
Precision 50
μ
A Full-Scale DAC Programming Current
I
Standard SPI Mode or Pulse Mode
I
DAC Setting Is Retained in Shutdown
APPLICATIO
S
U
I
Notebook and Palmtop Computers
I
Portable Instruments
I
Retail Terminals
DESCRIPTIO
N
U
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-
TYPICAL APPLICATIO
N
U
90% Efficient Floating CCFL with 1-Wire (Increment Only) Pulse Mode Control of Lamp Current
, 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
BAT
8V TO 28V
16
15
14
13
12
11
10
9
I
CCFL
DIO
CCFL V
C
AGND
SHDN
CLK
CCFL V
SW
BULB
BAT
ROYER
V
CC
I
OUT
D
OUT
D
IN
CCFL
PGND
CS
LT1186F
LAMP
UP TO 6mA
10
6
L1
R1
750
L2
100
μ
H
3
2
1
5
4
+
+
C7, 1
μ
F
C1*
0.068
μ
F
C5
1000pF
R2
220k
R3
100k
C3A
2.2
μ
F
35V
C4
2.2
μ
F
V
3.3V
OR 5V
LT1186F TA01
C3B
2.2
μ
F
35V
C2
27pF
3kV
+
Q2*
Q1*
SHUTDOWN
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
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
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
D1
BAT85
FROM MPU
1
2
3
4
5
6
7
8
D1
1N5818
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
*
DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (407) 241-7876
CCFL BACKLIGHT APPLICATION CIRCUITS
CONTAINED IN THIS DATA SHEET ARE COVERED
BY U.S. PATENT NUMBER 5408162
AND OTHER PATENTS PENDING
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