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參數(shù)資料
| 型號(hào)： | LT1186FIS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 3 A FLUORESCENT LIGHT CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 206K |
| 代理商： | LT1186FIS |
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9
LT1186F
PI
FU
CTIO
N
S
U
U
BAT (Pin 14):
This pin connects to the battery or AC wall
adapter voltage from which the CCFL Royer converter
operates. This voltage is typically higher than the V
CC
supply voltage but can equal V
CC
if V
CC
is a 5V logic supply.
The BAT voltage must be at least 2.1V greater than the
internal 2.4V regulator or 4.5V. This pin provides biasing
for the lamp-current programming block, is used with the
Royer pin for floating-lamp configurations and connects
to one input for the open-lamp protection circuitry. For
floating-lamp configurations, this pin is the noninverting
terminal of a high-side current sense amplifier. The typical
quiescent current is 50
μ
A into the pin. The BAT and Royer
pins monitor the primary-side Royer converter current
through an internal 0.1
topside current sense resistor. A
0A to1A primary-side, center tap converter current is
translated to an input signal range of 0mV to 100mV for the
current sense amplifier. This input range translates to a
0
μ
A to 500
μ
A sink current at the CCFL V
C
pin that nulls
against the source current provided by the programmer
circuit. The BAT pin also connects to the topside of the
internal clamp between the BAT and BULB pins that is used
for open-lamp protection.
BULB (Pin 15):
This pin connects to the low side of a 7V
threshold comparator between the BAT and BULB pins.
This circuit sets the maximum voltage level across the
primary side of the Royer converter under all operating
conditions and limits the maximum secondary output
under start-up conditions or open-lamp conditions. This
eases transformer voltage rating requirements. Set the
voltage limit to ensure lamp start-up with worst-case,
lamp start voltages and cold temperature, system operat-
ing conditions. The BULB pin connects to the junction of
an external divider network. The divider network connects
from the center tap of the Royer transformer or the actual
battery supply voltage to the topside of the current source
“tail inductor.” A capacitor across the top of the divider
network filters switching ripple and sets a time constant
that determines how quickly the clamp activates. When
the comparator activates, sink current is generated to pull
the CCFL V
C
pin down. This action transfers the entire
regulator loop from current mode operation into voltage
mode operation.
CCFL V
SW
(Pin 16):
This pin is the collector of the internal
NPN power switch for the CCFL regulator. The power
switch provides a minimum of 1.25A. Maximum switch
current is a function of duty cycle as internal slope com-
pensation ensures stability with duty cycles greater than
50%. Using a driver loop to automatically adapt base drive
current to the minimum required to keep the switch in a
quasi-saturation state yields fast switching times and high
efficiency operation. The ratio of switch current to driver
current is about 50:1.
TEST CIRCUITS
3k
100pF
LT1186F TC02
5V t
DZ
WAVEFORM 2, t
DV
t
DZ
WAVEFORM 1
D
OUT
Load Circuit for t
DZ
, t
DV
Load Circuit for t
DO
3k
100pF
LT1186F TC01
1.4V
D
OUT
Voltage Waveforms for t
DZ
, t
DV
0.8V
0.4V
2.4V
LT1186F TC03
D
OUT
CLK
t
DO
Voltage Waveforms for t
DO
LT1186F TC04
0.8V
CS
D
WAVEFORM 1
(SEE NOTE 1)
D
WAVEFORM 2
(SEE NOTE 2)
2.4V
2.0V
90%
10%
0.4V
t
DV
t
DZ
NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL
CONDITIONS SUCH THAT THE OUTPUT IS HIGH UNLESS
DISABLED BY CS
NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL
CONDITIONS SUCH THAT THE OUTPUT IS LOW UNLESS
DISABLED BY CS
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| LT1186FIS#PBF | 功能描述:IC SW REG CCFL DAC PROG 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:Bits-to-Nits™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| LT1186FIS#TR | 功能描述:IC REG SW CCFL DAC PROG 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:Bits-to-Nits™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| LT1186FIS#TRPBF | 功能描述:IC SW REG CCFL DAC PROG 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:Bits-to-Nits™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
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