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参数资料
| 型号： | LT1184CS |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1.25 A FLUORESCENT LIGHT CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SO-16 |
| 文件页数： | 11/24页 |
| 文件大小： | 409K |
| 代理商： | LT1184CS |
11
LT1182/LT1183/LT1184/LT1184F
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 insure lamp start-up with worst-case, lamp
start voltages and cold-temperature system operating
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 top side 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.
BAT (Pin 14):
This pin connects to the battery or battery
charger voltage from which the CCFL Royer converter and
LCD contrast converter operate. This voltage is typically
higher than the V
IN
supply voltage but can be equal or less
than V
IN
. However, the BAT voltage must be at least 2.1V
greater than the internal 2.4V regulator or 4.5V minimum
up to 30V maximum. 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 quies-
cent 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
top side current sense resistor. A 0A to 1A
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 top side of an internal clamp
between the BAT and Bulb pins.
PI
FU
CTIO
N
S
U
U
Royer (Pin 13):
This pin connects to the center-tapped
primary of the Royer converter and is used with the BAT
pin in a floating lamp configuration where lamp current is
controlled by sensing Royer primary side converter cur-
rent. This pin is the inverting terminal of a high-side
current sense amplifier. The typical quiescent current is
50
μ
A into the pin. If the CCFL regulator is not used in a
floating lamp configuration, tie the Royer and BAT pins
together. This pin is only available on the LT1182/LT1183/
LT1184F.
V
IN
(Pin 12):
This pin is the supply pin for the LT1182/
LT1183/LT1184/LT1184F. The ICs accept an input voltage
range of 3V minimum to 30V maximum with little change
in quiescent current (zero switch current). An internal,
low dropout regulator provides a 2.4V supply for most of
the internal circuitry. Supply current increases as switch
current increases at a rate approximately 1/50 of switch
current. This corresponds to a forced Beta of 50 for each
switch. The ICs incorporate undervoltage lockout by sens-
ing regulator dropout and lockout switching for input
voltages below 2.5V. Hysteresis is not used to maximize
the useful range of input voltage. The typical input voltage
is a 3.3V or 5V logic supply.
LT1182/LT1183
LCD V
C
(Pin 7):
This pin is the output of the LCD contrast
error amplifier and the input of the current comparator for
the LCD contrast regulator. Its uses include frequency
compensation and current limiting. The voltage on the
LCD V
C
pin determines the current trip level for switch
turnoff. During normal operation, this pin sits at a voltage
between 0.95V (zero switch current) and 2.0V (maximum
switch current). The LCD V
C
pin has a high impedance
output and permits external voltage clamping to adjust
current limit. A series R/C network to ground provides
stable loop compensation.
LCD PGND (Pin 8):
This pin is the emitter of an internal
NPN power switch. LCD contrast switch current flows
through this pin and permits internal, switch-current
sensing. The regulators provide a separate analog ground
and power ground(s) to isolate high current ground paths
from low current signal paths. Linear Technology recom-
mends star-ground layout techniques.
相关PDF资料 |
PDF描述 |
|---|---|
| LT1182 | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LT1183 | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LT1184 | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LT1184F | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LT1185CQ | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
相关代理商/技术参数 |
参数描述 |
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| LT1184CS#PBF | 功能描述:IC SW REG CCFL CONTRAST 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1184CS#TR | 功能描述:IC REG SWITCH DUAL CCFL 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1184CS#TRPBF | 功能描述:IC SW REG CCFL CONTRAST 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1184FCS | 功能描述:IC SW REG CCFL CONTRAST 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1184FCS#PBF | 功能描述:IC SW REG CCFL CONTRAST 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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