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參數資料
| 型號： | UCC2974 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL COLD CATHODE FLUORESCENT LAMP CONTROLLER |
| 中文描述： | 雙冷陰極熒光燈控制器 |
| 文件頁數： | 6/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | UCC2974 |
SLUS485A
–
JULY 2001
–
REVISED NOVEMBER 2001
6
www.ti.com
APPLICATION INFORMATION
functional block diagram
UDG
–
01021
3
+
+
+
VIN
OPEN LAMP
DETECTOR
ZERO DETECTOR
VOLTAGE CLAMP
OSCILLATOR
4
–
BIT
COUNTER
AND LOGIC
SYNC
VDRV
1
S
Q
Q
R
R DOMINANT
LFD
–
PWM
UVLO
OPEN LAMP
OE
VINT
5
+
+
EA1
UVLO
S
Q
Q
R
SD
OPEN LAMP
OVERFLOW
INTERNAL REGULATOR
VREG UVLO
1.5
1.0
VIN
13
2
VIN
CBP
BUCK1
OUT1
FB1
SAME
AS
OTHER
CHANNEL
MODE SELECT
L
–
E
S
O
O
10
MODE
5
μ
A
VINT
14 BUCK2
16 OUT2
11 FB2
+
+
1.5
LFD OSCILLATOR
& LOGIC
LFD
–
PWM
4
COMP1
PRE
–
CON
6
RT1
7
RT2
9
DIM
8
LFDSYNC
1.0
LFD SECTION
12 COMP2
40 kHz TO 200 kHZ
LFD
–
EN
general description
The UCC3974 extends the capabilities of the UCC3972 and UCC3973 backlight controllers. The basic
functionality is the same as that for the UCC3972; a buck controlled current source feeding a royer oscillator
CCFL circuit. As such the application information for the UCC3972 that pertains to the royer oscillator, buck
controller and CCFL circuit in general apply to the UCC3974. Also, this device implements a voltage clamping
scheme, similar to that of the UCC3973, using an internal current source to bias up the FB pin and thereby
limiting the current available to the royer stage. This limits the voltage to which the secondary side of the
transformer is exposed.
The extensions this device provides are two separately controlled channels to be used with two separate royer
stages, and integrated low-frequency dimming (LFD) control .
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UCC2974PW | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| UCC2975PW | 功能描述:LCD 驅動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| UCC2975PWG4 | 功能描述:LCD 驅動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| UCC2976PW | 功能描述:LCD 驅動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| UCC2976PWG4 | 功能描述:LCD 驅動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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