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參數(shù)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(shù)： | 4/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | UCC2974 |
SLUS485A
–
JULY 2001
–
REVISED NOVEMBER 2001
4
www.ti.com
electrical characteristics over recommended operating virtual junction temperature range,
T
A
= 0 C to 70 C for the UCC3974, T
A
=
–
40 C to 85 C, for the UCC2974, T
A
= T
J.
V
IN
= V
BUCK
= 12 V, MODE = OPEN (unless otherwise noted)
mode select
PARAMETER
TEST CONDITIONS
MIN
0.425
TYP
0.500
MAX
0.575
UNIT
Enable threshold voltage
Output enable threshold voltage
0.85
1.00
1.15
V
Open lamp detect enable voltage threshold
Low-frequency dimming (LFD) voltage threshold
2.75
3.8
3
3.25
4.1
4.0
MODE output current
MODE = 0.5 V
3.3
5.0
6.8
μ
A
V
MODE clamp voltage
MODE = OPEN
4.0
4.2
4.4
low-frequency dimming
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Duty cycle
RC = 400 k
,
CLFD = 10 nF,
RC = 400 k
,
CLFD = 10 nF,
RC = 400 k
,
CLFD = 10 nF
RC = 400 k
,
CLFD = 10 nF,
FLFDSYNC = 400 Hz at VLFDSYNC = 2.25 V
RD = 20 k
,
DIM < 0.5 V
6%
10%
12%
Maximum duty cycle
RD = 20 k
,
DIM > 3.1 V
100%
Free-running oscillator frequency
RD = 20 k
,
200
Synchronized oscillator frequency
RD = 20 k
,
400
Hz
open lamp
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Open lamp detect threshold voltage
VIN = 12 V,
Measured at VBUCK wrt VIN
VIN = 25 V,
Measured at VBUCK wrt VIN
Measured at VBUCK
–
8.5
–
7.8
–
7.0
–
8.6
–
7.8
–
6.9
V
Voltage clamp detect threshold voltage
NOTES:
1: Ensured by design, not production tested.
–
9.6
–
8.75
–
8.0
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