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| 型号： | 5962-9462201MVA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | FLUORESCENT LIGHT CONTROLLER, 78 kHz SWITCHING FREQ-MAX, CDIP18 |
| 封装： | CERAMIC, DIP-18 |
| 文件页数： | 10/14页 |
| 文件大小： | 848K |
| 代理商： | 5962-9462201MVA |
A unique protection feature incorporated in the UC3871
is the Open Lamp Detect circuit. An open lamp interrupts
the current feedback loop and causes very high secon-
dary voltage. Operation in this mode will usually break-
down the transformer’s insulation, causing permanent
damage to the converter. The open lamp detect circuit,
shown in Figure 3 senses the lamp current feedback sig-
nal at the error amplifiers input, and shuts down the out-
puts if insufficient signal is present. Soft-start circuitry
limits initial turn-on currents and blanks the open lamp
detect signal.
Other features are included to minimize external circuitry
requirements. A logic level enable pin shuts down the IC,
allowing direct connection to the battery. During shut-
down, the IC typically draws less than 1
A. The UC3871,
operating from 4.5V to 20V, is compatible with almost all
battery voltages used in portable computers. Under-volt-
age lockout circuitry disables operation until sufficient
supply voltage is available, and a 1% voltage reference
insures accurate operation. Both inputs to the LCD sup-
ply error amplifier are uncommitted, allowing positive or
negative supply loop closure without additional circuitry.
The LCD supply modulator also incorporates cycle-by-
cycle current limiting for added protection.
Figure 3
UC1871
UC2871
UC3871
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX (603) 424-3460
APPLICATION INFORMATION (cont.)
Figure 2
UC1871 Open Lamp Detect Circuitry
UC3871 Oscillator Section
5
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