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UC2872N Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce UC2872N
Description  Resonant Lamp Ballast Controller
Download  11 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2872N Fiches technique(HTML) 5 Page - Texas Instruments

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5
UC1872
UC2872
UC3872
Figure 1. Typical application.
UDG-93018-2
A unique protection feature incorporated in the UC3872
is the Open Lamp Detect circuit. An open lamp interrupts
the current feedback loop and causes very high second-
ary 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 amplifier’s 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 a battery. During shut-
down, the IC typically draws less than 1
µA. The UC3872,
operating from 4.5V to 24V, is compatible with almost all
battery voltages used in portable computers and auto-
motive applications. Undervoltage lockout circuitry dis-
ables
operation
until
sufficient
supply
voltage
is
available, and a 1% voltage reference insures accurate
operation.
APPLICATION INFORMATION (cont.)


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