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UCC2305DW Datasheet(PDF) 6 Page - Texas Instruments

Part # UCC2305DW
Description  HID Lamp Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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UCC2305DW Datasheet(HTML) 6 Page - Texas Instruments

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UCC2305
UCC3305
ated by a voltage doubler using the PUMPOUT pin as
an AC signal and external diodes as switches.
PUMP-OUT is a square wave which swings from VCC
to GND at half of the OSC frequency.
PWMOUT: The output of the pulse width modulator is a
command signal to a power MOSFET switch. This sig-
nal
appears
on
PWMOUT.
In
normal
systems,
PWM-OUT can be directly connected to the gate of an
N-channel power MOSFET such as the IRF540. If the
lead between the UCC3305 and the MOSFET is longer
than a few cm, a 10 ohm resistor from PWMOUT to
gate may be required to dampen overshoot and under-
shoot.
QOUT: The UCC3305 is immediately configured for DC
HID lamps. To operate with AC HID lamps, it is neces-
sary to add a power H-bridge which will toggle lamp
voltage. A practical switching frequency for this toggle
function is the OSC frequency divided by 512, or 192Hz
for a 100kHz oscillator.
The QOUT pin is a logic output which toggles at the
OSC frequency divided by 512, 180 degrees out of
phase with the QOUT pin.
QOUT: The QOUT pin is a logic output which toggles at
the OSC frequency divided by 512, 180 degrees out of
phase with the QOUT pin.
SLOPEC: To track lamp warm-up and cool down, two
capacitors connected to the UCC3305 charge and dis-
charge. One is connected to SLOPEC. The other is con-
nected to WARMUPC. The capacitor connected to
SLOPEC charges up to 5V with a rate controlled by the
resistor from ISET to GND. With a nominal 100k ISET
resistor the charging current into SLOPEC is equivalent
to the current from a 50Meg resistor to 5V.
When power is removed from VCC, SLOPEC dis-
charges at a constant current, nominally 100nA.
VCC: VCC is the main supply input to the UCC3305.
Many functions in the UCC3305 are powered by VCC,
while others are powered by BOOST. VCC should be
clamped to 6.8V by an external zener diode and kept as
close to 6.8V as practical with a low value resistor to the
input supply.
VOUT-SENSE: The VOUTSENSE input is used to
sense lamp voltage, commonly through a 120:1 voltage
divider. For a normal, running HID lamp, the voltage
across the lamp is between 60V and 110V. It takes
higher than 300V to break down the lamp, and it is de-
sirable to limit the voltage on the starter input to 600V
maximum. A lamp voltage less than 10V is indicative of
a shorted lamp.
The UCC3305 regulates lamp power by commanding
the correct lamp current for a given lamp voltage. In ad-
dition, a comparator in the UCC3305 terminates a PWM
cycle if VOUTSENSE reaches 5V, corresponding to
600V on the lamp. This regulates lamp voltage at 600V
when the lamp is not lit. Comparators in the UCC3305
also compare VOUTSENSE to 83mV corresponding to
10V lamp voltage and 2V, corresponding to a 240V
lamp voltage. When the VOUTSENSE voltage is out-
side this window, the lamp is either not lit, shorted, or
open.
WARMUPC: In addition to the capacitor from SLOPEC
to GND, lamp temperature is estimated by the voltage
on a capacitor from WARMUPC to GND. This capacitor
is charged by a 200nA current source to 4.2V and by a
100nA current source from 4.2V to 10V when the lamp
is on, and discharged by 39nA current sink to 2.5V and
11nA current sink to GND when the lamp is off.
WARMUPV: The voltage on WARMUPC is used to
modulate the signal fed to the error amplifier through
FB. However, the impedance on WARMUPC is too high
to be directly used. The UCC3305 contains a buffer am-
plifier which buffers the voltage on WARMUPC and pro-
cesses it to WARMUPV, making a signal appropriate for
driving FB.
PIN DESCRIPTIONS (cont.)
APPLICATIONS INFORMATION
Typical Application
This circuit shows the UCC3305 HID Lamp Controller IC
in a flyback converter. The output of the converter is reg-
ulated at constant power, so that lamp intensity is rela-
tively constant regardless of small lamp manufacturing
variations.
Full Bridge Output Stage
The output of the flyback converter is directed to the AC
lamp through a full bridge inverter. The full bridge is
switched at a low frequency (typically 195Hz), so that the
average lamp voltage is zero. The low frequency switch-
ing is derived from the PWM oscillator. It is desirable to
switch lamp polarity when running, but switching lamp
polarity can interfere with clean starting. The UCC3305
has a logic output called NOTON which is high when the
lamp is not running (Not On) and low when the lamp is
running. This output is connected to the DIVPAUSE input
so that the low frequency switching stops until the lamp
is fully lit.
The UCC3305 HID Controller IC has two low frequency
outputs, QOUT and QOUT. These outputs are capable of
driving low-side MOSFETs directly at 195Hz, but
high-side MOSFETs require a level-shifted drive. This


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