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UC2909NG4 датащи(PDF) 5 Page - Texas Instruments

номер детали UC2909NG4
подробное описание детали  Switchmode Lead-Acid Battery Charger
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производитель  TI1 [Texas Instruments]
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UC2909
UC3909
GND: The reference point for the internal reference, all
thresholds, and the return for the remainder of the de-
vice. The output sink transistor is wired directly to this
pin.
OVCTAP: The overcharge current taper pin detects
when the output current has tapered to the float thresh-
old in the overcharge state.
OSC: The oscillator ramp pin which has a capacitor (CT)
to ground. The ramp oscillates between approximately
1.0V to 3.0V and the frequency is approximated by:
frequency
CR
TSET
=
••
1
12
.
OUT: The output of the PWM driver which consists of an
open collector output transistor with 100mA sink capabil-
ity.
R10: Input used to establish a differential voltage corre-
sponding to the temperature of the thermistor. Connect
a 10k resistor to ground from this point.
RSET:
A resistor to ground programs the oscillator
charge current and the trickle control current for the oscil-
lator ramp.
The oscillator charge current is approximately
175
.
R SET
.
The trickle control current (ITRCK_CONTROL) is approxi-
mately
0115
.
R SET
.
RTHM: A 10k thermistor is connected to ground and is
thermally connected to the battery. The resistance will
vary exponentially over temperature and its change is
used to vary the internal 2.3V reference by –3.9mV/°C.
The recommended thermistor for this function is part
number L1005-5744-103-D1, Keystone Carbon Com-
pany, St. Marys, PA.
STAT0:
This open collector pin is the first decode bit
used to decode the charge states.
STAT1: This open collector pin is the second decode bit
used to decode the charge states.
STATLV: This bit is high when the charger is in the float
state.
VA–: The inverting input to the voltage error amplifier.
VAO: The output of the voltage error amplifier. The up-
per output clamp voltage of this amplifier is 5V.
VCC: The input voltage to the chip. The chip is opera-
tional between 7.5V and 40V and should be bypassed
with a 1
µF capacitor. A typical ICC vs. temperature is
shown in Figure 1.
VLOGIC: The precision reference voltage. It should be
bypassed with a 0.1
µF capacitor.
Charge State Decode Chart
STAT0 and STAT1 are open collector outputs. The out-
put is approximately 0.2V for a logic 0.
STAT1
STAT0
Trickle Charge
0
0
Bulk Charge
0
1
Over Charge
1
0
Float Charge
1
1
PIN DESCRIPTIONS (cont.)
Figure 1. ICC vs. temperature.


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