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UC2909 Fiches technique(PDF) 6 Page - Texas Instruments

No de pièce UC2909
Description  Switchmode Lead-Acid Battery Charger
Download  14 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2909 Fiches technique(HTML) 6 Page - Texas Instruments

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6
UC2909
UC3909
APPLICATION INFORMATION
A Block Diagram of the UC3909 is shown on the first
page, while a Typical Application Circuit is shown in Fig-
ure 2. The circuit in Figure 2 requires a DC input voltage
between 12V and 40V.
The UC3909 uses a voltage control loop with average
current limiting to precisely control the charge rate of a
lead-acid battery.
The small increase in complexity of
average current limiting is offset by the relative simplicity
of the control loop design.
CONTROL LOOP
Current Sense Amplifier
This amplifier measures the voltage across the sense re-
sistor RS with a fixed gain of five and an offset voltage of
2.3V. This voltage is proportional to the battery current.
The most positive voltage end of RS is connected to CS-
ensuring the correct polarity going into the PWM com-
parator.
CSO = 2.3V when there is zero battery current.
RS is chosen by dividing 350mV by the maximum allow-
able load current. A smaller value for RS can be chosen
to reduce power dissipation.
Maximum Charge Current, Ibulk, is set by knowing the
maximum voltage error amplifier output, VOH = 5V, the
maximum allowable drop across RS, and setting the re-
sistors RG1 and RG2 such that;
(1)
RG
RG
V
VLOGIC
CA
V
VV
V
V
RS
RS
RS
1
2
55
52 3
5
27
185
=
=
=
=
––
– .
.
.2
••
IRS
BULK
The maximum allowable drop across RS is specified to
limit the maximum swing at CSO to approximately 2.0V
to keep the CSO amplifier output from saturating.
No charge/load current: VCSO = 2.3V,
Max charge/load current: Vmax(CSO) = 2.3V–2.0V = 0.3V
Voltage Error Amplifier:
The voltage error amplifier (VEA) senses the battery
voltage and compares it to the 2.3V – 3.9mV/°C thermis-
tor generated reference. Its output becomes the current
command signal and is summed with the current sense
amplifier output. A 5.0V voltage error amplifier upper
clamp limits maximum load current. During the trickle
charge state, the voltage amplifier output is opened (high
impedance output) by the charge enable comparator. A
trickle bias current is summed into the CA– input which
sets the maximum trickle charge current.
The VEA, VOH = 5V clamp saturates the voltage loop
and consequently limits the charge current as stated in
Equation 1.
During the trickle bias state the maximum allowable
charge current (ITC) is similarly determined:
(2)
ITC
IRG
RS
TRICK CONTROL
=
_
1
5
ITRCK_CONTROL is the fixed control current into CA–.
ITRCK_CONTROL is 10µA when RSET = 11.5k. See RSET
pin description for equation.
Current Error Amplifier
The current error amplifier (CA) compares the output of
the current sense amplifier to the output of the voltage
error amplifier. The output of the CA forces a PWM duty
cycle which results in the correct average battery current.
With integral compensation, the CA will have a very high
DC current gain, resulting in effectively no average DC
current error. For stability purposes, the high frequency
gain of the CA must be designed such that the magni-
tude of the down slope of the CA output signal is less
than or equal to the magnitude of the up slope of the
PWM ramp.
CHARGE ALGORITHM
Refer to Figure 3 in UC3906 Data Sheet in the data
book.
A) Trickle Charge State
STAT0 = STAT1 = STATLV = logic 0
When CHGNB is less than VREF (2.3V – 3.9mV/°C),
STATLV is forced low. This decreases the sense voltage
divider ratio, forcing the battery to overcharge (VOC).
(3)
()
VOC
VREF
RS
RS
RS
RS
RS
RS
=•
++
()
()
||
123
4
34
||
During the trickle charge state, the output of the voltage
error amplifier is high impedance. The trickle control cur-
rent is directed into the CA– pin setting the maximum
trickle charge current. The trickle charge current is de-
fined in Equation 2.
B) Bulk Charge State
STAT1 = STATLV = logic 0, STAT0 = logic 1
As the battery charges, the UC3909 will transition from
trickle to bulk charge when CHGENB becomes greater
than 2.3V. The transition equation is
(4)
VT VREF
RS
RS
RS
RS
RS
RS
RS
=•
++
+
(||
)
(||
)
1234
234
STATLV is still driven low.


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