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UC2909 Datasheet

  • UC2909

  • Switchmode Lead-Acid Battery Charger

  • 10頁

  • TI

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UC2909
UC3909
Switchmode Lead-Acid Battery Charger
FEATURES
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Accurate and Efficient Control of
Battery Charging
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Average Current Mode Control from
Trickle to Overcharge
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Resistor Programmable Charge
Currents
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Thermistor Interface Tracks Battery
Requirements Over Temperature
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Output Status Bits Report on Four
Internal Charge States
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Undervoltage Lockout Monitors VCC
and VREF
DESCRIPTION
The UC3909 family of Switchmode Lead-Acid Battery Chargers accurately
controls lead acid battery charging with a highly efficient average current
mode control loop. This chip combines charge state logic with average cur-
rent PWM control circuitry. Charge state logic commands current or voltage
control depending on the charge state. The chip includes undervoltage
lockout circuitry to insure sufficient supply voltage is present before output
switching starts. Additional circuit blocks include a differential current sense
amplifier, a 1.5% voltage reference, a 鈥?.9mV/擄C thermistor linearization
circuit, voltage and current error amplifiers, a PWM oscillator, a PWM com-
parator, a PWM latch, charge state decode bits, and a 100mA open collec-
tor output driver.
BLOCK DIAGRAM
Pin numbers refer to J, N, DW packages.
UDG-95007-1
1/99

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