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UC2909 Datasheet(PDF) 1 Page - Texas Instruments |
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UC2909 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 14 page UC2909 UC3909 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 –3.9mV/°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. Switchmode Lead-Acid Battery Charger FEATURES • Accurate and Efficient Control of Battery Charging • Average Current Mode Control from Trickle to Overcharge • Resistor Programmable Charge Currents • Thermistor Interface Tracks Battery Requirements Over Temperature • Output Status Bits Report on Four Internal Charge States • Undervoltage Lockout Monitors VCC and VREF 1/99 BLOCK DIAGRAM UDG-95007-1 Pin numbers refer to J, N, DW packages. |
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