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ADP3810AR-126 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADP3810AR-126 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADP3810/ADP3811 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1996 Secondary Side, Off-Line Battery Charger Controllers FUNCTIONAL BLOCK DIAGRAM ADP3810/ ADP3811 VSENSE VCS COMP OUT VCC VREF GND VCTRL 1.5M Ω 80k Ω VREF UVLO GM GM1 UVLO UVLO R1 R2 ADP3810 ONLY GM2 VREF FEATURES Programmable Charge Current High Precision Battery Voltage Limit Precision 2.000 V Reference Low Voltage Drop Current Sense: 300 mV Full Scale Full Operation in Shorted and Open Battery Conditions Drives Diode-Side of Optocoupler Wide Operating Supply Range: 2.7 V to 16 V Undervoltage Lockout SO-8 Package ADP3810 Internal Precision Voltage Divider for Battery Sense Four Final Battery Voltage Options Available: 4.2 V, 8.4 V, 12.6 V, 16.8 V ADP3811 Adjustable Final Battery Voltage APPLICATIONS Battery Charger Controller for: LiIon Batteries (ADP3810) NiCad, NiMH Batteries (ADP3811) GENERAL DESCRIPTION The ADP3810 and ADP3811 combine a programmable current limit with a battery voltage limit to provide a constant current, constant voltage battery charger controller. In secondary side, off-line applications, the output directly drives the diode side of an optocoupler to give isolated feedback control of a primary side PWM. The circuitry includes two gain (gm) stages, a preci- sion 2.0 V reference, a control input buffer, an Undervoltage Lock Out (UVLO) comparator, an output buffer and an over- voltage comparator. The current limit amplifier senses the voltage drop across an external sense resistor to control the average current for charg- ing a battery. The voltage drop can be adjusted from 25 mV to 300 mV, giving a charging current limit from 100 mA to 1.2 amps with a 0.25 Ω sense resistor. An external dc voltage on the VCTRL input sets the voltage drop. Because this input is high impedance, a filtered PWM output can be used to set the voltage. As the battery voltage approaches its voltage limit, the voltage sense amplifier takes over to maintain a constant battery volt- age. The two amplifiers essentially operate in an “OR” fash- ion. Either the current is limited, or the voltage is limited. The ADP3810 has internal thin-film resistors that are trimmed to provide a precise final voltage for LiIon batteries. Four volt- age options are available, corresponding to 1-4 LiIon cells as follows: 4.2 V, 8.4 V, 12.6 V and 16.8 V. The ADP3811 omits these resistors allowing any battery volt- age to be programmed with external resistors. |
Podobny numer części - ADP3810AR-126 |
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Podobny opis - ADP3810AR-126 |
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