ADP3810AR-12.6 Просмотр технического описания (PDF) - Analog Devices

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ADP3810AR-12.6

Secondary Side, Off-Line Battery Charger Controllers

Analog Devices 

~ ANALOG

W DEVICES

SecondarySide,Off-Line

BatteryChargerControllers

ADP381~DP3811

I

FEATURES

off-line applications, the output directly drives the diode side of

Programmable Charge Current

an optocoupler to give isolated feedback control of a primary

High Precision Battery Voltage Limit

Precision 2.000 V Reference

side PWM. The circuitry includes two gain (grJ stages, a preci-

sion 2.0 V reference, a control input buffer, an Undervoltage

Low Voltage Drop Current Sense: 300 mV Full Scale

Lock Out (UVLO) comparator, an output buffer and an over-

Full Operation in Shorted and Open Battery Conditions

voltage comparator.

OBSOLETE 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:

Lilon 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,

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 mY, giving a charging current limit from 100 mA to

1.2 amps with a 0.25 .Qsense resistor. An external dc voltage

on the VCTRLinput 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.

GND

FUNCTIONAL BLOCK DIAGRAM

Vcs

VCC

VREF VSENSE

1.5MQ

VREF

80kQ

VCTRL

UVLO

ADP3810/

ADP3811

OUT

CaMP

REV.O

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.

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

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