ADP3810AR-12.6 Analog Devices, ADP3810AR-12.6 Datasheet

no-image

ADP3810AR-12.6

Manufacturer Part Number
ADP3810AR-12.6
Description
Manufacturer
Analog Devices
Datasheet
a
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,
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.
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
ADP3811
APPLICATIONS
Battery Charger Controller for:
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
Adjustable Final Battery Voltage
LiIon Batteries (ADP3810)
NiCad, NiMH Batteries (ADP3811)
V
CTRL
V
REF
1.5M
GND
OUT
UVLO
80k
GM
FUNCTIONAL BLOCK DIAGRAM
V
CS
GM1
UVLO
UVLO
V
CC
ADP3810/
ADP3811
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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 (g
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
on the V
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.
V
REF
Battery Charger Controllers
CTRL
V
REF
input sets the voltage drop. Because this input
Secondary Side, Off-Line
V
SENSE
GM2
R1
World Wide Web Site: http://www.analog.com
R2
ADP3810/ADP3811
sense resistor. An external dc voltage
ADP3810
ONLY
COMP
© Analog Devices, Inc., 1996
m
) stages, a preci-

Related parts for ADP3810AR-12.6

ADP3810AR-12.6 Summary of contents

Page 1

... REF V CTRL 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. ...

Page 2

ADP3810/ADP3811–SPECIFICATIONS Parameter 1 CURRENT SENSE Full-Scale Current Sense Voltage Minimum Current Sense Voltage Current Programming Input Range Gain ( OUT CS Control Input Bias Current VOLTAGE SENSE 2 Accuracy —ADP3810 Input Resistance—ADP3810 Input Resistance—ADP3810 Input Resistance—ADP3810 Input Resistance—ADP3810 ...

Page 3

... Operating Temperature Range . . . . . . . . . . . – +85 C Storage Temperature Range . . . . . . . . . . . . . – 150 C Lead Temperature (Soldering, 10 sec +300 C ORDERING GUIDE Temperature Model Range ADP3810AR-4.2 – +85 C ADP3810AR-8.4 – +85 C ADP3810AR-12.6 – +85 C ADP3810AR-16.8 – +85 C ADP3811AR – +85 C DC/ CONVERTER ...

Page 4

ADP3810/ADP3811 –Typical Performance Characteristics 2.004 V = +10V CC 2 TYPICAL PARTS I = 100µA L 2.002 C = 0.1µF L 2.000 1.998 1.996 1.994 –50 – 100 TEMPERATURE – C Figure 2. Reference Output Voltage ...

Page 5

C = 0.01µF COMP + GAIN V = +10V PHASE –20 135 –40 180 –60 225 10 100 1k 10k 100k 1M FREQUENCY – Hz Figure ...

Page 6

ADP3810/ADP3811 240 V = +10V + 200 160 120 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 6.8 7.0 OUTPUT GAIN ( – V/V OUT ...

Page 7

I reduces the duty cycle of the dc-dc OUT converter and causes the battery voltage to fall, balancing the feedback loop. Each GM stage is designed to be asymmetrical so that each am- plifier can only ...

Page 8

ADP3810/ADP3811 charge current levels can be obtained by either reducing the value increasing the value of R3. The main penalty of CS increasing R3 is lower efficiency due to the larger voltage drop across R , and ...

Page 9

120/220V– N COMP 3.3k 1nF V FB 3.3k PWM 3845 RT/ TOLERANCE 3.3k ** TX1 f = 120kHz L = 750µH 2.2nF 7.5µH SEC Figure ...

Page 10

ADP3810/ADP3811 battery voltage is at least 1.5 V with a programmed charge cur- rent of 0.1 A. For a higher programmed charge current, the battery voltage can drop below 1.5 V, and V above 2.7 V. This is because of ...

Page 11

T = +25 C 100 220V CTRL 10V 2V/DIV 0V Figure 27. Output Voltage Transient Response to Battery Connect/Disconnect NONISOLATED TOPOLOGIES Buck Switching Regulators The ADP3810/ADP3811 and the ...

Page 12

ADP3810/ADP3811 + 80.6k V REF V CTRL R2 20k V & CTRL V RTN REF V IN RTN Figure 29. ADP3811 Controlling a Linear Battery Charger The trade-off between using a linear regulator as shown versus using a ...

Page 13

POWER STAGE COMP 0.33V VOLTAGE ERROR AMPLIFIER Figure 31. Block Diagram of the Linearized Feedback Model amplifiers are represented by voltage controlled current sources, the optocoupler by a current ...

Page 14

ADP3810/ADP3811 either present or absent. If the battery is present, its large ca- pacitance creates a very low frequency dominant pole, giving a single pole system. The more demanding case is when the bat- tery is removed. Now the output ...

Page 15

Step 9. Iterate Because f is very close will increase the error ampli fier gain in a nonnegligible amount at the 0 dB point. The in- crease in gain is calculated ...

Page 16

ADP3810/ADP3811 Step 14. Calculate value realize G C2 Assuming that short, R forms a resistor divider with C2 C2 R3, reducing the loop gain. To calculate R tor ratio to give an attenuation of ...

Related keywords