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ADP3810AR-84 の電気的特性と機能

ADP3810AR-84のメーカーはAnalog Devicesです、この部品の機能は「Secondary Side/ Off-Line Battery Charger Controllers」です。


製品の詳細 ( Datasheet PDF )

部品番号 ADP3810AR-84
部品説明 Secondary Side/ Off-Line Battery Charger Controllers
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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ADP3810AR-84 Datasheet, ADP3810AR-84 PDF,ピン配置, 機能
a
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,
Secondary Side, Off-Line
Battery Charger Controllers
ADP3810/ADP3811
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 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.
GND
FUNCTIONAL BLOCK DIAGRAM
VCS
VCC
VREF VSENSE
VREF
1.5M
80k
VCTRL
UVLO
GM
UVLO
UVLO
VREF
GM1 ADP3810/
ADP3811
R1
ADP3810
ONLY
R2
GM 2
COMP
OUT
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.
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

1 Page





ADP3810AR-84 pdf, ピン配列
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . –0.4 V to 18 V
VCTRL, VCS Input Range . . . . . . . . . . . . . . . . . . –0.4 V to VCC
VSENSE Input Range (ADP3811) . . . . . . . . . . . . –0.4 V to VCC
VSENSE Input Range (ADP3810) . . . . . . . . . . . –0.4 V to 20 V
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
ORDERING GUIDE
Model
Temperature Package Battery
Range
Option Voltage
ADP3810AR-4.2
ADP3810AR-8.4
ADP3810AR-12.6
ADP3810AR-16.8
ADP3811AR
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
SO-8
SO-8
SO-8
SO-8
SO-8
4.2 V
8.4 V
12.6 V
16.8 V
Adjustable
ADP3810/ADP3811
PIN CONFIGURATION
VSENSE 1
VCS 2
ADP3810
ADP3811
8 VCC
7 VREF
COMP 3 TOP VIEW 6 GND
(Not to Scale)
OUT 4
5 VCTRL
PIN DESCRIPTION
Mnemonic Function
VSENSE
VCS
VREF
COMP
OUT
VCTRL
VCC
GND
Battery Voltage Sense Input.
Current Sense Input.
Reference Output. Nominally 2.0 V.
External Compensation Pin.
Optocoupler Current Output Drive.
DC Control Input to Set Current Limit, 0 V to 1.2 V.
Positive Supply.
Ground Pin.
OUT
VIN
IN
DC/DC
CONVERTER
RETURN
VRCS
CTRL
GND
R3
0.1µF
RCS
VBAT
ICHARGE
2.0V
0.1µF
R1 ADP3811
ONLY
R2
VCTRL
VREF
1.5M
VCS
80k
VCC
UVLO
UVLO
IOUT
BUFFER
GM1
ADP3810/
ADP3811
OUT
UVLO
GM 3
200
1.2V
VREF
VREF
VSENSE
R1 ADP3810
ONLY
R2
GM 2
100µA
COMP
CC
RC
GND
BATTERY
Figure 1. Simplified Battery Charger
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP3810/ADP3811 features proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–


3Pages


ADP3810AR-84 電子部品, 半導体
ADP3810/ADP3811
240
VCC = +10V
200
TA = +25°C
RL = 1k
160
120
80
40
0
5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 6.8 7.0
OUTPUT GAIN (VOUT/VCOMP) – V/V
Figure 20. Output Gain (VOUT/VCOMP)
Distribution
8
RL = 1k
VOUT = +1.0V
7
TA = –40°C
6
5 TA = +85°C
TA = +25°C
4
3
036
9 12 15 18
VCC – Volts
Figure 21. Output Gain (VOUT/VCOMP)
vs. VCC
0.25
0.20
VCC = +10V
ILOAD = 5mA
0.15
0.10
0.05
0
–50 –25
0
25 50 75 100
TEMPERATURE – °C
Figure 22. VSAT vs. Temperature
APPLICATIONS SECTION
Functional Description
The ADP3810 and ADP3811 are designed for charging NiCad,
NiMH and LiIon batteries. Both parts provide accurate voltage
sense and current sense circuitry to control the charge current
and final battery voltage. Figure 1 shows a simplified battery
charging circuit with the ADP3810/ADP3811 controlling an
external dc-dc converter. The converter can be one of many
different types such as a Buck converter, Flyback converter or a
linear regulator. In all cases, the ADP3810/ADP3811 maintains
accurate control of the current and voltage loops, enabling the
use of a low cost, industry standard dc-dc converter without
compromising system performance. Detailed realizations of
complete circuits including the dc-dc converter are included
later in this data sheet.
The ADP3810 and ADP3811 contain the following blocks
(shown in Figure 1):
• Two “GM” type error amplifiers control the current loop
(GM1) and the voltage loop (GM2).
• A common COMP node is shared by both GM amplifiers
such that an RC network at this node helps compensate both
control loops.
• A precision 2.0 V reference is used internally and is available
externally for use by other circuitry. The 0.1 µF bypass ca-
pacitor shown is required for stability.
• A current limited buffer stage (GM3) provides a current out-
put, IOUT, to control an external dc-dc converter. This out-
put can directly drive an optocoupler in isolated converter
applications. The dc-dc converter must have a control scheme
such that higher IOUT results in lower duty cycle. If this is
not the case, a simple, single transistor inverter can be used
for control phase inversion.
• An amplifier buffers the charge current programming volt-
age, VCTRL, to provide a high impedance input.
• An UVLO circuit shuts down the GM amplifiers and the
output when the supply voltage (VCC) falls below 2.7 V. This
protects the charging system from indeterminate operation.
• A transient overshoot comparator quickly increases IOUT
when the voltage on the “+” input of GM2 rises over 120 mV
above VREF. This clamp shuts down the dc-dc converter to
quickly recover from overvoltage transients and protect ex-
ternal circuitry.
Description of Battery Charging Operation
The IC based system shown in Figure 1 charges a battery with a
dc current supplied by a dc-dc converter, which is most likely a
switching type supply but could also be a linear supply where
feasible. The value of the charge current is controlled by the
feedback loop comprised of RCS, R3, GM1, the external dc-dc
converter and a dc voltage at the VCTRL input. The actual
charge current is set by the voltage, VCTRL, and is dependent
upon the choice for the values of RCS and R3 according to the
formula below:
ICHARGE
=1
RCS
×
R3
80 k
×V
CTRL
Typical values are RCS = 0.25 and R3 = 20 k, which result
in a charge current of 1.0 A for a control voltage of 1.0 V. The
80 kresistor is internal to the IC, and it is trimmed to its ab-
solute value. The positive input of GM1 is referenced to
ground, forcing the VCS pin to a virtual ground.
The resistor RCS converts the charge current into the voltage at
VRCS, and it is this voltage that GM1 is regulating. The voltage
at VRCS is equal to –(R3/80 k) VCTRL. When VCTRL equals
1.0 V, VRCS equals –250 mV. If VRCS falls below its pro-
grammed level (i.e., the charge current increases), the negative
input of GM1 goes slightly below ground. This causes the out-
put of GM1 to source more current and drive the COMP node
high, which forces the current, IOUT, to increase. A higher IOUT
decreases the drive to the dc-dc converter, reducing the charg-
ing current and balancing the feedback loop.
As the battery approaches its final charge voltage, the voltage
loop takes over. The system becomes a voltage source, floating
the battery at constant voltage thereby preventing overcharging.
The constant voltage feature also protects the circuitry that is
actually powered by the battery from overvoltage if the battery is
removed. The voltage loop is comprised of R1, R2, GM2 and
the dc-dc converter. The final battery voltage is simply set by
the ratio of R1 and R2 according to the following equation
(VREF = 2.000 V):
V BAT
= 2.000V
×

R1
R2
+
1
If the battery voltage rises above its programmed voltage,
VSENSE is pulled above VREF. This causes GM2 to source more
current, raising the COMP node voltage and IOUT. As with the
–6– REV. 0

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部品番号部品説明メーカ
ADP3810AR-84

Secondary Side/ Off-Line Battery Charger Controllers

Analog Devices
Analog Devices


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