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参数资料
| 型号： | ADP3810 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Secondary Side, Off-Line Battery Charger Controllers(电池充电控制器) |
| 中文描述： | 二次侧，离线电池充电器控制器（电池充电控制器） |
| 文件页数： | 11/16页 |
| 文件大小： | 403K |
| 代理商： | ADP3810 |
ADP3810/ADP3811
–11–
REV. 0
10
0%
100
90
50msec/DIV
2V/DIV
10V
6V
T
A
= +25
8
C
V
IN
= 220V
AC
V
CTRL
= 1V
0V
Figure 27. Output Voltage Transient Response to Battery
Connect/Disconnect
NONISOLATED TOPOLOGIES
Buck Switching Regulators
The ADP3810/ADP3811 and the ADP1148 can be combined
to create a high efficiency buck regulator battery charger as
shown in Figure 28. The ADP1148 is a high efficiency, synchro-
nous, step-down regulator that controls two external MOSFETs
as shown. Similar to the previous flyback circuit, the ADP3810
controls the average charge current and the final battery voltage,
and the ADP1148 controls the cycle by cycle current. The fol-
lowing discussion explains the functionality of the circuit but
does not go into detail on the ADP1148. For more information,
the ADP1148 data sheet details the operation of the device and
gives formulas for choosing the external components.
The resistor R
SENSE
sets the cycle by cycle current limit to 1.5 A,
which is far enough above the 1 A average current of the
ADP3810 loop to avoid interfering but still provides a safe
maximum current to protect the external components. The
ADP3810 uses a 0.25
resistor, R
CS
, to sense the battery cur-
rent. As before, a 20 k
resistor is needed between R
CS
and the
V
CS
input of the ADP3810. The RC network from V
CS
to ground
performs the dual function of filtering and compensation.
The voltage loop directly senses the battery voltage. Since the
ADP3810 is used in this circuit instead of the ADP3811, V
SENSE
is connected directly to the battery. The internal resistors set the
battery voltage to 8.4 V in this case. Of course, other voltage
options could be used, or the ADP3811 could be substituted
with external resistors for a user set voltage. Notice the two
grounds in the circuit. One ground is for the high current re-
turn to the V
IN
source and the other ground for the ADP3810
circuitry. R
CS
separates the two grounds, and it is important to
keep them separate as shown.
The adjustable version of the ADP1148 is used in this circuit in-
stead of a fixed output version. The output voltage is fed back
into the V
FB
pin, which is set to regulate at V
BAT MAX
+ 0.5 V.
Doing so provides a secondary, higher voltage limit without
interfering with normal circuit operation. The control output of
the ADP3810 is connected through a 560
resistor to the
SENSE+ input of the ADP1148. The current, I
OUT
, adjusts the
dc level on the SENSE+ pin, which is added to the current
ramp across R
SENSE
. Higher I
OUT
increases the voltage on
SENSE+ and reduces the duty cycle of the 1148, giving nega-
tive feedback.
The circuit as shown can quickly and safely charge LiIon batter-
ies while maintaining high efficiency. The efficiency of the
ADP1148 is only degraded slightly by the addition of the
ADP3810 and external circuitry. The 1.5 mA of supply current
lowers the overall efficiency by approximately 1%–2% for maxi-
mum output current. The 0.25
sense resistor further lowers
the efficiency due to the I
2
×
R
CS
power loss at high output cur-
rents. See the efficiency discussion in the ADP1148 data sheet
for more information.
Linear Regulator
A third charging circuit is shown in Figure 29. In this case, the
switching supply is replaced with a linear regulator. The ADP3811
drives the gate of an N-channel MOSFET using an external
2N3904. As before, the ADP3811 senses the charge current
through a 0.25
resistor. When the current increases above the
limit, the internal GM amplifier causes the output to go high.
This puts more voltage across R8, increasing the current in Q1.
As the current increases, the gate of M1 is pulled lower, reduc-
ing the gate to source voltage and decreasing the charge current
to complete the feedback loop. Because the ADP3811 has a
current output, an external 1 k
resistor is needed from the
OUT pin to ground in order to convert the current to a voltage.
20k
100
R
C1
2k
C
C1
1μF
R
**
50 m
C
100μF
0.1μF
C
T
68pF
0.1μF
C
220nF
* COILTRONICS CTX-68-4
** KRL SL-1-C1-0R068J
0.1μF
V
CC
V
SENSE
+V
IN
GND
V
CS
V
REF
V
CTRL
COMP
OUT
ADP3810
V
(0V TO 1V)
REF & CTRL
RTN
R
C2
560
SHUTDOWN
V
FB
P DRIVE
V
IN
SENSE+
SENSE–
N DRIVE
S GND
P GND
C
T
1000pF
N CH
IRF7403
P CH
IRF7204
0V = NORMAL
>1.5V = SHUTDOWN
560
L*
62μH
C
OUT
220μF
100
BATTERY
V
BAT
1μF
V
REF
V
IN
RTN
ADP1148
D1
10BQ040
R
CS
0.25
75k
10
k
Figure 28. High Efficiency Buck Battery Charger
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3810AR-12.6 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:OFF LINE BATTERY CHARGER SMD 3810 |
| adp3810ar-12.6-rl7 | 制造商:Rochester Electronics LLC 功能描述:OFF-LINE BATTERY CHARGER CONTRLR-12.6V - Tape and Reel 制造商:Analog Devices 功能描述: |
| ADP3810AR-126 | 制造商:AD 制造商全称:Analog Devices 功能描述:Secondary Side, Off-Line Battery Charger Controllers |
| ADP3810AR-16.8 | 制造商:Analog Devices 功能描述:Battery Charger 6mA 16.8V 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADP3810AR-168 | 制造商:AD 制造商全称:Analog Devices 功能描述:Secondary Side, Off-Line Battery Charger Controllers |
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