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| 型号： | LT1511ISW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST I/V 3A24SOIC |
| 标准包装： | 32 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 管件 |
LT1511
APPLICATIO N S I N FOR M ATIO N
capacitor. A resistor divider is used to set the desired V CC
lockout voltage as shown in Figure 2. A typical value for R6
is 5k and R5 is found from:
being charged without complex load management algo-
rithms. Additionally, batteries will automatically be charged at
the maximum possible rate of which the adapter is capable.
R5 =
R6(V IN – V UV )
V UV
This feature is created by sensing total adapter output
current and adjusting charging current downward if a
preset adapter current limit is exceeded. True analog
V UV = Rising lockout threshold on the UV pin
V IN = Charger input voltage that will sustain full load power
Example: With R6 = 5k, V UV = 6.7V and setting V IN at 12V;
R5 = 5k (12V – 6.7V)/6.7V = 4k
The resistor divider should be connected directly to the
adapter output as shown, not to the V CC pin to prevent
battery drain with no adapter voltage. If the UV pin is not
used, connect it to the adapter output (not V CC ) and
connect a resistor no greater than 5k to ground. Floating
the pin will cause reverse battery current to increase from
3 μ A to 200 μ A.
control is used, with closed loop feedback ensuring that
adapter load current remains within limits. Amplifier CL1
in Figure 2 senses the voltage across R S4 , connected
between the CLP and CLN pins. When this voltage exceeds
100mV, the amplifier will override programmed charging
current to limit adapter current to 100mV/R S4 . A lowpass
filter formed by 500 ? and 1 μ F is required to eliminate
switching noise. If the current limit is not used, both CLP
and CLN pins should be connected to V CC .
Charging Current Programming
The basic formula for charging current is (see Block
Diagram):
( ) (
R S2
)( )
If connecting the unused UV pin to the adapter output is
not possible for some reason, it can be grounded. Al-
though it would seem that grounding the pin creates a
permanent lockout state, the UV circuitry is arranged for
I BAT = I PROG
R S1
=
2.465V
R PROG
R S2
R S1
phase reversal with low voltages on the UV pin to allow the
grounding technique to work.
where R PROG is the total resistance from PROG pin to ground.
For the sense amplifier CA1 biasing purpose, R S3 should
+
CL1
–
LT1511
100mV
+
CLP
CLN
V CC
+
1 μ F
500 ?
R S4 *
AC ADAPTER
OUTPUT
V IN
R5
have the same value as R S2 and SPIN should be connected
directly to the sense resistor (R S1 ) as shown in the Block
Diagram.
For example, 3A charging current is needed. To have low
power dissipation on R S1 and enough signal to drive the
amplifier CA1, let R S1 = 100mV/3A = 0.033 ? . This limits
R S1 power to 0.3W. Let R PROG = 5k, then:
UV
R S2 = R S3 = BAT
*R S4 =
100mV
ADAPTER CURRENT LIMIT
R6
(I
)(R PROG )(R S1 )
2.465V
= = 200 ?
1511 ? F02
Figure 2. Adapter Current Limiting
Adapter Limiting
An important feature of the LT1511 is the ability to
automatically adjust charging current to a level which
avoids overloading the wall adapter. This allows the
product to operate at the same time that batteries are
10
(3A)(5k)(0.033 )
2.465V
Charging current can also be programmed by pulse width
modulating I PROG with a switch Q1 to R PROG at a frequency
higher than a few kHz (Figure 3). Charging current will be
proportional to the duty cycle of the switch with full current
at 100% duty cycle.
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