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参数资料
| 型号： | LM3647IMX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封装： | PLASTIC, SOIC-20 |
| 文件页数： | 10/14页 |
| 文件大小： | 271K |
| 代理商： | LM3647IMX |
4.0 Functional Description
4.1 GENERAL
The LM3647 can be configured to charge three different
types of batteries: Ni-Cd, Ni-MH and Li-Ion. The charger
behavior for Ni-Cd and Ni-MH is similar but the charge
curves will appear slightly different due to the differences in
chemistry. The Ni-Cd/Ni-MH charging algorithm is divided
into four phases:
Soft Start:
The LM3647 detects that a battery is con-
nected and optionally verifies that the tem-
perature is within safe operating limits (ap-
prox. 5C to +50C). Charging starts with a
current of 0.2C and switches into the next
phase after approx. 5 minutes. Error termina-
tion will be triggered by Maximum Battery
Voltage (CEL-pin > 3.017V) or if the battery
voltage does not reach the defective battery
level (CEL-pin < 1.2V).
Fast Charge: Constant current is applied to the battery and
the LM3647 monitors voltage and tempera-
ture (optional). Switching into the next phase
will appear after a voltage drop in the charg-
ing curve: Ni-Cd
50 mV/cell and Ni-MH 17
mV/cell. Error termination will be triggered by
over-temperature.
Topping
Charge:
A current of 0.2C is applied to the battery for
a user defined time (RC network at SEL4).
Maintenance Charge:
Is user selectable and is a fixed percentage
of the Fast Charge rate. Discharge before
charge is user selectable.
Ni-Cd Charging Curve:
10131803
Ni-MH Charging Curve:
10131804
The Li-Ion charging algorithm is also divided into four
phases:
Qualification: The LM3647 detects that a battery is con-
nected and verifies that the temperature (optional but
highly recommended for safety reasons) is within limit.
Charging starts with a current of 0.2C and switches into
next phase after approx. 1 minute. Error termination will
be triggered if the battery voltage does not reach the
Li-Ion battery qualification level (CEL-pin < 1.2V) within
one minute.
Fast Charge Constant Current: Battery voltage will rise
until Maximum Battery Voltage (CEL-pin = 2.675V or
2.74V depending on SEL3) is reached.
Fast Charge Constant Voltage: Keeps the voltage con-
stant until the current has decreased below the threshold
(CS at 2.3V).
Maintenance Charge: Is user selectable and is a fixed
percentage of the Fast Charge rate.
10131805
4.2 ADVANCED PIN DESCRIPTIONS
SEL1 is a selection pin to control the LM3647 discharge and
maintenance charge modes. The pin has three states: tied to
V
CC, GND, or unconnected (Hi-Z). When the charger is
configured to charge Ni-Cd or Ni-MH batteries, this pin de-
termines if the charger discharges the battery before charg-
ing or if the charger shall only maintenance charge the
battery. When the charger is configured for Li-Ion batteries,
this pin determines how the charger behaves during main-
tenance charge.
SEL1
Charge mode
condition SEL2 = GND (NiCd) or V
CC
(NiMH)
V
CC
No discharge before charge
GND
Maintenance charge only (no fast charge)
Open
Discharge before charge
SEL1
Charge mode
condition SEL2 = Open (Li-Ion)
V
CC
Maintenance charge indefinite
GND
Maintenance charge indefinite, restart
fast-charge if battery gets discharged (load
connected)
Open
No maintenance charge, restart fast charge
if battery becomes discharged
SEL2 is a selection pin to determine the battery type to be
charged. The pin has three states: tied to V
CC (Ni-MH), GND
(Ni-Cd), or unconnected (Li-Ion).
SEL2
Battery Type Select
V
CC
Ni-MH
GND
NiCd
Open
Li-Ion
SEL3 is a selection pin used to set charger hardware modes.
The pin has two states: tied to V
CC or GND. When the
LM3647 is configured for Ni-Cd/Ni-MH batteries, this pin
selects between a power supply with current feedback when
LM3647
www.national.com
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