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LM3647IM Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM3647IM
Description  Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries
PDF  17 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3647IM Datasheet(HTML) 9 Page - National Semiconductor (TI)

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Slow PWM-mode:
The PWM-pin turns the external current source on and off at
a rate of 0.1Hz. (This example is just one of many possible
design solutions.) The PWM-pin (SLOW_PWM) turns the
transistor Q1 on and off. When the transistor is off the current
source is on, and when the transistor is on the current source
is off (V_OUT at approximate 0.7V). The value of R1 de-
pends on the size of the charge current (see formula):
The PWM duty cycle for the different charge cycles are listed
below:
4.3.9 User Interface
The user interface consists of three LEDs and one buzzer.
The LEDs have four different states:
On, off, slow flash (~1 Hz) and fast flash (~10 Hz). The buzz-
er has three different states: off, one short beep (~100ms)
and one long beep (~1s).
The user interface is designed in a flexible way. Use of the
buzzer or the LEDs is optional, depending on design require-
ments. It is possible to use the LM3647 with one, two or all
three LEDs.
A single Charged Status LED can be implemented with a 2-
input NAND gate on LED1 and LED3. In this implemention,
note that a pull-up resistor is required on LED1 and LED3.
Ni-Cd/Ni-MH User Interface Scheme
C2
1uF
C1
1uF
C9
1uF
R5
10k
R6
10k
R22
10k
PWM
DC-PWM
CURRENT-LIMITER
I out =Vd = Voltage Drop Across D1
1.25 - Vd
R1
Charge Phase:
PWM Duty Cycle:
Soft Start
10%
Fast Charge
100%
Topping Charge
10%
Maintenance Charge
5%
Charge phase
LED1 status
LED2 status
LED3 status
Buzzer status
No battery
Off
Off
Off
Off
New battery / Temp-test
Fast flash
Off
Off
Short beep
Softstart charge
Slow flash
Off
Off
Off
Charging
On
Slow flash
Off
Off
Topping charge
On
Fast flash
Off
Off
Maintenance
On
Off
On
Long beep
Discharge
Off
Slow flash
Off
Off
Temperature error
2 Fast flashes
Off
On
Short beep
Error
Fast flash
Off
Fast flash
Short beep



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