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參數(shù)資料
| 型號(hào)： | LM3647IMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | PLASTIC, SOIC-20 |
| 文件頁(yè)數(shù)： | 2/14頁(yè) |
| 文件大?。?/td> | 271K |
| 代理商： | LM3647IMX |
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4.0 Functional Description (Continued)
4.3.7 BUZZER Output Circuitry
The buzzer-circuitry turns the transistor Q3 on when the
buzzer should sound. If the current consumption for the
buzzer is lower than 0.3 mA then the buzzer may be directly
connected to the BUZZER-pin. Please note that the
BUZZER-pin does not generate a PWM-signal, therefore the
buzzer must have its own oscillator circuitry. If an electro-
magnetic buzzer is used, then the transistor may need a
reverse-biased diode to protect it from harmful voltage
spikes.
10131820
4.3.8 User Interface
The user interface consists of up to three LEDs and one
buzzer. The LEDs have four different states:
On, off, slow flash (
1 Hz) and fast flash (10 Hz). The
buzzer has three different states: off, one short beep (
100
ms) 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 “end of charge” Status LED can be implemented
with a 2-input NAND gate on pins LED1 and LED3. In this
implementation, note that a pull-up resistor is required on
LED1 and LED3.
Ni-Cd/Ni-MH User Interface Scheme
Charge Phase
LED1 Status
LED2 Status
LED3 Status
Buzzer Status
No Battery
Off
New Battery/Temp-Test
Fast Flash
Off
Short Beep
Softstart Charge
Slow Flash
Off
Charging
On
Slow Flash
Off
Topping Charge
On
Fast Flash
Off
Maintenance
On
Off
On
Long Beep
Discharge
Off
Slow Flash
Off
Temperature Error
2 Fast Flashes
Off
On
Short Beep
Error
Fast Flash
Off
Fast Flash
Short Beep
Li-Ion User Interface Scheme
Charge Phase
LED1 Status
LED2 Status
LED3 Status
Buzzer Status
No Battery
Off
New Battery/Temp-Test
Fast Flash
Off
Short Beep
Qualification Charge
Slow Flash
Off
Charging CC
On
Slow Flash
Off
Charging CV
On
Fast Flash
Off
Maintenance
On
Off
On
Long Beep
Temperature Error
2 Fast Flashes
Off
On
Short Beep
Error
Fast Flash
Off
Fast Flash
Short Beep
4.3.9 Recommended Dimensioning for the Temperature
Sensor
The LM3647 is designed for use with a NTC resistor as a
temperature sensor. The NTC should have 3 k
@ 25C and
a
β = 3988. The voltage at TEMP-input must be between
2.2V and 0.5V for the charger to start. While charging, the
voltage must stay between 3.0V (maximum temperature) for
Li-Ion, or 3.15V (maximum temperature) for Ni-Cd/Ni-MH,
and 0.5V (minimum temperature) or the charger will register
a temperature fault and abort the charge. These voltages
correspond to the upper and lower limits for the battery pack
temperature.
When no NTC is used the TEMP-input pin must be con-
nected to a voltage level between 2.2V and 0.5V.
LM3647
www.national.com
10
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