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參數(shù)資料
| 型號(hào)： | LM2639MX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 8700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | PLASTIC, SOIC-24 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 198K |
| 代理商： | LM2639MX/NOPB |
Pin Description
Pin
Pin Name
Pin Function
1
Vcc5V
Supply Voltage Input (5V nominal)
2
Divsel
Selects Phase Mode. Logic low selects 4 phase. Logic high selects 3 phase. 2 phase
operation is achieved by using 2 outputs in 4 phase mode.
3
Clksel
Clock Select: Logic high selects internal clock. Logic low selects external clock.
4
Extclk
External Clock Input. Output frequency = Clock Input / No. of Phases. Connect to Vcc5V to
select internal clock.
5
Rref
Connects to external reference resistor. Sets the operating frequency of the internal clock
and the ramp time for the PWM. Reference voltage at this pin is 1.26V.
6
Vid0
5-Bit DAC Input (LSB).
7
Vid1
5-Bit DAC Input.
8
Vid2
5-Bit DAC Input.
9
Vid3
5-Bit DAC Input.
10
Vid4
5-Bit DAC Input (MSB)
11
OC+
Over-current Comparator. Non-inverting input.
12
OC
Over-current Comparator. Inverting input.
13
COMP
Compensation Pin. This is the output of the internal transconductance amplifier.
Compensation network should be connected between this pin and feedback ground FBG.
14
FB
Feedback Input. Normally Kelvin connected to supply output.
15
Bgout
Current Limit Flag. Goes to logic low when current limit is activated. When over-current
condition is removed, this pin is weakly pulled up to Vcc5V.
16
FBG
Feedback Ground. This pin should be connected to the ground at the supply output.
17
ENABLE
Output Enable Pin. Tie to logic high to enable and logic low to disable.
18
GND
Power Ground Pin.
19
DRV2
Phase 2 Output.
20
DRV0
Phase 0 Output.
21
Vcc12V
Supply Voltage for FET Drivers DRV0:3.
22
DRV1
Phase 1 Output.
23
DRV3
Phase 3 Output.
24
OutV
Sets the maximum DRV0:3 drive voltage to reduce switching loss in external FET’s.
LM2639
www.national.com
5
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