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参数资料
| 型号： | LM3431SD |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, QCC28 |
| 封装： | LLP-28 |
| 文件页数： | 18/24页 |
| 文件大小： | 549K |
| 代理商： | LM3431SD |
Pin Descriptions
Pin #
(TSSOP, LLP)
Pin Name
Description
1, 26
VIN
Power supply input
2, 27
PGND
Power ground pin. Connect to ground.
3, 28
VCC
Internal reference voltage output. Bypass to PGND with a minimum 4.7 F capacitor.
4, 1
LG
Boost controller gate drive output. Connect to the NFET gate.
5, 2
CS
Boost controller current sense pin. Connect to the top side of the boost current sense resistor.
6, 3
ILIM
Boost controller current limit adjust pin. Connect a resistor from this pin to the Boost current sense
resistor to set the current limit threshold.
7, 4
MODE/F
Dimming mode selection pin. Pull high for digital PWM control. Or connect to a capacitor to GND to set
the internal dimming frequency.
8, 5
FF
Feedforward pin. Connect to a resistor to ground to control the output voltage over/undershoot during
PWM dimming
9, 6
RT
Frequency adjust pin. Connect a resistor from this pin to ground to set the operating frequency of the
boost controller.
10, 7
REF
Reference voltage. Use this pin to provide the REFIN voltage.
11, 8
REFIN
This pin sets the LED current feedback voltage. Connect to a resistor divider from the REF pin.
12, 9
COMP
Output of the error amplifier. Connect to the compensation network.
13, 10
SGND
Signal ground pin. Connect to ground.
14, 11
AFB
Anode feedback pin. The boost controller voltage feedback during LED off time. Connect this pin to a
resistor divider from the output voltage.
15, 12
SS/SH
Soft-start and sample-hold pin. Connect a capacitor from this pin to ground to set the soft-start time.
16, 13
DLY
Fault delay pin. Connect a capacitor from this pin to ground to set the delay time for shutdown.
17, 14
CFB
Cathode feedback pin. The boost controller voltage feedback. Connect through a diode to the bottom
cathode of each LED string.
18, 15
SC
LED short circuit detection pin. Connect through a diode to the bottom cathode of each string.
19, 16
LEDOFF
A dual function pin. The LEDOFF signal controls external drivers during PWM dimming. Or connect to
ground to enable automatic fault restart.
20, 17
SNS3
Current feedback for channel 3. Connect to the top of the channel 3 current sense resistor.
21, 18
NDRV3
Base drive for the channel 3 current regulator. Connect to the NPN base or NFET gate.
22, 19
SNS2
Current feedback for channel 2
23, 20
NDRV2
Base drive for the channel 2 current regulator
24, 21
SNS1
Current feedback for channel 1
25, 22
NDRV1
Base drive for the channel 1 current regulator
26, 23
THM
LED thermal monitor input pin. When pulled below 1.2V, device enters standby mode.
27, 24
DIM
PWM dimming input pin. Accepts a digital PWM or analog voltage level input to control LED current
duty cycle.
28, 25
EN
Enable pin. Connect to VIN through a resistor divider to set an external UVLO threshold. Pull low to
shutdown.
EP
Exposed pad. Connect to SGND
3
www.national.com
LM3431
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