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參數資料
| 型號： | LM20145 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| 中文描述： | 第5A，頻率可調的PowerWise㈢同步降壓穩(wěn)壓器 |
| 文件頁數： | 2/22頁 |
| 文件大小： | 601K |
| 代理商： | LM20145 |
Connection Diagram
30030702
Top View
eTSSOP-16 Package
Ordering Information
Order Number
LM20145MH
LM20145MHE
LM20145MHX
Package Type
eTSSOP-16
NSC Package Drawing
MXA16A
Package Marking
20145MH
Supplied As
92 Units of Rail
250 Units of Tape and Reel
2500 Units of Tape and Reel
Pin Descriptions
Pin #
1
Name
SS/TRK
Description
Soft-Start or Tracking control input. An internal 5 μA current source charges an external capacitor to
set the Soft-Start ramp rate. If driven by a external source less than 800 mV, this pin overrides the
internal reference that sets the output voltage. If left open, an internal 1ms Soft-Start ramp is activated.
Feedback input to the error amplifier from the regulated output. This pin is connected to the inverting
input of the internal transconductance error amplifier. An 800 mV reference connected to the non-
inverting input of the error amplifier sets the closed loop regulation voltage at the FB pin.
Power good output signal. Open drain output indicating the output voltage is regulating within
tolerance. A pull-up resistor of 10 k
to 100 k
is recommend for most applications.
External compensation pin. Connect a resistor and capacitor to this pin to compensate the device.
These pins must be connected to GND to ensure proper operation
Input voltage to the power switches inside the device. These pins should be connected together at the
device. A low ESR capacitor should be placed near these pins to stabilize the input voltage.
Switch pin. The PWM output of the internal power switches.
Power ground pin for the internal power switches.
Precision enable input for the device. An external voltage divider can be used to set the device turn-
on threshold. If not used the EN pin should be connected to PVIN.
Internal 2.7V sub-regulator. This pin should be bypassed with a 1 μF ceramic capacitor.
Analog input supply that generates the internal bias. Must be connected to VIN through a low pass
RC filter.
Quiet analog ground for the internal bias circuitry.
Frequency adjust pin. Connecting a resistor on this pin to ground will set the oscillator frequency.
Exposed metal pad on the underside of the package with a weak electrical connection to ground. It is
recommended to connect this pad to the PC board ground plane in order to improve heat dissipation.
2
FB
3
PGOOD
4
5
COMP
NC
PVIN
6,7
8,9
10,11
12
SW
PGND
EN
13
14
VCC
AVIN
15
16
EP
AGND
RT
Exposed Pad
www.national.com
2
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM20145_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| LM20145CS-A | 制造商:CEC Industries 功能描述:LED, RPL, BULB, AMBER, T-6, E12, Lamp Base Type:Candelabra Screw, LED Color:Ambe |
| LM20145CS-B | 制造商:CEC Industries 功能描述:LED, RPL, BULB, BLUE, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Blue; Wavelength Typ:470nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No |
| LM20145CS-G | 制造商:CEC Industries 功能描述:LED, RPL, BULB, GREEN, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Green; Wavelength Typ:525nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No |
| LM20145CS-R | 制造商:CEC Industries 功能描述:LED, RPL, BULB, RED, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Red; Wavelength Typ:629nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No |
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