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參數資料
| 型號： | LM5020SD-1 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 100V Current Mode PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 4 X 4 MM, LLP-8 |
| 文件頁數： | 3/12頁 |
| 文件大?。?/td> | 229K |
| 代理商： | LM5020SD-1 |
Pin Description
PIN
1
NAME
Vin
DESCRIPTION
Source Input Voltage
APPLICATION INFORMATION
Input to start-up regulator. Input range
13V to 100V.
Inverting input of the internal error
amplifier. The non-inverting input is
internally connected to a 1.25V
reference.
COMP pull-up is provided by an
internal 5K resistor which may be
used to bias an opto-coupler
transistor.
If an auxiliary winding raises the
voltage on this pin above the
regulation set point, the internal series
pass regulator will shutdown, reducing
the controller power dissipation.
Gate driver output with a 1A peak
current capability
2
FB
Feedback Signal
3
COMP
The output of the error
amplifier and input to the
Pulse Width Modulator
4
V
CC
Output of the internal high
voltage series pass regulator.
Regulated output voltage 7.7V
5
OUT
Output of the PWM controller
6
7
GND
UVLO
Ground return
Line Under-Voltage Shutdown An external resistor divider from the
power converter source sets the
shutdown levels. The threshold of
operation equals 1.25V. Hysteresis is
set by a switched internal 20μA
current source.
Current Sense input
Current sense input for current mode
control and over-current protection.
Current limiting is accomplished using
a dedicated current sense comparator.
If the CS comparator input exceeds
0.5V the OUT pin switches low for
cycle-by-cycle current limiting. CS is
held low for 50ns after OUT switches
high to blank leading edge current
spikes.
Oscillator timing resistor pin
and synchronization input
RT to GND sets the oscillator
frequency. This pin will also accept
synchronization pulses from an
external clock.
Softstart Input
An external capacitor and an internal
10μA current source set the soft-start
ramp rate.
8
CS
9
RT / SYNC
An external resistor connected from
10
SS
L
www.national.com
3
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| LM5020SDX-2 | 100V Current Mode PWM Controller |
| LM5021MM-1 | AC-DC Current Mode PWM Controller |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM5020SD-1/NOPB | 功能描述:電流型 PWM 控制器 100V Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| LM5020SD-2 | 制造商:Texas Instruments 功能描述:Current Mode PWM Controller -0.3V to 7V 1A 10-Pin LLP EP T/R |
| LM5020SD-2/NOPB | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| LM5020SDX-1 | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| LM5020SDX-1/NOPB | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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