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參數資料
| 型號： | LM5021NA-2/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.7 A SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數： | 8/15頁 |
| 文件大?。?/td> | 747K |
| 代理商： | LM5021NA-2/NOPB |
Connection Diagram
Top View
20144202
MSOP-8 and MDIP-8
Ordering Information
Order Number
Description
Package Type
Supplied As
LM5021MM-1
80% Duty Cycle Limit
MSOP-8
1000 Units on Tape and Reel
LM5021MMX-1
80% Duty Cycle Limit
MSOP-8
3500 Units on Tape and Reel
LM5021NA-1
80% Duty Cycle Limit
MDIP-8
40 Units per Rail
LM5021MM-2
50% Duty Cycle Limit
MSOP-8
1000 Units on Tape and Reel
LM5021MMX-2
50% Duty Cycle Limit
MSOP-8
3500 Units on Tape and Reel
LM5021NA-2
50% Duty Cycle Limit
MDIP-8
40 Units per Rail
Pin Description
PIN
NAME
DESCRIPTION
APPLICATION INFORMATION
1
COMP
Control input for the Pulse Width Modulator
and Hiccup comparators.
COMP pull-up is provided by an internal 5K resistor
which may be used to bias an opto-coupler transistor.
2
VIN
Input voltage.
Input to start-up regulator. The VIN pin is clamped at
36V by an internal zener diode.
3
VCC
Output of a linear bias supply regulator.
Nominally 8.5V.
VCC provides bias to controller and gate drive sections
of the LM5021. An external capacitor must be connected
from this pin to ground.
4
OUT
MOSFET gate driver output.
High current output to the external MOSFET gate input
with source/sink current capability of 0.3A and 0.7A
respectively.
5
GND
Ground return.
6
CS
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 0.5 Volts the OUT pin
switches low for cycle-by-cycle current limit. CS is held
low for 90ns after OUT switches high to blank the
leading edge current spike.
7
RT / SYNC
Oscillator timing resistor pin and
synchronization input.
An external resistor connected from RT to GND sets the
oscillator frequency. This pin will also accept
synchronization pulses from an external clock.
8
SS
Soft-start / Hiccup time
An external capacitor and an internal 22 A current
source set the soft-start ramp. The soft -start capacitor
controls both the soft-start rate and the hiccup mode
period.
LM5021
www.national.com
2
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