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參數(shù)資料
| 型號(hào)： | LM5021NA-2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | AC-DC Current Mode PWM Controller |
| 中文描述： | 0.7 A SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 746K |
| 代理商： | LM5021NA-2 |
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Connection Diagram
Top View
20144202
MSOP-8 and MDIP-8
Ordering Information
Order Number
LM5021MM-1
LM5021MMX-1
LM5021NA-1
LM5021MM-2
LM5021MMX-2
LM5021NA-2
Description
80% Duty Cycle Limit
80% Duty Cycle Limit
80% Duty Cycle Limit
50% Duty Cycle Limit
50% Duty Cycle Limit
50% Duty Cycle Limit
Package Type
MSOP-8
MSOP-8
MDIP-8
MSOP-8
MSOP-8
MDIP-8
Supplied As
Available Soon
Available Soon
40 Units per Rail
Available Soon
Available Soon
40 Units per Rail
Pin Description
PIN
1
NAME
COMP
DESCRIPTION
Control input for the Pulse Width Modulator
and Hiccup comparators.
Input voltage.
APPLICATION INFORMATION
COMP pull-up is provided by an internal 5K resistor
which may be used to bias an opto-coupler transistor.
Input to start-up regulator. The VIN pin is clamped at
36V by an internal zener diode.
VCC provides bias to controller and gate drive sections
of the LM5021. An external capacitor must be connected
from this pin to ground.
High current output to the external MOSFET gate input
with source/sink current capability of 0.3A and 0.7A
respectively.
2
VIN
3
VCC
Output of a linear bias supply regulator.
Nominally 8.5V.
4
OUT
MOSFET gate driver output.
5
6
GND
CS
Ground return.
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.
An external resistor connected from RT to GND sets the
oscillator frequency. This pin will also accept
synchronization pulses from an external clock.
An external capacitor and an internal 22 μA current
source set the soft-start ramp. The soft -start capacitor
controls both the soft-start rate and the hiccup mode
period.
7
RT / SYNC
Oscillator timing resistor pin and
synchronization input.
8
SS
Soft-start / Hiccup time
L
www.national.com
2
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| LM5021MMX-1 | AC-DC Current Mode PWM Controller |
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