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参数资料
| 型号： | LM5021NA-2/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | LEAD FREE, PLASTIC, DIP-8 |
| 文件页数： | 10/15页 |
| 文件大小： | 747K |
| 代理商： | LM5021NA-2/NOPB |
Electrical Characteristics Specifications in standard type face are for T
J= +25C and those in boldface type
apply over the full Operating Junction Temperature Range. Unless otherwise specified: V
IN = 15V, RT = 44.2K
. (Note
3) (Continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
PWM COMPARATOR
COMP to OUT delay
COMP set to 2V
CS stepped 0 to
0.4V, time to OUT
transition low, C
load
=0.
20
ns
Min Duty Cycle
COMP = 0V
0
%
Max Duty Cycle (-1 Device)
75
80
85
%
Max Duty Cycle (-2 Device)
50
%
COMP to PWM comparator gain
0.33
COMP Open Circuit Voltage
4.2
5.1
6
V
COMP at Max Duty Cycle
2.75
V
COMP Short Circuit Current
COMP = 0V
0.6
1.1
1.5
mA
SLOPE COMPENSATION
Slope Comp Amplitude
(LM5021-1 only)
CS pin to PWM
Comparator offset at
maximum duty cycle
70
90
110
mV
OUTPUT SECTION
OUT High Saturation
IOUT = 50mA, VCC
- OUT
0.6
1.1
V
OUT Low Saturation
IOUT = 100mA
0.3
1
V
Peak Source Current
OUT = VCC/2.
0.3
A
Peak Sink Current
OUT = VCC/2.
0.7
A
Rise time
C
load = 1nF
25
ns
Fall time
C
load = 1nF
10
ns
HICCUP MODE
V
OVLD
Over load detection threshold
COMP pin
V
SS-OCV – 0.8
V
SS-OCV – 0.6
V
SS-OCV– 0.4
V
HIC
Hiccup mode threshold
SS pin
V
SS-OCV – 0.8
V
SS-OCV – 0.6
V
SS-OCV– 0.4
V
RST
Hiccup mode Restart threshold
SS pin
0.1
0.3
0.5
V
I
DTCS
Dead-time current source
0.1
0.25
0.4
A
I
OVCS
Overload detection timer current
source
6
10
14
A
THERMAL RESISTANCE
θ
JA
MSOP-8 Junction to Ambient
0 LFM
200
C/W
θ
JA
MDIP-8 Junction to Ambient
0 LFM
107
C/W
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k
resistor into each pin.
Note 3: Min and Max limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 4: Device thermal limitations may limit usable range.
Note 5: After initial turn-on at VIN = 20V.
LM5021
www.national.com
4
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