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參數(shù)資料
| 型號： | LM5021 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | AC-DC Current Mode PWM Controller |
| 中文描述： | 交直流電流模式PWM控制器 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 746K |
| 代理商： | LM5021 |
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, R
T
= 44.2K
. (Note
3) (Continued)
Symbol
PWM COMPARATOR
Parameter
Conditions
Min
Typ
Max
Unit
COMP to OUT delay
COMP set to 2V
CS stepped 0 to
0.4V, time to OUT
transition low, C
load
= 0.
COMP = 0V
20
ns
Min Duty Cycle
Max Duty Cycle (-1 Device)
Max Duty Cycle (-2 Device)
COMP to PWM comparator gain
COMP Open Circuit Voltage
COMP at Max Duty Cycle
COMP Short Circuit Current
SLOPE COMPENSATION
Slope Comp Amplitude
(LM5021-1 only)
0
85
%
%
%
75
80
50
0.33
5.1
2.75
1.1
4.2
6
V
V
COMP = 0V
0.6
1.5
mA
CS pin to PWM
Comparator offset at
maximum duty cycle
70
90
110
mV
OUTPUT SECTION
OUT High Saturation
IOUT = 50mA, VCC
- OUT
IOUT = 100mA
OUT = VCC/2.
OUT = VCC/2.
C
load
= 1nF
C
load
= 1nF
0.6
1.1
V
OUT Low Saturation
Peak Source Current
Peak Sink Current
Rise time
Fall time
0.3
0.3
0.7
25
10
1
V
A
A
ns
ns
HICCUP MODE
V
OVLD
V
HIC
V
RST
I
DTCS
I
OVCS
Over load detection threshold
Hiccup mode threshold
Hiccup mode Restart threshold
Dead-time current source
Overload detection timer current
source
THERMAL RESISTANCE
θ
JA
MSOP-8 Junction to Ambient
θ
JA
MDIP-8 Junction to Ambient
COMP pin
SS pin
SS pin
V
SS-OCV
– 0.8
V
SS-OCV
– 0.8
0.1
0.1
6
V
SS-OCV
– 0.6
V
SS-OCV
– 0.4
V
SS-OCV
– 0.6
V
SS-OCV
– 0.4
0.3
0.25
10
V
V
V
μA
μA
0.5
0.4
14
0 LFM
0 LFM
200
107
C/W
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.
L
www.national.com
4
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