參數(shù)資料
型號： LM5021NA-2
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 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
文件頁數(shù)： 3/15頁
文件大小： 746K
代理商： LM5021NA-2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
VIN Clamp Continuous Current
CS to GND
RT to GND
All other pins to GND
-0.3V to 30V
5mA
-0.3V to 1.25V
-0.3V to 5.5V
-0.3V to 7.0V
ESD Rating (Note 2)
Human Body Model
Storage Temperature
Operating Junction Temperature
2kV
-65C to +150C
+150C
Operating Ratings
(Note 1)
VIN Voltage (Note 5)
Junction Temperature
8V to 30V
-40C to +125C
Electrical Characteristics
type
apply over the full
Operating Junction Temperature Range
. Unless otherwise specified: V
IN
= 15V, R
T
= 44.2K
.
(Note 3)
Specifications in standard type face are for T
J
= +25C and those in
boldface
Symbol
STARTUP CIRCUIT
Parameter
Conditions
Min
Typ
Max
Unit
Start Up Current
VCC Regulator enable threshold
VCC Regulator disable
threshold
VIN ESD Clamp voltage
Operating supply current
VCC SUPPLY
Controller enable threshold
Controller disable threshold
VCC regulated output
VCC dropout voltage (VIN -
VCC)
VCC regulator current limit
Before VCC Enable
18
20
7.25
25
23
μA
V
V
17
I = 5mA
COMP = 0VDC
30
36
2.5
40
3.75
V
I
VIN
mA
6.5
5.3
8
7
7.5
6.3
9
V
V
V
V
5.8
8.5
1.7
No External Load
I = 5 mA
VCC = 7.5V (Note
4)
15
22
mA
SKIP CYCLE MODE COMPARATOR
Skip Cycle mode enable
threshold
Skip Cycle mode hysteresis
CURRENT LIMIT
CS limit to OUT delay
1
3
[COMP - 1.25V]
75
125
175
mV
5
mV
CS stepped from 0
to 0.6V, time to OUT
transition low, C
load
= 0.
35
ns
CS limit threshold
Leading Edge Blanking time
CS blanking sinking impedance
SOFT-START
V
SS-OCV
SS pin open-circuit voltage
Soft-start Current Source
Soft-start to COMP Offset
COMP sinking impedance
OSCILLATOR
Frequency1 (RT = 44.2K)
Frequency2 (RT = 13.3K)
Sync threshold
0.45
0.5
90
35
0.55
V
ns
55
4.3
15
0.35
5.2
22
0.55
60
6.1
30
0.75
V
μA
V
During SS ramp
135
440
2.4
150
500
3.2
165
560
3.8
kHz
kHz
V
L
www.national.com
3
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