lm5021na-2 National Semiconductor Corporation, lm5021na-2 Datasheet - Page 3

• Manufacturer Part Number: lm5021na-2
• Description: Ac-dc Current Mode Pwm Controller
• Manufacturer: National Semiconductor Corporation

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