lm5021na-2 National Semiconductor Corporation, lm5021na-2 Datasheet - Page 4

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

www.national.com
Electrical Characteristics
apply over the full Operating Junction Temperature Range. Unless otherwise specified: V
3) (Continued)
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 1.5kΩ resistor into each pin.
Note 3: Min and Max limits are 100% production tested at 25˚C. 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.
PWM COMPARATOR
SLOPE COMPENSATION
OUTPUT SECTION
HICCUP MODE
THERMAL RESISTANCE
Symbol
V
I
I
V
V
OVCS
DTCS
OVLD
θ
θ
RST
HIC
JA
JA
COMP to OUT delay
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 Comp Amplitude
(LM5021-1 only)
OUT High Saturation
OUT Low Saturation
Peak Source Current
Peak Sink Current
Rise time
Fall time
Over load detection threshold
Hiccup mode threshold
Hiccup mode Restart threshold
Dead-time current source
Overload detection timer current
source
MSOP-8 Junction to Ambient
MDIP-8 Junction to Ambient
Parameter
Specifications in standard type face are for T
COMP set to 2V
CS stepped 0 to
0.4V, time to OUT
transition low, C
= 0.
COMP = 0V
COMP = 0V
CS pin to PWM
Comparator offset at
maximum duty cycle
IOUT = 50mA, VCC
- OUT
IOUT = 100mA
OUT = VCC/2.
OUT = VCC/2.
C
C
COMP pin
SS pin
SS pin
0 LFM
0 LFM
load
load
Conditions
= 1nF
= 1nF
4
load
V
V
SS-OCV
SS-OCV
Min
4.2
0.6
0.1
0.1
75
70
6
– 0.8 V
– 0.8 V
J
SS-OCV
SS-OCV
= +25˚C and those in boldface type
0.33
2.75
0.25
Typ
200
107
IN
5.1
1.1
0.6
0.3
0.3
0.7
0.3
20
80
50
90
25
10
10
= 15V, R
– 0.6 V
– 0.6 V
T
SS-OCV
SS-OCV
= 44.2KΩ. (Note
Max
110
1.5
1.1
0.5
0.4
85
14
0
6
1
– 0.4
– 0.4
˚C/W
˚C/W
Unit
mA
mV
µA
µA
ns
ns
ns
%
%
%
V
V
V
V
A
A
V
V
V