Datasheet

CS
SS
VIN
GND
VCC
8.5V LINEAR
REGULATOR
OSC
OUT
SLOPE COMPENSATION RAMP GENERATOR
DRIVER
PWM
COMPARATOR
5.2V
CLK
22 PA
10 PA
0.25 PA
COMP
SKIP CYCLE
COMPARATOR
MAX DUTY LIMIT
LM5021 - 1 (80%)
LM5021 - 2 (50%)
(LM5021 - 1 ONLY)
+
-
+
-
1.8k
5k
2R
R
125 mV
CURRENT LIMIT
COMPARATOR
36V
CLAMP
RT/ SYNC
50 PA
0 PA
VIN UVLO
20V RISING
7.25V FALLING
EN
VCC_UVLO
QS
R
+
-
PWM
LOGIC
+
-
SS
5.2V
1.25V
550 mV
VCC_UVLO
VCC_UVLO
DIS
SOFTSTART
AND
HICCUP
MODE
LOGIC
COMP
VCC_UVLO
VCC UVLO
7V RISING
5.8V FALLING
1
500 mV
CLK
Leading Edge Blanking
7
2
3
4
8
5
6
LM5021
www.ti.com SNVS359D –MAY 2005–REVISED MARCH 2013
Simplified Block Diagram
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