SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011
FUNCTIONAL BLOCK DIAGRAM
V
I
Current Limit Comparator
Undervoltage
Lockout
Bias Supply
SYNC
+
–
REF
Soft Start
V
I
V
(COMP)
850 kHz
Oscillator
+
–
I
(AVG)
Comparator
REF
Comparator
+
Saw Tooth
Generator
–
Comparator High
Comparator Low
Comparator High2
+
SKIP Comparator
Error Amp
Comparator High
+
Compensation
Comparator Low
Comparator Low2
EN
–
V
REF
= 0.5 V
+
_
–
S
R
Control
Logic
Driver
Shoot-Through
Logic
P-Channel
Power MOSFET
SW
N-Channel
Power MOSFET
Load Comparator
PG
LBO
R1
R2
See Note
–
+
1.21 V
FB
LBI
PGND
GND
NOTE: For the adjustable versions (TPS62050, TPS62051), the internal feedback driver is disabled and the FB pin is
directly connected to the GM amplifier.
6
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