Datasheet

2 MHz
Oscillator
Soft
Start
Ramp
Generator
Thermal
Shutdown
Undervoltage
Lockout
Frequency
Compensation
+
-
Error
Amp
Control Logic Driver
Current Limit
Comparator
Ref1
PFM Current
Comparator
Ref2
SW
Zero Crossing
Comparator
FB
EN
V
IN
PWM Comparator
pfm_low
pfm_hi
GND
Bandgap
+
-
Vcomp
1.0V
Fixed Ver
Adj Ver
+
-
0.5V
+
-
+
-
+
-
V
REF
LM3671
LM3671Q
SNVS294Q –NOVEMBER 2004–REVISED NOVEMBER 2013 www.ti.com
BLOCK DIAGRAM
Figure 6. Simplified Functional Diagram
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