Datasheet

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FUNCTIONALBLOCKDIAGRAM
VBIAS
PH
BOOT
VIN
LSG
VBIAS
Error
Amplifier
2x Oscillator
PWM Ramp
(Feed Forward)
SYNC
RT
VSENSE
PWM
Comparator
Reference
System
SS/ENA
VBIAS2
Hiccup
Timer
Thermal
Shutdown
Current Limit
Hiccup
Hiccup
UVLO
UVLO
UVLO
1.2V
Bias + Drive
Regulator
PWRGD
AGND
PGND
Rising
Edge
Delay
VBIAS
COMP
TPS54550
Adaptive Deadtime
97% Ref
POWERPAD
VSENSE
UVLO
S
R
Q
320 kΩ
125 kΩ
5 µA
OC
and
Contol Logic
OC
TPS54550
SLVS623A–MARCH2006–REVISEDAPRIL2006
7
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