Datasheet

TPS5538x
FB
11.5 kW
+
Error Amplifier
0.8 V
REF
BOOT
SW
+
Offset
f(I
DRAIN
)
PWM to
Switch
I
SLOPE
I
COMP
UDG-08040
COMP
R
COMP
C
COMP
I
COMP
– I
SLOPE
x2
VREF
VIN
VOUT
Compensation
Network
+
_
Modulator
Filter
Current
Feedback
Network
+
_
V
C
TPS55383 , , TPS55386
SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
Figure 22. Feedback Loop Equivalent Circuit
A more conventional small-signal equivalent block diagram is shown in Figure 23 . Here, the full closed-loop
signal path is shown. Because the TPS5538x contains internal slope compensation, the external L-C filter must
be selected appropriately so that the resulting control loop meets criteria for stability.
Figure 23. Small Signal Equivalent Block Diagram
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