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TPS51513RHBT Datasheet(PDF) 12 Page - Texas Instruments

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Part No. TPS51513RHBT
Description  SINGLE PHASE, D-CAP SYNCHRONOUS BUCK CONTROLLER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS51513RHBT Datasheet(HTML) 12 Page - Texas Instruments

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T – Time
Current
Feedback
T
ON
T
V
CMP
V
DROOP
f
OUT
ON
IN
SEL
V
1
t
30 ns
V
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=
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+
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÷
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ø è
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TPS51513
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
www.ti.com
PWM Operation
Referring to Figure 1 and Figure 4, in steady state, continuous conduction mode, the converter operates as
follows:
Starting with the condition that the top FET is off and the bottom FET is on, the current feedback (VCMP) is higher
than the error amplifier output (VDROOP). VCMP falls until it hits VDROOP, which contains a component of the output
ripple voltage. The PWM comparator senses where the two waveforms cross and triggers the on-time generator.
Figure 4. D-CAP+ Mode Basic Waveforms
The current feedback is an amplified and filtered version of the voltage between the CSP and CSN inputs. The
TPS51513 provides fully differential current and voltage feedback to increase the system accuracy and reduce
the dependence of circuit performance on layout.
PWM Frequency and Adaptive On-Time Control
The on-time is determined by Equation 1.
where
fSEL is the frequency selected by the connection of the TONSEL pin, given in Table 3
(1)
The on-time pulse is sent to the top FET; the inductor current and the current feedback rises to its maximum
value. Each ON pulse is latched to prevent double pulsing.
12
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Copyright © 2009–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51513


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