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SP7652 Datasheet(PDF) 6 Page - Sipex Corporation

Part # SP7652
Description  Wide Input Voltage Range 6A, 600kHz, Buck Regulator
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7652 Datasheet(HTML) 6 Page - Sipex Corporation

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Rev F: /0/06
SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator
© Copyright 2006 Sipex Corporation
THEORY OF OPERATION
over frequencies greater than 50kHz.
The common mode output of the error am-
plifier is 0.9V to 2.2V. Therefore, the PWM
voltageramphasbeensetbetween.Vand
2.2Vto ensure proper0% to 100% dutycycle
capability. The voltage loop also includes
two other very important features. One is an
asynchronous startup mode. Basically, the
synchronous rectifier cannot turn on unless
the high-side NFET has attempted to turn
on or the SS pin has exceeded .7V. This
featurepreventsthecontrollerfrom“dragging
down” the output voltage during startup or in
fault modes. The second feature is a 100%
dutycycletimeoutthatensuressynchronized
refreshing of the BST capacitor at very high
duty ratios. In the event that the high-side
NFET is on for 20 continuous clock cycles,
a reset is given to the PWM flip-flop half
way through the 2st cycle. This forces GL
to rise for the cycle, in turn refreshing the
BST capacitor.
Power MOSFETs
TheSP7652containsapairofintegratedlow
resistanceN-MOSFETsdesignedtodriveup
to 6Aof output current. Maximum output cur-
rent could be limited by thermal limitations of
aparticularapplication.TheSP7652incorpo-
rates a built-in over-temperature protection
to prevent internal overheating.
GH
voltage
GL
voltage
v(v in)
0v
-0v
-v(Diode) v
v(v in)+v(v CC )
BsT
voltage
v(v CC )
TiMe
sWn
voltage
vBsT
vsWn
v(v CC)
The SP7652 can be set to different output
voltages. The relationship in the following
formula is based on a voltage divider from
the output to the feedback pin VFB, which is
set to an internal reference voltage of 0.80V.
Standard 1% metal film resistors of surface
mount size 0603 are recommended.
VOut = 0.80V (R1/R2+1)
=> R2=
Where R1 = 68.1kΩ and for VOut = 0.80V
setting, simply remove R2 from the board.
Furthermore, one could select the value
of the R and R2 combination to meet the
exact output voltage setting by restricting
R1 resistance range such that 50kΩ < R1
< 100kΩ for overall system loop stability.
Setting Output Voltages
R
{(VOut / 0.8V) -1}


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