ISL97642 データシートの表示（PDF） - Intersil
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ISL97642 Datasheet PDF : 19 Pages
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ISL97642
The current through MOSFET is limited to 2.8A (typ) peak.
This restricts the maximum output current based on
Equation 3:
IOMAX
=
⎝⎛ILMT – -Δ--2--I--L-⎠⎞
× V-----I--N--
VO
(EQ. 3)
Where ΔIL is peak to peak inductor ripple current, and is set
by Equation 4:
ΔIL
=
-V----I--N--
L
×
-D---
fS
(EQ. 4)
where fS is the switching frequency.
SLOPE
COMPENSATION
CLOCK
SHUTDOWN
AND START-UP
CONTROL
IFB
IREF
CURRENT
AMPLIFIER
FBB
GM
AMPLIFIER
REFERENCE
GENERATOR
PWM
LX
LOGIC
BUFFER
IFB
IREF
COMP
PGND
FIGURE 17. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER
11
FN6436.0
June 18, 2007
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