ISL97642 Intersil Corporation, ISL97642 Datasheet - Page 11

• Manufacturer Part Number: ISL97642
• Description: TFT-LCD DC/DC
• Manufacturer: Intersil Corporation

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The current through MOSFET is limited to 2.8A (typ) peak.
This restricts the maximum output current based on
Equation 3:
I
OMAX
=
⎛
⎝
I
LMT
–
ΔI
--------
2
L
⎞
⎠
FBB
×
V
---------
V
IN
O
I
I
FB
REF
11
FIGURE 17. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER
COMPENSATION
AMPLIFIER
AMPLIFIER
CURRENT
GENERATOR
REFERENCE
GM
SLOPE
COMP
(EQ. 3)
ISL97642
CLOCK
Where ΔI L is peak to peak inductor ripple current, and is set
by Equation 4:
where f
ΔI
LOGIC
PWM
L
=
V
---------
S
L
IN
is the switching frequency.
×
---- -
f
D
S
AND START-UP
SHUTDOWN
BUFFER
CONTROL
I
REF
I
FB
PGND
LX
June 18, 2007
FN6436.0
(EQ. 4)