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ISL97650 Datasheet(PDF) 13 Page - Renesas Technology Corp

No. de pieza ISL97650
Descripción Electrónicos  4-Channel Integrated LCD Supply
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
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ISL97650 Datasheet(HTML) 13 Page - Renesas Technology Corp

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ISL97650
FN9198 Rev.4.00
Page 13 of 20
April 17, 2009
Cascaded MOSFET Application
An 20V N-channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
greater than 20V, an external cascaded MOSFET is needed as
shown in Figure 15. The voltage rating of the external
MOSFET should be greater than AVDD.
Buck Converter
The buck converter is the step down converter, which supplies
the current to the logic circuit of the LCD system. The
ISL97650 integrates an 20V N-channel MOSFET to save cost
and reduce external component count. In the continuous
current mode, the relationship between input voltage and
output voltage is as shown in Equation 10:
Where D is the duty cycle of the switching MOSFET. Because
D is always less than 1, the output voltage of buck converter is
lower than input voltage.
The peak current limit of buck converter is set to 2A, which
restricts the maximum output current (average) based on
Equation 11:
Where
Ipp is the ripple current in the buck inductor as
Equation 12,
Where L is the buck inductor, fs is the switching frequency
(1.2MHz).
Feedback Resistors
The buck converter output voltage is determined by the
Equation 13:
Where R14 and R15 are the feedback resistors of buck
converter to set the output voltage. Current drawn by the
resistor network should be limited to maintain the overall
converter efficiency. The maximum value of the resistor
network is limited by the feedback input bias current and the
potential for noise being coupled into the feedback pin. A
resistor network in the order of 1k
 is recommended.
Buck Converter Input Capacitor
The capacitor should support the maximum AC RMS current
which happens when D = 0.5 and maximum output current.
Where Io is the output current of the buck converter. Table 6
shows some recommendations for input capacitors.
Buck Inductor
An 3.3µH to 10µH inductor is the good choice for the buck
converter. Besides the inductance, the DC resistance and the
saturation current are also the factor needed to be considered
when choosing buck inductor. Low DC resistance can help
maintain high efficiency, and the saturation current rating
should be 2A. Here are some recommendations for buck
inductor.
FIGURE 15. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
INTERSIL
ISL97650
LX1, LX2
FBB
AVDD
VIN
VLOGIC
VIN
----------------------
D
=
(EQ. 10)
IOMAX
2A
I
pp
=
(EQ. 11)
I
pp
VLOGIC
Lfs
----------------------
1D

=
(EQ. 12)
TABLE 6. INPUT CAPACITOR (BUCK) RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10µF/16V
1206
TDK
C3216X7R1C106M
10µF/10V
0805
Murata
GRM21BR61A106K
22µF/16V
1210
Murata
C3225X7R1C226M
TABLE 7. BUCK INDUCTOR RECOMMENDATION
INDUCTOR
DIMENSIONS
(mm)
VENDOR
PART NUMBER
4.7µH/
2.7APEAK
5.7x5.0x4.7
Murata
LQH55DN4R7M01K
6.8µH/
3APEAK
7.3x6.8x3.2
TDK
RLF7030T-6R8M2R8
10µH/
2.4APEAK
12.95x9.4x3.0 Coilcraft
DO3308P-103
VLOGIC
R14 R15
+
R15
--------------------------- VFBL
=
(EQ. 13)
Iacrms CIN

D1 D

IO
=
(EQ. 14)


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