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ISL97650 Datasheet(PDF) 12 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]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL97650 Datasheet(HTML) 12 Page - Renesas Technology Corp

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ISL97650
FN9198 Rev.4.00
Page 12 of 20
April 17, 2009
The inductor must be able to handle the following average and
peak current:
Some inductors are recommended in Table 3.
Rectifier Diode (Boost Converter)
A high-speed diode is necessary due to the high switching
frequency. Schottky diodes are recommended because of their
fast recovery time and low forward voltage. The reverse
voltage rating of this diode should be higher than the maximum
output voltage. The rectifier diode must meet the output current
and peak inductor current requirements.
Table 4 is some recommendations for boost converter diode.
Output Capacitor
The output capacitor supplies the load directly and reduces the
ripple voltage at the output. Output ripple voltage consists of
two components: the voltage drop due to the inductor ripple
current flowing through the ESR of output capacitor, and the
charging and discharging of the output capacitor.
For low ESR ceramic capacitors, the output ripple is dominated
by the charging and discharging of the output capacitor. The
voltage rating of the output capacitor should be greater than
the maximum output voltage.
Note: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across then
increases. COUT in Equation 7 assumes the effective value of
the capacitor at a particular voltage and not the manufacturer's
stated value, measured at zero volts.
Table 5 shows some selections of output capacitors.
PI Loop Compensation (Boost Converter)
The boost converter of ISL97650 can be compensated by a
RC network connected from CM1 pin to ground. C3 = 4.7nF
and R1 = 10k RC network is used in the demo board. A higher
resistor value can be used to lower the transient overshoot -
however, this may be at the expense of stability to the loop.
The stability can be examined by repeatedly changing the load
between 100mA and a max level that is likely to be used in the
system being used. The AVDD voltage should be examined
with an oscilloscope set to AC 100mV/div and the amount of
ringing observed when the load current changes. Reduce
excessive ringing by reducing the value of the resistor in series
with the CM1 pin capacitor.
Boost Converter Feedback Resistors and Capacitor
An RC network across feedback resistor R5 may be required
to optimize boost stability when AVDD voltage is set to less
than 12V. This network reduces the internal voltage feedback
used by the IC. This RC network sets a pole in the control loop.
This pole is set to approximately fp = 10kHz for COUT = 10µF
and fp = 4kHz for COUT = 30µF. Alternatively, adding a small
capacitor (20 to 100pF) in parallel with R5 (i.e. R16 = short)
may help to reduce AVDD noise and improve regulation,
particularly if high value feedback resistors are used.
TABLE 3. BOOST INDUCTOR RECOMMENDATION
INDUCTOR
DIMENSIONS
(mm)
VENDOR
PART NUMBER
6.8µH/
3APEAK
7.3x6.8x3.2 TDK
RLF7030T-6R8N3R0
6.8µH/
2.9APEAK
7.6x7.6x3.0 Sumida
CDR7D28MNNP-6R8NC
5.2µH/
4.55APEAK
10x10.1x3.8 Cooper
Bussmann
CD1-5R2
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
DIODE
VR/IAVG
RATING
PACKAGE
VENDOR
SS23
30V/2A
SMB
Fairchild Semiconductor
SL23
30V/2A
SMB
Vishay Semiconductor
ILAVG
IO
1D
-------------
=
(EQ. 5)
ILPK
ILAVG
I
L
2
--------
+
=
(EQ. 6)
VRIPPLE
ILPK ESR
VO VIN
VO
------------------------
IO
COUT
----------------
1
fs
----
+
=
(EQ. 7)
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10µF/25V
1210
TDK
C3225X7R1E106M
10µF/25V
1210
Murata
GRM32DR61E106K
R16
1
0.1 R5
--------------------------


1
R3
--------


1
=
(EQ. 8)
C18
1
2 3.142 fp R5

-------------------------------------------------------
=
(EQ. 9)


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