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參數(shù)資料
| 型號： | ISL97651ARTZ-TK |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 4-Channel Integrated LCD Supply |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, QCC36 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220WJJD-1, TQFN-36 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 307K |
| 代理商： | ISL97651ARTZ-TK |
12
FN7493.2
March 15, 2007
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 shows 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. C
OUT
in Equation 6 assumes the effective value
of the capacitor at a particular voltage and not the
manufacturer’s stated value, measured at 0V.
Table 5 shows some selections of output capacitors.
PI Loop Compensation (Boost Converter)
The boost converter of ISL97651 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 A
VDD
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 A
VDD
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
C
OUT
= 10μF and fp = 4kHz for C
OUT
= 30μF. Alternatively,
adding a small capacitor (20-100pF) in parallel with R5 (i.e.
R17 = short) may help to reduce A
VDD
noise and improve
regulation, particularly if high value feedback resistors are
used.
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 12. The voltage rating of the external
MOSFET should be greater than A
VDD
.
TABLE 3. BOOST INDUCTOR RECOMMENDATION
INDUCTOR
DIMENSIONS
(mm)
VENDOR
PART NUMBER
6.8μH/
4.6A
PEAK
12.95x9.4x5.21 Coilcraft
DO3316P-682ML
10μH/
5.5A
PEAK
10x10x5
Sumida
CDR10D48MNNP-100NC
5.2μH/
4.55A
PEAK
10x10.1x3.8
Cooper
Bussmann
CD1-5R2
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
DIODE
V
R
/I
AVG
RATING
PACKAGE
VENDOR
SS23
30V/2A
SMB
Fairchild
Semiconductor
MBRS340
40V/3A
SMC
International
Rectifier
SL23
30V/2A
SMB
Vishay
Semiconductor
V
RIPPLE
I
LPK
ESR
V
-----------------------
V
–
O
I
OUT
---------------
1
f
s
---
×
×
+
×
=
(EQ. 6)
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10μF/25V
1210
TDK
C3225X7R1E106M
10μF/25V
1210
Murata
GRM32DR61E106K
R17
------------------------
---------
–
1
–
=
(EQ. 7)
C18
)
-------------------------------------------------------
=
(EQ. 8)
ISL97651
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