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參數(shù)資料
| 型號： | ISL97650ARTZ-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, PQCC36 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220WJJD-1, TMLFP-36 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 333K |
| 代理商： | ISL97650ARTZ-TK |
14
FN9198.3
November 28, 2006
Rectifier Diode (Buck Converter)
A Schottky diode is recommended due to fast recovery and
low forward voltage. The reverse voltage rating should be
higher than the maximum input voltage. The peak current
rating is 2A, and the average current should be as the
following equation:
Where I
o
is the output current of buck converter. The
following table shows some diode recommended.
Output Capacitor (Buck Converter)
Four 10μF or two 22μF ceramic capacitors are recommended
for this part. The overshoot and undershoot will be reduced
with more capacitance, but the recovery time will be longer.
PI Loop Compensation (Buck Converter)
The buck converter of ISL97650 can be compensated by a
RC network connected from CM2 pin to ground. C9 = 4.7nF
and R2 = 2k RC network is used in the demo board. The
larger value resistor can lower the transient overshoot,
however, at the expense of stability of the loop.
The stability can be optimized in a similar manner to that
described in the section on "PI Loop Compensation (Boost
Converter)”.
Bootstrap Capacitor (C16)
This capacitor is used to provide the supply to the high driver
circuitry for the buck MOSFET. The bootstrap supply is
formed by an internal diode and capacitor combination. A
1μF is recommended for ISL97650. A low value capacitor
can lead to overcharging and in turn damage the part.
If the load is too light, the on-time of the low side diode may
be insufficient to replenish the bootstrap capacitor voltage. In
this case, if V
IN
-V
BUCK
< 1.5V, the internal MOSFET pull-up
device may be unable to turn-on until V
LOGIC
falls. Hence,
there is a minimum load requirement in this case. The
minimum load can be adjusted by the feedback resistors
to FBL.
The bootstrap capacitor can only be charged when the
higher side MOSFET is off. If the load is too light which can
not make the on time of the low side diode be sufficient to
replenish the boot strap capacitor, the MOSFET can’t turn
on. Hence there is minimum load requirement to charge the
bootstrap capacitor properly.
Charge Pump Controllers (V
ON
and V
OFF
)
The ISL97650 includes 2 independent charge pumps (see
charge pump block and connection diagram). The negative
charge pump inverters the V
SUP
voltage and provides a
regulated negative output voltage. The positive charge pump
doubles or triples the V
SUP
voltage and provided a regulated
positive output voltage. The regulation of both the negative
and positive charge pumps is generated by internal
comparator that senses the output voltage and compares it
with the internal reference.
The pumps use pulse width modulation to adjust the pump
period, depending on the load present. The pumps can
provide 30mA for V
OFF
and 20mA for V
ON
.
Positive Charge Pump Design Consideration
The positive charge pump integrates all the diodes (D1, D2
and D3 shown in the “Block Diagram” on page 9) required
for x2 (V
SUP
doubler) and x3 (V
SUP
Tripler) modes of
operation. During the chip start-up sequence the mode of
operation is automatically detected when the charge pump is
enabled. With both C7 and C8 present, the x3 mode of
operation is detected. With C7 present, C8 open and with
C1+ shorted to C2+, the x2 mode of operation will be
detected.
Due to the internal switches to V
SUP
(M1, M2 and M3),
P
OUT
is independent of the voltage on V
SUP
until the charge
pump is enabled. This is important for TFT applications
where the negative charge pump output voltage (V
OFF
) and
A
VDD
supplies need to be established before P
OUT
.
The maximum P
OUT
charge pump current can be estimated
from the following equations assuming a 50% switching
duty:
Note: V
DIODE
(2 I
MAX
) is the on-chip diode voltage as a
function of I
MAX
and V
DIODE
(40mA) < 0.7V.
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
DIODE
V
R
/I
AVG
RATING
PACKAGE
VENDOR
PMEG2020EJ
20V/2A
SOD323F
Philips
Semiconductors
SS22
20V/2A
SMB
Fairchild
Semiconductor
TABLE 9. BUCK OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10μF/6.3V
0805
TDK
C2012X5R0J106M
10μF/6.3V
0805
Murata
GRM21BR60J106K
22μF/6.3V
1210
TDK
C3216X5R0J226M
100μF/6.3V
1206
Murata
GRM31CR60J107M
I
avg
1
D
–
(
)
*I
o
=
(EQ. 15)
I
MAX
2x
2
V
-------------------------------------------------------------------+
(
)
min of 50mA or
2
–
V
2
ONH
I
ONL
(
)
V V
)
–
0.95A
～
I
MAX
3x
3
V
-------------------------------------------------------------+
(
)
min of 50mA or
3
–
V
2
ONH
I
(
)
V V
ON
)
)
–
)
2
ONL
0.95V
～
(EQ. 16)
ISL97650
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| ISL97652IRZ-TK | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97653A | 5-Channel Integrated LCD Supply |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97650BIRTZ-T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ISL97650BIRTZ-TK | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ISL97651ARTZ | 制造商:Intersil Corporation 功能描述: |
| ISL97651ARTZ-T | 功能描述:顯示驅(qū)動器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| ISL97651ARTZ-TK | 功能描述:顯示驅(qū)動器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY 1K RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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