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| 型號(hào)： | ISL97650ARTZ-TK |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動(dòng)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(yè)數(shù)： | 12/20頁(yè) |
| 文件大?。?/td> | 333K |
| 代理商： | ISL97650ARTZ-TK |
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12
FN9198.3
November 28, 2006
Boost Inductor
The boost inductor is a critical part which influences the
output voltage ripple, transient response, and efficiency.
Values of 3.3μH to 10μH are to match the internal slope
compensation. 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. The
following table 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. C
OUT
in the equation above assumes the
effective value of the capacitor at a particular voltage and not
the manufacturer's stated value, measured at zero volts.
The following table 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 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.
R16 = short) may help to reduce A
VDD
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/
3A
PEAK
7.3x6.8x3.2
TDK
RLF7030T-6R8N3R0
6.8μH/
2.9A
PEAK
7.6X7.6X3.0
Sumida
CDR7D28MNNP-6R8NC
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
SL23
30V/2A
SMB
Vishay Semiconductor
I
LAVG
I
–
1
D
-------------
=
(EQ. 5)
I
LPK
I
LAVG
Δ
I
L
2
--------
+
=
(EQ. 6)
V
RIPPLE
I
LPK
ESR
V
-----------------------
V
–
O
I
OUT
---------------
1
f
s
---
×
×
+
×
=
(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
–
=
(EQ. 8)
C18
)
-------------------------------------------------------
=
(EQ. 9)
ISL97650
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL97652 | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97652IRZ | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97652IRZ-T | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| 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(kāi)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(kāi)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(kāi)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(kāi)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(dòng)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(dòng)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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