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參數(shù)資料
| 型號(hào)： | ISL97653AIRZ-TK |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | 5-Channel Integrated LCD Supply |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PQCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, QFN-40 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 523K |
| 代理商： | ISL97653AIRZ-TK |
13
FN6367.0
December 6, 2007
and source of M0. In addition, a resistor can be connected
between PROT and the gate of M0, in order to limit the
maximum V
GS
of M0 at all times.
Buck Converter
The buck converter is a step down converter supplying
power to the logic circuit of the LCD system. The ISL97653A
integrates a high voltage N-channel MOSFET to save cost
and reduce external component count. In the continuous
current mode, the relationship between input voltage and
output voltage as expressed in Equation 8:
Where D is the duty cycle of the switching MOSFET.
Because D is always less than 1, the output voltage of a
buck converter is lower than input voltage.
The peak current limit of buck converter is set to 2.5A, which
restricts the maximum output current (average) based on
Equation 9:
Where
Δ
I
P-P
is the ripple current in the buck inductor as
shown in Equation 10:
Where L is the buck inductor, f
s
is the switching frequency
(680kHz).
Feedback Resistors
The buck converter output voltage is determined by
Equation 11:
Where R
13
and R
14
are the feedback resistors in the buck
converter loop 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
Ω
is recommended.
Buck Converter Input Capacitor
Input capacitance should support the maximum AC RMS
current which occurs at D = 0.5 and maximum output
current.
Where I
o
is the output current of the buck converter. Table 6
shows some recommendations for input capacitor.
Buck Inductor
A 3.3μH to 10μH inductor range is recommended for the
buck converter. Besides the inductance, the DC resistance
and the saturation current are also factors that need to be
considered when choosing a buck inductor. Low DC
resistance can help maintain high efficiency. Saturation
current rating should be higher than 2A. Here are some
recommendations for buck inductor.
Rectifier Diode (Buck Converter)
A Schottky diode is recommended for fast recovery and low
forward voltage. The reverse voltage rating should be higher
than the maximum input voltage. The peak current rating is
2.5A, and the average current is given by Equation 13:
Where I
o
is the output current of buck converter. The
following table shows some diode recommended.
V
IN
---------------------
D
=
(EQ. 8)
I
OMAX
2.5A
Δ
I
P-P
–
=
(EQ. 9)
Δ
I
pp
V
s
---------------------
1
D
–
(
)
=
(EQ. 10)
V
LOGIC
R
--------------------------
R
+
14
V
FBL
×
=
(EQ. 11)
I
acrms
C
IN
(
)
D
1
D
–
(
)
I
O
=
(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/
2.7A
PEAK
5.7x5.0x4.7
Murata
LQH55DN4R7M01K
6.8μH/
3A
PEAK
7.3x6.8x3.2
TDK
RLF7030T-6R8M2R8
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
I
avg
1
D
–
(
)
*I
o
=
(EQ. 13)
ISL97653A
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| ISL97653IRZ | 制造商:Intersil Corporation 功能描述: |
| ISL97656IRTZ | 功能描述:IC REG BOOST ADJ 4A 10TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ISL97656IRTZEVALZ | 功能描述:EVAL BOARD FOR ISL97656IRTZ RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL97656IRTZ-T | 功能描述:IC REG BOOST ADJ 4A 10TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ISL97656IRTZ-TK | 功能描述:IC REG BOOST ADJ 4A 10TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:EZBuck™ 類型:降壓（降壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:0.8 V ~ 22.1 V 輸入電壓:3 V ~ 26 V PWM 型:電流模式 頻率 - 開關(guān):1.5MHz 電流 - 輸出:1.8A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:8-DFN（2x2） 其它名稱:785-1276-1 |
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