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參數(shù)資料
| 型號： | ISL97653AIRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅動器 |
| 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)： | 11/18頁 |
| 文件大?。?/td> | 523K |
| 代理商： | ISL97653AIRZ |
11
FN6367.0
December 6, 2007
Application Information
A
VDD
Boost Converter
The
A
VDD
boost converter features a fully integrated 4.4A
boost FET. The regulator uses a current mode PI control
scheme which provides good line regulation and good
transient response. It can operate in both discontinuous
conduction mode (DCM) at light loads and continuous mode
(CCM). In continuous current mode, current flows
continuously in the inductor during the entire switching cycle
in steady state operation. The voltage conversion ratio in
continuous current mode is given by Equation 1:
where D is the duty cycle of the switching MOSFET.
The boost soft-start function is digitally controlled within a
fixed 10ms time frame during which the current limit is
increased in eight linear steps.
The boost converter uses a summing amplifier architecture
for voltage feedback, current feedback, and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is triggered. Since this comparison is cycle
based, the PWM output will be released after the peak
current goes below the current limit threshold.
An external resistor divider is required to divide the output
voltage down to the nominal reference 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 60k
Ω
is recommended.
The boost converter output voltage is determined by
Equation 2:
where R
3
and R
4
are in the “” on page 5. Unless otherwise
stated, component variables referred to in equations refer to
the Typical Application Diagram.
The current through the MOSFET is limited to 4.4A peak.
This restricts the maximum output current (average) based
on Equation 3:
Where
Δ
IL is peak to peak inductor ripple current, and is set
by Equation 4. f
s
is the switching frequency (680kHz).
Table 1 gives typical values (worst case margins are
considered 10%, 3%, 20%, 10% and 15% on V
IN
, V
O
, L,
F
SW
and I
OMAX
):
Boost Converter Input Capacitor
An input capacitor is used to suppress the voltage ripple
injected into the boost converter. A ceramic capacitor with
capacitance larger than 10μF is recommended. The voltage
rating of input capacitor should be larger than the maximum
input voltage. Some capacitors are recommended in Table 2
for input capacitor.
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 recommended to match the
internal slope compensation as well as to maintain a good
transient response performance. The inductor must be able
to handle the average and peak currents expressed in
Equations 5 and 6:
Some inductors are recommended in Table 3.
V
IN
------------------
–
1
D
-------------
=
(EQ. 1)
A
VDD
R
--------------------
R
4
+
4
V
FBB
×
=
(EQ. 2)
I
OMAX
I
LMT
Δ
I
L
2
--------
–
V
O
---------
×
=
(EQ. 3)
Δ
I
L
V
---------
D
f
S
----
×
=
(EQ. 4)
TABLE 1. MAXIMUM OUTPUT CURRENT CALCULATION
V
IN
(V)
V
O
(V)
L
(μH)
I
OMAX
(mA)
5
9
6.8
2215
5
12
6.8
1673
5
15
6.8
1344
12
15
6.8
3254
12
18
6.8
2670
TABLE 2. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10μF/25V
1210
TDK
C3225X7R1E106M
10μF/25V
1210
Murata
GRM32DR61E106K
TABLE 3. BOOST INDUCTOR RECOMMENDATION
INDUCTOR
DIMENSIONS
(mm)
VENDOR
PART NUMBER
10μH/
5.1A
PEAK
13x13x4.5
TDK
RLF12545T-100M5R1
5.9μH/
6A
PEAK
12.9X12.9X4 Sumida
CDEP12D38NP-5R9MB-120
I
LAVG
I
–
1
D
-------------
=
(EQ. 5)
I
LPK
I
LAVG
Δ
I
L
2
--------
+
=
(EQ. 6)
ISL97653A
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97653AIRZ-T | 功能描述:電流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL97653AIRZ-TK | 功能描述:電流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| 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 開關穩(wěn)壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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: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) 供應商設備封裝:16-QSOP |
| ISL97656IRTZEVALZ | 功能描述:EVAL BOARD FOR ISL97656IRTZ RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產品培訓模塊:Obsolescence Mitigation Program 標準包裝: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)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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