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| 型号： | ISL97650ARTZ-TK |
| 厂商： | Intersil |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY HP 4CHAN 36-TQFN |
| 标准包装： | 1 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 250µA |
| 电源电压： | 4 V ~ 14 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1249 (CN2011-ZH PDF) |
| 其它名称： | ISL97650ARTZ-TKDKR |
ISL97650
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:
Note: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across then
increases. C OUT in Equation 7 assumes the effective value
of the capacitor at a particular voltage and not the
manufacturer's stated value, measured at zero volts.
Table 5 shows some selections of output capacitors.
I LAVG = -------------
I O
1 – D
(EQ. 5)
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR SIZE VENDOR PART NUMBER
I LPK = I LAVG + --------
Δ I L
2
(EQ. 6)
10μF/25V
10μF/25V
1210
1210
TDK
Murata
C3225X7R1E106M
GRM32DR61E106K
Some inductors are recommended in Table 3.
TABLE 3. BOOST INDUCTOR RECOMMENDATION
DIMENSIONS
PI Loop Compensation (Boost Converter)
The boost converter of ISL97650 can be compensated by a
INDUCTOR
(mm) VENDOR
PART NUMBER
RC network connected from CM1 pin to ground. C3 = 4.7nF
6.8μH/
3A PEAK
6.8μH/
2.9A PEAK
7.3x6.8x3.2
7.6x7.6x3.0
TDK
Sumida
RLF7030T-6R8N3R0
CDR7D28MNNP-6R8NC
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.
5.2μH/
4.55A PEAK
10x10.1x3.8 Cooper
Bussmann
CD1-5R2
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
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 is some recommendations for boost converter diode.
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
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
DIODE
SS23
SL23
V R /I AVG
RATING
30V/2A
30V/2A
PACKAGE
SMB
SMB
VENDOR
Fairchild Semiconductor
Vishay Semiconductor
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 to 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.
R16 = ? ? -------------------------- ? – -------- ?
Output Capacitor
The output capacitor supplies the load directly and reduces
1 1
? ? 0.1 × R5 ? R3 ?
– 1
(EQ. 8)
the ripple voltage at the output. Output ripple voltage
C18 = -------------------------------------------------------
V RIPPLE = I LPK × ESR + ------------------------ × ---------------- × ----
V C f
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.
V O – V IN I O 1
(EQ. 7)
O OUT s
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.
12
1
( 2 × 3.142 × fp × R5 )
(EQ. 9)
FN9198.4
April 17, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97650BIRTZ-T | 功能描述:直流/直流开关调节器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97650BIRTZ-TK | 功能描述:直流/直流开关调节器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97651ARTZ | 制造商:Intersil Corporation 功能描述: |
| ISL97651ARTZ-T | 功能描述:显示驱动器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| ISL97651ARTZ-TK | 功能描述:显示驱动器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY 1K RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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