参数资料
| 型号： | ISL97653AIRZ |
| 厂商： | Intersil |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY 5CHN 40-QFN |
| 标准包装： | 50 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 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： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN 裸露焊盘（6x6） |
| 包装： | 管件 |
ISL97653A
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 lists two recommendations for boost
converter diode.
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
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.
Cascaded MOSFET Application
A 20V N-Channel MOSFET is integrated in the boost
regulator. For applications requiring output voltages greater
than 20V, an external cascaded MOSFET is needed as
DIODE
FYD0504SA
30WQ04FN
V R /I AVG
RATING
50V/2A
40V/3.5A
PACKAGE
DPAK
DPAK
VENDOR
Fairchild
Semiconductor
International
shown in Figure 15. The voltage rating of the external
MOSFET should be greater than A VDD .
V IN
A VDD
Rectifier
Output Capacitor
LX1, LX2
Integrating output capacitors supply the load directly and
reduce 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.
INTERSIL
ISL97653A
FBB
V RIPPLE = I LPK × ESR + ------------------------ × ---------------- × ----
V C f
V O – V IN I O 1
O OUT s
(EQ. 7)
FIGURE 15. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
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 them
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.
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR SIZE VENDOR PART NUMBER
V IN Protection
A series external P-FET can be used to prevent passive
power-up inrush current from the Boost output capacitors
charging to V IN - V SCHOTTKY via the boost inductor and
Schottky diode. This FET also adds protection in the event of
a short circuit on A VDD. The gate of the PFET (shown as M0
in the “Typical Application Diagram” on page 5) is controlled
by PROT. When EN is low, PROT is pulled internally to
PVIN1, thus M0 is switched off. When EN goes high, PROT
is pulled down slowly via a 50μA current source, switching
M0 on.
If the device is powered up with EN tied to high, M0 will
remain switched off until the voltage on VL exceeds the
10μF/25V
10μF/25V
1210
1210
TDK
Murata
C3225X7R1E106M
GRM32DR61E106K
VLOR threshold. Once the voltage on PROT falls below 0.6V
and the step-up regulator is within 90% of its target voltage,
PROT is pulled down to ground via a 1.3k Ω impedance. If
PI Loop Compensation (Boost Converter)
The boost converter of ISL97653A can be compensated by
a RC network connected from COMP pin to ground.
C 2 = 4.7nF and R 2 = 0 Ω to 10 Ω . A RC network is used in the
demo board. A higher capacitor value can be used to
increase system stability.
12
A VDD falls 10% below regulation, the drive to PROT reverts
to a 50μA current source. If a timed fault is detected, M0 is
actively switched off.
Several additional external components can optionally be
used to fine-tune the function of pin PROT (shown in the
dashed box near M0 in the application diagram). PROT
ramp rate can be controlled by adding a capacitor C30
between gate and source of M0. M0 gate voltage can be
FN6367.3
September 7, 2010
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| ISL97653AIRZ-T | 功能描述:电流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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| ISL97653IRZ | 制造商:Intersil Corporation 功能描述: |
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