参数资料
| 型号： | ISL97653AIRZ |
| 厂商： | Intersil |
| 文件页数： | 11/18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
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
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 ):
TABLE 1. MAXIMUM OUTPUT CURRENT CALCULATION
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:
V IN
(V)
5
5
5
12
V O
(V)
9
12
15
15
L
(μH)
6.8
6.8
6.8
6.8
I OMAX
(mA)
2215
1673
1344
3254
V boost 1
1 – D
V IN
------------------ = -------------
where D is the duty cycle of the switching MOSFET.
(EQ. 1)
12 18 6.8 2670
Boost Converter Input Capacitor
An input capacitor is used to suppress the voltage ripple
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
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.
TABLE 2. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
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
CAPACITOR
10μF/25V
10μF/25V
SIZE
1210
1210
VENDOR
TDK
Murata
PART NUMBER
C3225X7R1E106M
GRM32DR61E106K
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:
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
A VDD = --------------------- × V FBB
R 3 + R 4
R 4
(EQ. 2)
Equations 5 and 6:
I O
1 – D
I LAVG = -------------
(EQ. 5)
referred to in equations refer to the Typical Application
2
Δ I L
I LPK = I LAVG + --------
(EQ. 6)
Diagram.
The current through the MOSFET is limited to 4.4A peak.
This restricts the maximum output current (average) based
on Equation 3:
Some inductors are recommended in Table 3.
TABLE 3. BOOST INDUCTOR RECOMMENDATION
DIMENSIONS
INDUCTOR (mm) VENDOR PART NUMBER
I OMAX = ? I LMT – -------- ? × ---------
V O
Δ I L V IN
? 2 ?
(EQ. 3)
10μH/
5.1A PEAK
13x13x4.5
TDK
RLF12545T-100M5R1
Where Δ IL is peak to peak inductor ripple current, and is set
by Equation 4. f s is the switching frequency (680kHz).
5.9μH/
6A PEAK
12.9X12.9X4 Sumida
CDEP12D38NP-5R9MB-120
Δ I L = --------- × -----
f S
V IN D
L
11
(EQ. 4)
FN6367.3
September 7, 2010
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