参数资料
| 型号： | ISL97651ARTZ-T |
| 厂商： | Intersil |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY HP 4CHN 36-TQFN |
| 标准包装： | 4,000 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 400µA |
| 电源电压： | 4 V ~ 5.5 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： | 带卷 (TR) |
ISL97651
Applications Information
The ISL97651 provides a complete power solution for TFT
This restricts the maximum output current (average) based
on Equation 3:
I OMAX = ? I LMT – -------- ? × ---------
V O
LCD applications. The system consists of one boost
converter to generate the A VDD voltage for column drivers,
one buck converter to provide voltage to logic circuit in the
? 2 ?
Δ I L V IN
(EQ. 3)
Δ I L = --------- × -----
f S
LCD panel, one integrated V ON charge pump and one V OFF
linear-regulator controller to provide the voltage to row
drivers. This part also integrates V ON -slice circuit which can
help to optimize the picture quality. With the high output
current capability, this part is ideal for big screen LCD TV
and monitor panel application.
The integrated boost converter and buck converter operate
at 1.2MHz which can allow the use of multilayer ceramic
capacitors and low profile inductor which result in low cost,
compact and reliable system. The logic output voltage is
independently enabled to give flexibility to the system
Where Δ I L is peak to peak inductor ripple current, and is set
by Equation 4:
V IN D
L
(EQ. 4)
where f S is the switching frequency (1.2MHz).
Table 1 gives typical values (margins are considered 10%,
3%, 20%, 10% and 15% on V IN , V O , L, f S and I OMAX :
TABLE 1. MAXIMUM OUTPUT CURRENT CALCULATION
designers.
Boost Converter
The boost converter is a current mode PWM converter
operating at a fixed frequency of 1.2MHz. It can operate in
both discontinuous conduction mode (DCM) at light load 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
V IN (V)
4
4
4
5
5
5
V O (V)
9
12
15
9
12
15
L (μH)
6.8
6.8
6.8
6.8
6.8
6.8
F S (MHz)
1.2
1.2
1.2
1.2
1.2
1.2
I OMAX (mA)
1661
1173
879
2077
1466
1099
conversion ratio in continuous current mode is given by
Equation 1:
Boost Converter Input Capacitor
V BOOST 1
V IN
------------------------ = -------------
1 – D
(EQ. 1)
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
Where D is the duty cycle of the switching MOSFET
Figure 11 shows the functional block diagram of the boost
regulator. It uses a summing amplifier architecture consisting
of gm stages for voltage feedback, current feedback and
slope compensation. A comparator looks at the peak
rating of input capacitor should be larger than the maximum
input voltage. Examples of recommended capacitors are
given in Table 2 below.
TABLE 2. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
inductor current cycle by cycle and terminates the PWM
cycle if the current limit is reached.
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
CAPACITOR
10μF/16V
10μF/10V
22μF/10V
SIZE
1206
0805
1210
VENDOR
TDK
Murata
Murata
PART NUMBER
C3216X7R1C106M
GRM21BR61A106K
GRB32ER61A226K
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 component 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 without
( R 3 + R 5 )
V BOOST = -------------------------- × V REF
I LAVG = -------------
R 5
(EQ. 2)
saturating the following average and peak current:
I O
1 – D
I LPK = I LAVG + --------
The current through the MOSFET is limited to a minimum of
4.4A PEAK (maximum values can be up to 6.3A PEAK .
11
Δ I L
2
(EQ. 5)
FN7493.3
April 24, 2009
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