参数资料
| 型号： | ISL97651ARTZ-T |
| 厂商： | Intersil |
| 文件页数： | 13/19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
V IN
LX1, LX2
FBB
A VDD
potential for noise being coupled into the feedback pin. A
resistor network in the order of 1k Ω is recommended.
Buck Converter Input Capacitor
The capacitor should support the maximum AC RMS current
which happens when D = 0.5 and maximum output current.
INTERSIL
ISL97651
I ACRMS ( C IN ) =
D ? ( 1 – D ) ? I O
(EQ. 13)
Where I O is the output current of the buck converter. Table 6
shows some recommendations for input capacitor.
TABLE 6. INPUT CAPACITOR (BUCK) RECOMMENDATION
FIGURE 12. CASCADED MOSFET TOPOLOGY FOR HIGH
CAPACITOR
SIZE
VENDOR
PART NUMBER
OUTPUT VOLTAGE APPLICATIONS
10μF/16V
1206 TDK
C3216X7R1C106M
Buck Converter
10μF/10V
0805 Murata
GRM21BR61A106K
The buck converter is the step down converter, which
supplies the current to the logic circuit of the LCD system.
22μF/16V
1210
Murata
C3225X7R1C226M
The ISL97651 integrates an 20V N-Channel MOSFET to
save cost and reduce external component count. In the
continuous current mode, the relationship between input
voltage and output voltage is shown in Equation 9:
Buck Inductor
An inductor value in the range 3.3μH to 10μH is
recommended for the buck converter. Besides the
inductance, the DC resistance and the saturation current
V LOGIC
---------------------- = D
V IN
(EQ. 9)
should also be considered when choosing buck inductor.
Low DC resistance can help maintain high efficiency, and the
saturation current rating should be at least 2A. Table 7
Where D is the duty cycle of the switching MOSFET.
Because D is always less than 1, the output voltage of buck
converter is lower than input voltage.
shows some recommendations for buck inductor.
TABLE 7. BUCK INDUCTOR RECOMMENDATION
DIMENSIONS
The peak current limit of buck converter is set to 2A, which
INDUCTOR
(mm) VENDOR
PART NUMBER
restricts the maximum output current (average) based on the
Equation 10:
4.7μH/2.7A PEAK
6.8μH/3A PEAK
5.7x5.0x4.7
7.3x6.8x3.2
Murata
TDK
LQH55DN4R7M01K
RLF7030T-6R8M2R8
I OMAX = 2A – Δ I pp
(EQ. 10)
10μH/2.4A PEAK 12.95x9.4x3.0 Coilcraft
DO3308P-103
Where Δ I PP is the ripple current in the buck inductor as the
Equation 11:
Rectifier Diode (Buck Converter)
A Schottky diode is recommended due to fast recovery and
Δ I pp = ---------------------- ? ( 1 – D )
V LOGIC
L ? f s
(EQ. 11)
low forward voltage. The reverse voltage rating should be
higher than the maximum input voltage. The peak current
rating is 2A, and the average current should be as the
Where L is the buck inductor, f s is the switching frequency
(1.2MHz).
Feedback Resistors
The buck converter output voltage is determined by the
Equation 12:
Equation 14:
I AVG = ( 1 – D ) *I o
(EQ. 14)
Where I O is the output current of buck converter. Table 8
shows some diode recommended.
V LOGIC = --------------------------- × V REF
R 14 + R 15
R 15
(EQ. 12)
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
V R /I AVG
DIODE RATING PACKAGE VENDOR
Where R14 and R15 are the feedback resistors of buck
converter to set the output voltage current drawn by the
resistor network should be limited to maintain the overall
PMEG2020EJ
SS22
20V/2A
20V/2A
SOD323F
SMB
Philips Semiconductors
Fairchild Semiconductor
converter efficiency. The maximum value of the resistor
network is limited by the feedback input bias current and the
13
FN7493.3
April 24, 2009
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