参数资料
| 型号： | ISL97646IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST LDO VON VCOM 24-QFN |
| 标准包装： | 6,000 |
| 应用： | 转换器，LCD 显示器 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 2 |
| 输出电压： | 8 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
ISL97646
Operation
The boost converter is a current mode PWM converter
operating at either a 650kHz or 1.2MHz. It can operate in
The current through the MOSFET is limited to 2.6A PEAK .
This restricts the maximum output current (average) based
on the Equation 3:
I OMAX = ? I LMT – -------- ? × ---------
V O
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
? 2 ?
Δ I L V IN
(EQ. 3)
conversion ratio in continuous current mode is given by:
Where Δ I L is peak to peak inductor ripple current, and is set
V BOOST 1
V IN
Δ I L = --------- × ----
f s
------------------------ = -------------
1 – D
(EQ. 1)
by:
V IN D
L
(EQ. 4)
Where D is the duty cycle of the switching MOSFET.
Figure 13 shows the 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 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
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.
where f S is the switching frequency (650kHz or 1.2MHz).
Table 2 gives typical values (margins are considered 10%,
3%, 20%, 10% and 15% on V IN , V O , L, f S and I OMAX ).
Capacitor
An input capacitor is used to suppress the voltage ripple
injected into the boost converter. The 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 1
for input capacitor.
TABLE 1. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
The boost converter output voltage is determined by
Equation 2:
CAPACITOR
10μF/16V
SIZE
1206
MFG
TDK
PART NUMBER
C3216X7R1C106M
V BOOST = --------------------- × V FB
R 1 + R 2
R 2
(EQ. 2)
10μF/10V
22μF/10V
0805
1210
Murata
Murata
GRM21BR61A106K
GRB32ER61A226K
TABLE 2. MAXIMUM OUTPUT CURRENT CALCULATION
V IN (V)
3
3
3
5
5
5
5
3
3
3
5
5
5
5
V O (V)
9
12
15
9
12
15
18
9
12
15
9
12
15
18
L (μH)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
f s (MHz)
0.65
0.65
0.65
0.65
0.65
0.65
0.65
1.2
1.2
1.2
1.2
1.2
1.2
1.2
I OMAX (mA)
636
419
289
1060
699
482
338
742
525
395
1236
875
658
514
10
FN6265.1
December 14, 2007
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| ISL97646IRZ-TK | 功能描述:直流/直流开关调节器 ISL97646IRZOOST +L DO +VON SLICE +VCOM 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 |
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| ISL97648IRTZ-T | 制造商:Intersil Corporation 功能描述:HIGH VOLTAGE TFT-LCD LOGIC DRIVER (56 LD TQFN 8X8) - Tape and Reel |
| ISL97648IRTZ-TK | 制造商:Intersil Corporation 功能描述:HIGH VOLTAGE TFT-LCD LOGIC DRIVER (56 LD TQFN 8X8) - Tape and Reel |
| ISL97649AIRZ | 功能描述:PMIC 解决方案 LCD SUPPLY DCP VCOM AMP BPMSET +LDO 28L RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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