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| 型号： | ISL97646IRZ-EVALZ |
| 厂商： | Intersil |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ISL97646 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步升 |
| 输出及类型： | 2，非隔离 |
| 电流 - 输出： | 350mA |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 650kHz，1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL97646 |
ISL97646
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 used to match the internal
slope compensation. The inductor must be able to handle
NOTE: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across then increases.
C OUT in Equation 6 above assumes the effective value of the
capacitor at a particular voltage and not the manufacturer ’s stated
value, measured at zero volts.
Table 5 lists some selections of output capacitors.
I LAVG = -------------
the following average and peak current:
I O
1 – D
(EQ. 5)
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR SIZE MFG PART NUMBER
I LPK = I LAVG + --------
Δ I L
2
10μF/25V
10μF/25V
1210
1210
TDK
Murata
C3225X7R1E106M
GRM32DR61E106K
Some inductors are recommended in Table 3.
TABLE 3. BOOST INDUCTOR RECOMMENDATION
Compensation
INDUCTOR
6.8μH/3A PEAK
10μH/4A PEAK
DIMENSIONS
(mm)
7.3x6.8x3.2
8.3x8.3x4.5
MFG
TDK
Sumida
PART NUMBER
RLF7030T-6R8N3R0
CDR8D43-100NC
The boost converter of ISL97646 can be compensated by a
RC network connected from the CM1 pin to ground. 4.7nF
and 10k RC network is used in the demo board. The larger
value resistor and lower value capacitor can lower the
transient overshoot, however, at the expense of stability of
5.2μH/4.55A PEAK 10x10.1x3.8
Cooper
CD1-5R2
the loop.
Bussmann
Rectifier Diode
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
Cascaded MOSFET Application
A 20V N-Channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
greater than 20V, an external cascaded MOSFET is needed,
as shown in Figure 15. The voltage rating of the external
MOSFET should be greater than A VDD .
voltage. The rectifier diode must meet the output current and
peak inductor current requirements. Table 4 lists some
recommendations for boost converter diode.
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
V IN
LX
A VDD
DIODE
SS23
MBRS340
V R /I AVG RATING
30V/2A
40V/3A
PACKAGE
SMB
SMC
MFG
Fairchild
Semiconductor
International
INTERSIL
ISL97646
FB
Rectifier
SL23
30V/2A
SMB
Vishay
Semiconductor
V RIPPLE = I LPK × ESR + ------------------------ × ---------------- × ----
C
f
V
Output Capacitor
The output capacitor supplies the load directly and reduces
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.
V O – V IN I O 1
(EQ. 6)
O OUT s
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.
11
FIGURE 15. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
Linear-Regulator (LDO)
The ISL97646 includes a LDO with adjustable output, and it
can supply current up to 350mA. The output voltage is
adjusted by connection of ADJ pin. When ADJ pin is
connected to ground, the output voltage is set to 3.3V; when
ADJ pin is floating, the output voltage is set to 2.85V, and
when ADJ pin is connected to LDO_OUT pin, the output
voltage is set to 2.5V.
FN6265.1
December 14, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97646IRZ-T | 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 |
| 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 |
| ISL97648IRTZ | 功能描述:IC BOOST DC/DC REG RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| 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 |
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