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| 型号： | ADP1614ACPZ-650-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 4A 10LFCSP |
| 标准包装： | 1,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 20 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 650kHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
t ON =
D
V IN × t ON
? I L = (5)
V IN × t ON
? I L
? V ? 1 . 245 ?
R1 = R2 × ? OUT ? (2)
L > L MIN =
ADP1614
APPLICATIONS INFORMATION
ADIsimPower DESIGN TOOL
The ADP1614 is supported by the ADIsimPower? design toolset.
ADIsimPower is a collection of tools that produce complete
power designs that are optimized for a specific design goal. The
tools enable the user to generate a full schematic and bill of
materials and to calculate performance in minutes. ADIsimPower
can optimize designs for cost, area, efficiency, and parts count
while taking into consideration the operating conditions and
limitations of the IC and the external components. For more
information about the ADIsimPower design tools, visit
www.analog.com/ADIsimPower . The toolset is available from
this website, and users can request an unpopulated board.
SETTING THE OUTPUT VOLTAGE
The ADP1614 features an adjustable output voltage range of V IN
to 20 V. The output voltage is set by the resistor voltage divider,
R1 and R2 (see Figure 32), from the output voltage (V OUT ) to the
1.245 V feedback input at FB. Use the following equation to
determine the output voltage:
V OUT = 1.245 × (1 + R1 / R2 ) (1)
Choose R1 based on the following equation:
? 1 . 245 ?
INDUCTOR SELECTION
The inductor is an essential part of the step-up switching
converter. It stores energy during the on time of the power
switch and transfers that energy to the output through the
output rectifier during the off time. To balance the trade-offs
between small inductor current ripple and efficiency, induc-
tance values in the range of 4.7 μH to 22 μH are recommended.
In general, lower inductance values have higher saturation
current and lower series resistance for a given physical size.
However, lower inductance values result in higher peak current,
which can lead to reduced efficiency and greater input and/or
output ripple and noise. A peak-to-peak inductor ripple current
close to 30% of the maximum dc input current typically yields
an optimal compromise.
For determining the inductor ripple current in continuous
operation, the input (V IN ) and output (V OUT ) voltages determine
the switch duty cycle (D) as follows:
Data Sheet
The duty cycle and switching frequency (f SW ) can be used to
determine the on time:
(4)
f SW
The inductor ripple current ( ? I L ) in steady state is calculated by
L
Solve for the inductance value (L) as follows:
L = (6)
Ensure that the peak inductor current (the maximum input
current plus half the inductor ripple current) is below the rated
saturation current of the inductor. Likewise, make sure that the
maximum rated rms current of the inductor is greater than the
maximum dc input current to the regulator.
For continuous current-mode (CCM) duty cycles greater than
50% that occur with input voltages less than one-half the output
voltage, slope compensation is required to maintain stability of
the current-mode regulator. For stable current-mode operation,
ensure that the selected inductance is equal to or greater than
the minimum calculated inductance, L MIN , for the application
parameters in the following equation:
( V OUT ? 2 × V IN ) (7)
8 × f SW
Inductors smaller than the 4.7 μH to 22 μH recommended
range can be used as long as Equation 7 is satisfied for the given
application. For input/output combinations that approach the
90% maximum duty cycle, doubling the inductor is recom-
mended to ensure stable operation. Table 5 suggests a series
Table 5. Suggested Inductors
Manufacturer Part Series
Coilcraft XAL40xx, XAL50xx, XAL6060, DO3316P
TOKO Inc. FDV06xx, DG6045C, FDSD0630, DEM8045C,
FDVE1040
Würth Elektronik WE-HCI, WE-TPC, WE-PD, WE-PD2, WE -PDF
Vishay Dale IHLP-2020, IHLP-2525, IHLP-3232, IHLP-4040
TDK Components SPM6530, VLP8040, VLF10040, VLF10045
D =
V OUT ? V IN
V OUT
(3)
Taiyo Yuden
NRS8030, NRS8040
Rev. A | Page 14 of 20
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