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参数资料
| 型号： | ADP1822ARQZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 720kHz |
| 电源电压： | 3.7 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 配用： | ADP1822-EVAL-ND - BOARD EVALUATION FOR ADP1822 |
| 其它名称： | ADP1822ARQZ-R7DKR |
I IN_RMS ? I LOAD ×
V OUT V IN
f ESRZ =
1
2 π ( C OUT ) ( ESR )
ADP1822
APPLICATION INFORMATION
SELECTING THE INPUT CAPACITOR
The input capacitor absorbs the switched input current of the
dc-to-dc converter, allowing the input source to deliver smooth
dc current. Choose an input capacitor whose impedance at the
switching frequency is lower than the input source impedance.
Use low equivalent series resistance (ESR) capacitors, such as
low ESR tantalum, ceramic, or organic electrolyte (such as
Sanyo OS-CON) types. For all types of capacitors, make sure
that the current rating of the capacitor is greater than the input
rms ripple current, which is approximately
× ? 1 (1)
V IN V OUT
OUTPUT LC FILTER
The output LC filter smoothes the switched voltage at SW,
making the output an almost dc voltage. Choose the output LC
filter to achieve the desired output ripple voltage. Since the
output LC filter is part of the regulator negative-feedback
control loop, the choice of the output LC filter components
affects the regulation control-loop stability.
Choose an inductor value such that the inductor ripple current
is approximately 1/3 of the maximum dc output load current.
Using a larger value inductor results in a physical size larger
than required, and using a smaller value results in increased
losses in the inductor and/or MOSFET switches.
Data Sheet
The output ripple voltage is a function of the inductor ripple
current and the capacitor impedance at the switching frequency.
For high ESR capacitors, the impedance is dominated by the ESR,
while for low ESR capacitors, the impedance is dominated by
the capacitance. Determine if the capacitor is high ESR or low
ESR by comparing the zero frequency formed by the capacitance
and the ESR to the switching frequency:
(3)
where:
f ESRZ is the frequency of the output capacitor ESR zero.
C OUT is the output capacitance.
ESR is the equivalent series resistance of the capacitor.
If f ESRZ is much less than the switching frequency, then the capacitor
is high ESR, and the ESR dominates the impedance at the switching
frequency. If f ESRZ is much greater than the switching frequency, the
capacitor is low ESR, and the impedance is dominated by the
capacitance at the switching frequency.
When using capacitors whose impedance is dominated by ESR
at the switching frequency (such as tantalum or aluminum
electrolytic capacitors), approximate the output voltage ripple
current by
Δ V OUT ? Δ I L ( ESR ) (4)
where:
L =
V OUT ? 1 ? OUT ?
Choose the inductor value by
1 ? V ?
( f SW )( Δ I L ) ? V IN ?
where:
(2)
? V OUT is the output ripple voltage.
? I L is the inductor ripple current.
ESR is the total equivalent series resistance of the output
capacitor (or the parallel combination of ESR of all parallel-
connected output capacitors).
Δ V OUT ?
Δ I L
8 ( C OUT )( f SW )
L is the inductor value.
f SW is the switching frequency.
V OUT is the output voltage.
V IN is the input voltage.
? I L is the inductor ripple current, typically 1/3 of the maximum
dc load current.
Choose the output capacitor to set the desired output voltage
ripple. The ADP1822 functions with output capacitors that have
both high and low ESR. For high ESR capacitors, such as tantalum
or electrolytic types, many parallel connected capacitors may be
required to achieve the desired output ripple voltage. When
choosing an output capacitor, consider ripple current rating,
capacitance, and ESR. Make sure that the ripple current rating is
higher than the maximum inductor ripple current (ΔI L ).
Make sure that the ripple current rating of the output capacitor(s) is
greater than the maximum inductor ripple current.
For output capacitors whose ESR is much lower than the
capacitive impedance at the switching frequency, the capacitive
impedance dominates the output ripple current. In this case,
determine the ripple voltage by
(5)
where:
f SW is the switching frequency.
C OUT is the output capacitance.
Rev. D | Page 14 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1822-BL1-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For PWM, Step-Down DC-To-DC Controller With Margining And Tracking 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1822 - Boxed Product (Development Kits) |
| ADP1822-BL2-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For PWM, Step-Down DC-To-DC Controller With Margining And Tracking 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1822 - Boxed Product (Development Kits) |
| ADP1822-EVAL | 功能描述:BOARD EVALUATION FOR ADP1822 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP1823 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking |
| ADP1823ACPZ | 制造商:Analog Devices 功能描述:IC CONTROLLER STEP DOWN DUAL SMD |
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