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| 型号： | ADP1613ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SEPIC ADJ 2A 8MSOP |
| 设计资源： | Powering a 30V DAC from a 3V supply (CN0193) |
| 标准包装： | 1 |
| 类型： | 升压（升压），Sepic |
| 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，1.3MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MSOP |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 配用： | ADP1613-12-EVALZ-ND - BOARD EVAL FOR ADP1613 |
| 其它名称： | ADP1613ARMZ-R7DKR |
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Data Sheet
To determine the crossover frequency, it is important to note
that, at that frequency, the compensation impedance (Z COMP )
ADP1612/ADP1613
The capacitor, C2, is chosen to cancel the zero introduced by
output capacitance, ESR.
ESR × C OUT
is dominated by a resistor, and the output impedance (Z OUT ) is
dominated by the impedance of an output capacitor. Therefore,
when solving for the crossover frequency, the equation (by
definition of the crossover frequency) is simplified to
Solve for C2 as follows:
C2 =
R COMP
(19)
A VL =
× × G MEA × R COMP × G CS ×
= 1
V FB V IN
V OUT V OUT
1
2 π × f C × C OUT
where:
f C is the crossover frequency.
R COMP is the compensation resistor.
Solve for R COMP ,
(15)
For low ESR output capacitance such as with a ceramic
capacitor, C2 is optional. For optimal transient performance,
R COMP and C COMP might need to be adjusted by observing the
load transient response of the ADP1612/ADP1613. For most
applications, the compensation resistor should be within the
range of 4.7 k? to 100 k? and the compensation capacitor
should be within the range of 100 pF to 3.3 nF.
SOFT START CAPACITOR
Upon startup (EN ≥ 1.6 V), the voltage at SS ramps up slowly
2 π × f C × C OUT × ( V OUT ) 2
V FB × V IN × G MEA × G CS
4746 × f C × C OUT × ( V OUT ) 2
C SS = I SS
? t
R COMP = (16)
where:
V FB = 1.235 V.
G MEA = 80 μA/V.
G CS = 13.4 A/V.
R COMP = (17)
V IN
Once the compensation resistor is known, set the zero formed
by the compensation capacitor and resistor to one-fourth of the
crossover frequency, or
by charging the soft start capacitor (C SS ) with an internal 5 μA
current source (I SS ). As the soft start capacitor charges, it limits
the peak current allowed by the part to prevent excessive over-
shoot at startup. The necessary soft start capacitor, C SS , for a
specific overshoot and start-up time can be calculated for the
maximum load condition when the part is at current limit by:
(20)
V SS
where:
I SS = 5 μA (typical).
V SS = 1.2 V.
Δ t = startup time, at current limit.
C COMP =
2
π × f C × R COMP
where C COMP is the compensation capacitor.
(18)
If the applied load does not place the part at current limit, the
necessary C SS will be smaller. A 33 nF soft start capacitor results
in negligible input current overshoot at start up, and therefore is
suitable for most applications. However, if an unusually large
FB 2
ERROR
AMPLIFIER
COMP
output capacitor is used, a longer soft start period is required
to prevent input inrush current.
V BG
g m
1
R COMP
C COMP
C2
Conversely, if fast startup is a requirement, the soft start
capacitor can be reduced or removed, allowing the
ADP1612/ADP1613 to start quickly, but allowing greater
peak switch current .
Figure 35. Compensation Components
Rev. D | Page 15 of 28
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1613ARMZ-R7 | 制造商:Analog Devices 功能描述:IC STEP-UP DC/DC SWITCHING CONV MSOP-8 |
| ADP1613-BL1-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board Operates In Pulse-Width Modulation Current Mode 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1613 - Boxed Product (Development Kits) 制造商:Analog Devices 功能描述:650 kHz/1.3 MHz Step-Up Converter Blank |
| ADP1613-BL2-EVZ | 制造商:Analog Devices 功能描述:BLANK SEPIC DEMO BOARD - Boxed Product (Development Kits) |
| ADP1613-BL3-EVZ | 功能描述:EVAL BLANK ADISIMPOWER ADP1613 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ADP1614 | 制造商:AD 制造商全称:Analog Devices 功能描述:650 kHz/1.3 MHz, 4 A, Step-Up |
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