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参数资料
| 型号： | ADP2114-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 29/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 3.3V/1.8V |
| 设计资源： | Powering AD9268 with ADP2114 for Increased Efficiency (CN0137) |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 可调 |
| 电流 - 输出： | 4A，2A |
| 输入电压： | 2.75 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz，600kHz，1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2114 |
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2 × π × f CROSS × C OUT V
Data Sheet
The control loop can be broken down into the following three
sections:
? V OUT to V COMP
? V COMP to I L
? I L to V OUT
Correspondingly, there are three transfer functions:
ADP2114
At the crossover frequency, the gain of the open-loop transfer
function is unity. This yields Equation 16 for the compensation
network impedance at the crossover frequency.
Z COMP ( f CROSS ) = × OUT (16)
g m × G CS V REF
To ensure that there is sufficient phase margin at the crossover
= REF × g m × Z COMP (s)
V COMP (s)
V OUT (s)
V
V OUT
(10)
frequency, place the compensator zero at 1/8 of the crossover
frequency, as shown in Equation 17.
f
I L (s)
V COMP (s)
= G CS
(11)
f ZERO =
1
2 × π × R COMP × C COMP
≈ CROSS
8
(17)
= Z FILT (s)
V OUT (s)
1 + s × R COMP × C COMP
s × C COMP
? ( 2 π ) F CROSS ? ? C OUT V OUT
R COMP = 0 . 9 × ? ?
? × ?
?
(18)
? G m G CS
V REF
? ? ?
C COMP =
1
2 × π × f ZERO × R COMP
(12)
I L (s)
where:
g m is the transconductance of the error amplifier, 550 μs.
G CS is the current sense gain, 4 A/V.
V OUT is the output voltage of the converter.
V REF is the internal reference voltage of 0.6 V.
Z COMP (s) is the impedance of the RC compensation network that
forms a pole at origin and a zero as expressed in Equation 13.
Z COMP (s) = (13)
Z FILT ( s ) is the impedance of the output filter and is expressed as
Solving Equation 16 and Equation 17 simultaneously yields the
value for the compensation resistor and compensation
capacitor, as shown in Equation 18 and Equation 19.
?
? ? ?
(19)
The capacitor C C2 (as shown in Figure 77) forms a pole with the
compensation resistor, R COMP , in the feedback loop to ensure
that the loop gain keeps rolling off well beyond the unity-gain
crossover frequency. The value of C C2 , if used, is typically set to
1/40 of the compensation capacitor, C COMP .
Z FILT (s) =
R LOAD
1 + s × R LOAD × C OUT
(14)
where s is angular frequency that can be written as s = 2πf.
The overall loop gain, H(s), is obtained by multiplying the three
transfer functions previously mentioned as follows:
H(s) = g M × G CS ×
V REF
V OUT
× Z COMP (s) × Z FILT (s)
(15)
When the switching frequency (f SW ), output voltage (V OUT ), output
inductor (L), and output capacitor (C OUT ) values are selected,
the unity crossover frequency of 1/12 (approximately) the
switching frequency can be targeted.
Rev. B | Page 29 of 40
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| ADP2114-EVALZ | 制造商:Analog Devices 功能描述:4A Step-Down DC/DC Converter Evaluation 制造商:Analog Devices 功能描述:ADP2114, DC TO DC CONVERTER, STEP DOWN, EVAL BOARD |
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| ADP2116ACPZ-R7 | 功能描述:IC REG BUCK SYNC ADJ 32LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| ADP2116ACPZ-R7 | 制造商:Analog Devices 功能描述:DC/DC CONVERTER IC |
| ADP2116-BL1-EVZ | 功能描述:EVAL BOARD FOR ADP2116 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 |
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