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参数资料
| 型号： | ADP1822-EVAL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADP1822 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 10A |
| 输入电压： | 9 ~ 15 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1822 |
| 相关产品： | ADP1822ARQZ-R7DKR-ND - IC REG CTRLR BUCK PWM VM 24-QSOP ADP1822ARQZ-R7CT-ND - IC REG CTRLR BUCK PWM VM 24-QSOP ADP1822ARQZ-R7TR-ND - IC REG CTRLR BUCK PWM VM 24-QSOP |
f ZC =
f CO f 1
2 π ( C COMP )( R COMP )
f ZC =
f LC 1
2 π ( C COMP )( R COMP )
( R TOP )( V RAMP )( f ZFF )( f CO )
V IN ( f LC ) 2
( R TOP )( f SW ) 2 ( L )( C )
R COMP ? 0 . 0705 (47)
ADP1822
Choose the compensation capacitor to set the compensation
zero, f ZC , to the lesser of 1/4 of the crossover frequency or 1/2 of
the LC resonant frequency, or
= SW = (36)
4 40
or
= (37)
2
Data Sheet
R COMP = (46)
where f ZFF is the feed-forward zero frequency and is 1/7 of the
crossover frequency. Simplify the following equation:
V IN
Choose the compensation capacitor to set the compensation
zero, f ZC , to 1/2 of the LC resonant frequency, or
C COMP =
f ZC =
f LC
Solving for C COMP ,
4
2 π ( f CO )( R COMP )
(38)
=
2
Solving for C COMP ,
1
2 π ( C COMP )( R COMP )
(48)
6 . 37
( f SW )( R COMP )
C COMP =
2
2 π ( f LC )( R COMP )
In terms of the switching frequency and combining the constants,
C COMP ? (39)
or
(49)
Choose the feed-forward capacitor, C FF , to set the feed-forward
zero at 1/7 of the crossover frequency
C COMP =
2
2 π ( f LC )( R COMP )
(40)
f ZFF =
f CO
7
(50)
or whichever is greater.
or
Choose the feed-forward capacitor, C FF , to set the feed-forward
zero at 1/7 of the crossover frequency
f CO =
7
2 π ( R TOP ) ( C FF )
(51)
C FF =
or
f ZFF =
f CO
7
(41)
Simplifying and solving for C FF ,
11 . 14
( R TOP )( f SW )
(52)
f CO =
f CO =
C FF =
R FF =
7
2 π ( R TOP ) ( C FF )
Simplifying and solving for C FF ,
11 . 14
( R TOP )( f SW )
Choose the feed-forward resistor, R FF , to set the condition
(42)
(43)
Choose the feed-forward resistor, R FF , to set the condition
1
7 ( 2 π ) ( R FF )( C FF )
Simplifying and solving for R FF ,
0 . 227
( f SW )( C FF )
(53)
(54)
f CO =
1
7 ( 2 π ) ( R FF )( C FF )
(44)
SETTING THE SOFT START PERIOD
The ADP1822 uses an adjustable soft start to limit the output
R FF =
0 . 227
( f SW )( C FF )
? ?
V CSS = 0 . 8 V ? 1 ? e RC SS
(55)
? ?
0 . 6 V = 0 . 8 V ? 1 ? e 100 kΩ C SS ) ? (56)
Simplifying and solving for R FF ,
(45)
Compensation Using Both the ESR and Feed-Forward Zeros
If the output capacitor ESR zero frequency falls between 1/2 of
the crossover frequency to 2× the crossover frequency, use the
circuit shown in Figure 19, such that the ESR zero, along with a
feed-forward network, stabilizes the regulator. In this case, the
feed-forward zero is set to 1/7 of the crossover frequency, and
the feed-forward pole is set to the same frequency as the ESR zero.
Choose the compensation resistor, R COMP , to set the crossover
frequency by
voltage ramp-up period, limiting the input inrush current. The
soft start is set by selecting the capacitor, C SS , from SS to GND.
The ADP1822 charges C SS to 0.8 V through an internal resistor.
The voltage on C SS while it is charging is
1
?
? ?
? ?
where R is the internal 100 k? resistor. The soft start period, t SS ,
is achieved when V CSS = 0.6 V, or
t SS
? ?
? ?
Rev. D | Page 18 of 24
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相关代理商/技术参数 |
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| ADP1823-EVAL | 功能描述:BOARD EVAL FOR ADP1823 RoHS:否 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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