参数资料
型号: ADP2323-EVALZ
厂商: Analog Devices Inc
文件页数: 22/32页
文件大小: 0K
描述: BOARD EVAL ADP2323
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: 1.2V,3.3V
电流 - 输出: 3A,3A
输入电压: 4.5 ~ 20 V
稳压器拓扑结构: 降压
频率 - 开关: 250kHz ~ 1.2MHz
板类型: 完全填充
已供物品:
已用 IC / 零件: ADP2323
ADP2323
R ESR is the equivalent series resistance of the output capacitor.
The ADP2323 uses a transconductance amplifier for the error
amplifier to compensate the system. Figure 47 shows the
Data Sheet
The following design guideline shows how to select the
compensation components, R C , C C , and C CP , for ceramic output
capacitor applications.
simplified peak current-mode control small signal circuit.
V OUT V OUT
R TOP
1.
2.
Determine the cross frequency (f C ). Generally, the f C is
between f SW /12 and f SW /6.
R C can be calculated using the following equation:
2 × π × V OUT × C OUT × f C
R C =
R BOT
g m
+
R C
C C
V COMP
C CP
+
A VI
C OUT
R ESR
R
3.
0 . 6 V × g m × A VI
Place the compensation zero at the domain pole (f P ).
C C can be determined by
Figure 47. Simplified Peak Current-Mode Control Small Signal Circuit
C C =
( R + R ESR ) × C OUT
R C
The compensation components, R C and C C , contribute a zero,
and the optional C CP and R C contribute an optional pole.
4.
C CP is optional. It can be used to cancel the zero caused by
the ESR of the output capacitor.
R BOT ? g m 1 + R C × C C × s
R BOT + R TOP
C C + C CP
T V ( s ) = × ×
R × C C × C CP
s × ? ? 1 + C
× s ? ?
R ESR × C OUT
C CP =
The closed-loop transfer equation is as follows:
?
? C C + C CP
?
?
× G vd ( s )
R C
The ADP2323 has a 10 pF capacitor internally at the
COMPx pin; therefore, if C CP is smaller than 10 pF, no
external capacitor is needed.
Rev. A | Page 22 of 32
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