参数资料
型号: ADP2325ACPZ-R7
厂商: Analog Devices Inc
文件页数: 23/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32LFCSP
标准包装: 1
PWM 型: 电流模式
输出数: 2
频率 - 最大: 1.2MHz
占空比: 90%
电源电压: 4.5 V ~ 20 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 32-WFQFN 裸露焊盘,CSP
包装: 标准包装
其它名称: ADP2325ACPZ-R7DKR
? 1 +
?
2 × π × f Z
V OUT ( s )
= A VI × R × ?
?
G VD ( s ) =
? 1 +
?
2 × π × f P
?
?
f Z =
f P =
2 × π × V OUT × C OUT × f C
R C =
( R + R ESR ) × C OUT
C C =
R ESR × C OUT
C CP =
DataSheet
COMPENSATION COMPONENTS DESIGN
In peak current mode control, the power stage can be simplified
to a voltage controlled current source supplying current to the
output capacitor and load resistor. It is composed of one domain
pole and a zero contributed by the output capacitor ESR. The
control-to-output transfer function is shown in the following
equations:
? s ?
? ?
V COMP ( s ) ? s ?
? ?
1
2 × π × R ESR × C OUT
1
2 × π × ( R + R ESR ) × C OUT
where:
A VI = 8.33 A/V.
R is the load resistance.
C OUT is the output capacitance.
R ESR is the equivalent series resistance of the output capacitor.
The ADP2325 uses a transconductance amplifier for the error
amplifier to compensate the system. Figure 51 shows the
simplified peak current mode control small signal circuit.
ADP2325
The following design guidelines show how to select the compen-
sation components, R C , C C , and C CP , for ceramic output capacitor
applications.
4. Determine the cross frequency (f C ). Generally, the f C is
between f SW /12 and f SW /6.
5. R C can be calculated by using the following equation:
0 . 6 V × g m × A VI
6. Place the compensation zero at the domain pole (f P ).
C C can be determined by
R C
7. C CP is optional. It can be used to cancel the zero caused by
the ESR of the output capacitor.
R C
The ADP2325 has an internal 10 pF capacitor at the COMPx
pin; therefore, if C CP is smaller than 10 pF, no external capacitor
is required.
V OUT
R TOP
V OUT
g m
V COMP
+
A VI
C OUT
R BOT
+
R C
C CP
R ESR
R
C C
Figure 51. Simplified Peak Current Mode Control Small Signal Circuit
The compensation components, R C and C C , contribute a zero,
and the optional C CP and R C contribute an optional pole.
The closed-loop transfer equation is as follows:
R × C C × C CP
s × ? ? 1 + C
× s ? ?
T V (s) =
R BOT
R BOT + R TOP
×
? g m
C C + C CP
×
?
1 + R C × C C × s
? C C + C CP
?
?
× G VD (s)
Rev. A | Page 23 of 32
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