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| 型号： | ADP1614ACPZ-650-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 4A 10LFCSP |
| 标准包装： | 1,500 |
| 类型： | 升压（升压） |
| 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 |
| 电流 - 输出： | 4A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
ADP1614
To determine the crossover frequency, it is important to note that
at the crossover frequency the compensation impedance (Z COMP )
Data Sheet
Capacitor C2 is chosen to cancel the zero introduced by the ESR
of the output capacitor.
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 defi-
nition of the crossover frequency) is simplified to
Solve for C2 as follows:
C2 =
R COMP
(19)
× G MEA × R COMP × G CS ×
V FB V IN
V OUT V OUT
1
2 π × f C × C OUT
2 π × f C × C OUT × ( V OUT ) 2
V FB × V IN × G MEA × G CS
4806 × f C × C OUT × ( V OUT ) 2
R COMP =
C SS = I SS
? t
A VL = ×
(15)
= 1
where:
R COMP is the compensation resistor.
f C is the crossover frequency.
Solve for R COMP as follows:
R COMP = (16)
where:
V FB = 1.245 V.
G MEA = 150 μA/V.
G CS = 7 A/V.
Therefore,
(17)
V IN
After the compensation resistor is known, set the zero formed
by the compensation capacitor and resistor to one-fourth of the
crossover frequency, or
If a low ESR, ceramic output capacitor is used for C OUT , 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 ADP1614 . For most applications, the compensation resistor
should be within the range of 1 k? to 100 k?, and the compen-
sation capacitor should be within the range of 100 pF to 10 nF.
SOFT START CAPACITOR
Upon startup (EN ≥ 1.6 V) or fault recovery, the voltage at SS
ramps up slowly by charging the soft start capacitor (C SS ) with
an internal 5.5 μA current source (I SS ). As the soft start
capacitor charges, it limits the peak current allowed by the part
to prevent excessive overshoot at startup. Use the following
equation to determine the necessary value of the soft start
capacitor (C SS ) for a specific overshoot and start-up time when
the part is at the current limit with maximum load:
(20)
V SS
where:
I SS = 5.5 μA (typical).
Δ t is the start-up time at the current limit.
V SS = 1.23 V (typical).
If the applied load does not place the part at the current limit,
2
C COMP =
π × f C × R COMP
where C COMP is the compensation capacitor.
ERROR
AMPLIFIER
(18)
the value of C SS can be reduced. A 68 nF soft start capacitor
results in negligible input current overshoot at startup and,
therefore, is suitable for most applications. If an unusually large
output capacitor is used, a longer soft start period is required to
prevent input inrush current.
FB 2
V BG
g m
COMP
1
R COMP
C2
However, if fast startup is required, the soft start capacitor can
be reduced or removed, which allows the ADP1614 to start
quickly but with greater peak switch current .
C COMP
Figure 34. Compensation Components
Rev. A | Page 16 of 20
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