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| 型号： | ADP1828ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 24/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20LFCSP |
| 标准包装： | 1,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 720kHz |
| 占空比： | 93% |
| 电源电压： | 3 V ~ 20 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-WFQFN 裸露焊盘，CSP |
| 包装： | 带卷 (TR) |
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ADP1828
Use the larger value of C I from Equation 31 or Equation 32.
Next, calculate C I ,
Because of the finite output current drive of the error amplifier,
C I needs to be less than 10 nF. If it is larger than 10 nF, choose a
larger R TOP and recalculate R Z and C I until C I is less than 10 nF.
C I =
1
2 π R Z f Z1
(40)
f P1 =
Next, choose the high frequency pole, f P1 , to be ? of f SW .
1
f SW
2
Because C HF << C I , Equation 26 is simplified to
(33)
Because of the finite output current drive of the error amplifier,
C I needs to be less than 10 nF. If it is larger than 10 nF, choose a
larger R TOP and recalculate R Z and C I until C I is less than 10 nF.
Because C HF << C I , combining Equation 26 and Equation 36
yields
f P1 =
1
2 π R Z C HF
(34)
C HF =
1
π f SW R Z
(41)
Combine Equation 33 and Equation 34, and solve for C HF ,
Next, calculate the feedforward capacitor C FF . Assuming R FF <<
C HF =
f Z2 =
1
π f SW R Z
Type III Compensator
(35)
R TOP , then Equation 25 is simp lified to
1
2 π C FF R TOP
(42)
C FF =
G
(dB)
–90°
–1
SL
O
PE
f Z
+1
SL
O
PE
f P
–1
SL
O
PE
Solving C FF in Equation 42 yields
1
2 π R TOP f Z2
(43)
PHASE
–270°
C HF
where f Z2 is obtained from Equation 37 or Equation 38.
The feedforward resistor, R FF , can be calculated by combining
Equation 27 and Equation 36
R FF =
π C FF f SW
V OUT
R FF
R TO P
R BOT
C FF
FB
R Z
EA
C I
COMP
1
(44)
Check that the calculated component values are reasonable. For
instance, capacitors smaller than about 10 pF should be avoided.
INTERNAL
VREF
Figure 40. Type III Compensation
If the output capacitor ESR zero frequency is greater than ? of
the crossover frequency, use the Type III compensator as shown
in Figure 40. Set the poles and zeros as follows:
In addition, the ADP1828 error amplifier has a finite output
current drive, so R Z values less than 3 kΩ and C I values greater
than 10 nF should be avoided. If necessary, recalculate the compen-
sation network with a different starting value of R TOP . If R Z is too
small or C I is too big, start with a larger value of R TOP . This com-
pensation technique should yield a good working solution.
= =
f P1 = f P2 =
f Z 1 = f Z2 =
1
f SW
2
f CO f SW
4 40
1
2 π R Z C I
(36)
(37)
In general, aluminum electr olytic capacitors have high ESR, and
Type II compensation is adeq uate. However, if several aluminum
electrolytic capacitors are connected in parallel, and produce a
low effecti ve ESR, then Type III compensation is needed. In
addition, ceramic capacitors have very low ESR (only a few
or
f Z 1 = f Z2 =
f LC
2
=
1
2 π R Z C I
(38)
milliohms) making Type III compensation a better choice.
Type III compensation offers better performance than Type II
in terms of more low frequency gain and more phase margin
and less high frequency gain at the crossover frequency.
Use the lower zero frequency from Equation 37 or Equation 38.
Calculate the compensator resistor, R Z
R Z =
R TOP V RAMP f Z1 f CO
V IN f LC 2
(39)
Rev. C | Page 24 of 36
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1828-BL1-EVZ | 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1828 - Boxed Product (Development Kits) |
| ADP1828-BL2-EVZ | 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1828 - Boxed Product (Development Kits) |
| ADP1828HC-EVALZ | 功能描述:BOARD EVALUATION ADP1828HC RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP1828LC-EVALZ | 功能描述:BOARD EVALUATION ADP1828LC RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP1828YRQZ-R7 | 功能描述:IC REG CTRLR BUCK PWM VM 20-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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