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参数资料
| 型号： | ADP1878ACPZ-0.6-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 24/40页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 14LFCSP |
| 标准包装： | 1,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 65% |
| 电源电压： | 2.95 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： | 14-WFDFN 裸露焊盘，CSP |
| 包装： | 带卷 (TR) |
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( ?? ?????? ? 0.6 V )
?? ?? = ?? ?? ×
?? ????????
??? ?? = ?? ?? × ?? ????????
≈
( ?? ???? ? ?? ?????? ) ?? ??????
?? =
×
ADP1878/ADP1879
APPLICATIONS INFORMATION
FEEDBACK RESISTOR DIVIDER
The required resistor divider network can be determined for a
given V OUT value because the internal band gap reference (V REF )
is fixed at 0.6 V. Selecting values for R T and R B determine the
minimum output load current of the converter. Therefore, for a
given value of R B , the R T value can be determined through the
following expression:
0.6 V
INDUCTOR SELECTION
The inductor value is inversely proportional to the inductor
ripple current. The peak-to-peak ripple current is given by
where K I is typically 0.33. 3
The equation for the inductor value is given by
where: ??? ?? × ?? ???? ?? ????
V IN is the high voltage input.
V OUT is the desired output voltage.
f SW is the controller switching frequency (300 kHz, 600 kHz, and
1.0 MHz).
When selecting the inductor, choose an inductor saturation
rating that is above the peak current level, and then calculate
the inductor current ripple (see the Valley Current-Limit
Data Sheet
Table 8. Recommended Inductors
L DCR I SAT Dimensions Model
(μH) (mΩ) (A) (mm) Manufacturer Number
0.12 0.33 55 10.2 × 7 Würth Elek. 744303012
0.22 0.33 30 10.2 × 7 Würth Elek. 744303022
0.47 0.8 50 14.2 × 12.8 Würth Elek. 744355147
0.72 1.65 35 10.5 × 10.2 Würth Elek. 744325072
0.9 1.6 32 14 × 12.8 Würth Elek. 744318120
1.2 1.8 25 10.5 × 10.2 Würth Elek. 744325120
1.0 3.8 16 10.2 × 10.2 Würth Elek. 7443552100
1.4 3.2 24 14 × 12.8 Würth Elek. 744318180
2.0 2.6 23 10.2 × 10.2 Würth Elek. 7443551200
0.8 27.5 Sumida CEP125U-0R8
OUTPUT RIPPLE VOLTAGE (ΔV RR )
The output ripple voltage is the ac component of the dc output
voltage during steady state. For a ripple error of 1.0%, the output
capacitor value needed to achieve this tolerance can be determined
using the following equation. (Note that an accuracy of 1.0% is
possible during steady state conditions only, not during load
transients.)
ΔV RR = (0.01) × V OUT
OUTPUT CAPACITOR SELECTION
The primary objective of the output capacitor is to facilitate the
reduction of the output voltage ripple; however, the output capacitor
also assists in the output voltage recovery during load transient
events. For a given load current step, the output voltage ripple
generated during this step event is inversely proportional to the
value chosen for the output capacitor. The speed at which the
output voltage settles during this recovery period depends on
52
50
48
46
44
42
40
38
ΔI = 50%
ΔI = 40%
where the crossover frequency (loop bandwidth) is set. This
crossover frequency is determined by the output capacitor, the
equivalent series resistance (ESR) of the capacitor, and the
compensation network.
1
?? ?????? = ??? ?? × ?
?
??? ????????
?? ?????? = 2 ×
36
34
32
30 ΔI = 33%
28
26
24
22
20
18
16
14
12
10
8
6 8 10 12 14 16 18 20 22 24 26 28 30
VALLEY CURRENT LIMIT (A)
Figure 81. Peak Inductor Current vs. Valley Current Limit for 33%, 40%, and
50% of Inductor Ripple Current
To calculate the small signal voltage ripple (output ripple voltage) at
the steady state operating point, use the following equation:
8 × ?? ???? × [ ??? ???????????? ? ( of × ?????? )]
where ESR is the equivalent series resistance ??? ?? the output
capacitors.
To calculate the output load step, use the following equation:
?? ???? × ???? that V ( ??? is × ?????? )
where Δ V DROOP is the amount ?????????? ? OUT ???????? allowed to ? deviate for
a given positive load current step (Δ I LOAD ).
Rev. B | Page 24 of 40
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| ADP1878ACPZ-1.0-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 14LFCSP 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) |
| ADP1879-0.3-EVALZ | 功能描述:BOARD EVAL FOR ADP1879-0.3 RoHS:是 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 |
| ADP1879-0.6-EVALZ | 功能描述:BOARD EVAL FOR ADP1879-0.6 RoHS:是 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 |
| ADP1879-1.0-EVALZ | 功能描述:BOARD EVAL FOR ADP1879-1.0 RoHS:是 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 |
| ADP1879ACPZ-0.3-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 14LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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