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参数资料
| 型号： | ADP1883-0.3-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/40页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP1883 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1883 |
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ADP1882/ADP1883
PROGRAMMING RESISTOR (RES) DETECT CIRCUIT
Upon startup, one of the first blocks to become active is the RES
detect circuit. This block powers up before a soft start begins. It
and is programmed to identify four possible resistor values:
47 kΩ, 22 kΩ, open, and 100 kΩ.
ADP1882
Q1
DRVH
SW
Q2
VALLEY CURRENT-LIMIT SETTING
The architecture of the ADP1882/ADP1883 is based on valley
current-mode control. The current limit is determined by three
components: the R ON of the lower-side MOSFET, the error ampli-
fier output voltage swing (COMP), and the current-sense gain.
The COMP range is internally fixed at 1.5 V. The current-sense
gain is programmable via an external resistor at the DRVL pin
(see the Programming Resistor (RES) Detect Circuit section).
The R ON of the lower-side MOSFET can vary over temperature
and usually has a positive T C (meaning that it increases with
temperature); therefore, it is recommended that the current-
DRVL
CS GAIN
RES
sense gain resistor be programmed based on the rated R ON of
the MOSFET at 125°C.
I CLIM = I LOAD × ? ? 1 ? K I ? ?
PROGRAMMING
Figure 68. Programming Resistor Location
The RES detect circuit digitizes the value of the resistor at the
DRVL pin (Pin 6). An internal ADC outputs a 2-bit digital code
that is used to program four separate gain configurations in the
current-sense amplifier (see Figure 69). Each configuration
corresponds to a current-sense gain (A CS ) of 3 V/V, 6 V/V, 12 V/V,
and 24 V/V, respectively (see Table 5 and Table 6). This variable
is used for the valley current-limit setting, which sets up the
appropriate current-sense signal gain for a given application
and sets the compensation necessary to achieve loop stability
(see the Valley Current-Limit Setting and Compensation
Network sections).
Because the ADP1882/ADP1883 are based on valley current
control, the relationship between I CLIM and I LOAD is as follows:
? 2 ?
where:
I CLIM is the desired valley current limit.
I LOAD is the current load.
K I is the ratio between the inductor ripple current and the
desired average load current (see Figure 10).
Establishing K I helps to determine the inductor value (see the
RIPPLE CURRENT =
I LOAD
3
CS
SW
LOAD CURRENT
AMP
PGND
CS GAIN SET
DRVL
ADC
0.4V
VALLEY CURRENT LIMIT
Figure 70. Valley Current Limit to Average Current Relation
When the desired valley current limit (I CLIM ) has been determined,
the current-sense gain can be calculated by using the following
I CLIM =
RES
Figure 69. RES Detect Circuit for Current-Sense Gain Programming
Table 5. Current-Sense Gain Programming
Resistor (kΩ) A CS (V/V)
47 3.25
22 6.5
expression:
1 . 5 V
A CS × R ON
where:
A CS is the current-sense gain multiplier (see Table 5 and Table 6).
R ON is the channel impedance of the lower-side MOSFET.
Open
100
26
13
Rev. 0 | Page 20 of 40
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1883-1.0-EVALZ | 功能描述:EVAL BOARD FOR ADP1883 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 |
| ADP1883ARMZ-0.3-EVALZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Synchronous Current-Mode with Constant On-Time,PWM Buck Controller |
| ADP1883ARMZ-0.3-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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) |
| ADP1883ARMZ-0.6-EVALZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Synchronous Current-Mode with Constant On-Time,PWM Buck Controller |
| ADP1883ARMZ-0.6-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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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