- 您现在的位置：买卖IC网 > PDF目录17401 > ADP1871-0.6-EVALZ (Analog Devices Inc)BOARD EVAL FOR ADP1871-0.6 PDF资料下载
参数资料
| 型号： | ADP1871-0.6-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP1871-0.6 |
| 标准包装： | 1 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页
Data Sheet
When the desired valley current limit (I CLIM ) has been determined,
the current-sense gain can be calculated as follows:
ADP1870/ADP1871
and Figure 71. The inductor chosen must be rated to handle the
I CLIM ?
1 . 4 V
A CS ? R ON
plus the peak-to-peak inductor ripple current (see the Inductor
Selection section). In addition, the peak current value must be
where:
R ON is the channel impedance of the lower-side MOSFET.
A CS is the current-sense gain multiplier (see Table 6 and Table 7).
Although the ADP1870/ADP1871 have only four discrete current-
used to compute the worst-case power dissipation in the
49A
MAXIMUM DC LOAD
CURRENT
outline several available options for the valley current setpoint
based on various R ON values.
INDUCTOR
CURRENT
35A
39.5A
? I = 65%
OF 37A
37A
COMP
OUTPUT
? I = 45% 32.25A
Table 7. Valley Current Limit Program 1
Valley Current Level
? I = 33%
OF 30A
30A
OF 32.25A
R ON
(mΩ)
1.5
2
2.5
3
3.5
4.5
47 kΩ
A CS = 3 V/V
22 kΩ Open
A CS = 6 V/V A CS = 12 V/V
39.0
33.4
26.0
100 kΩ
A CS = 24 V/V
38.9
29.2
23.3
19.5
16.7
13
VALLEY CURRENT-LIMIT
THRESHOLD (SET FOR 25A)
COMP
OUTPUT
SWING
2.4V
5
23.4
11.7
0A
1V
5.5
21.25
10.6
Figure 72. Valley Current-Limit Threshold in Relation to Inductor Ripple Current
10
15
18
31.0
26.0
23.3
15.5
13.0
11.7
7.75
6.5
5.83
3.87
3.25
HICCUP MODE DURING SHORT CIRCUIT
A current-limit violation occurs when the current across the
1
Refer to Figure 71 for more information and a graphical representation.
39
37
35
source and drain of the lower-side MOSFET exceeds the
current-limit setpoint. When 32 current-limit violations are
detected, the controller enters idle mode and turns off the
MOSFETs for 6 ms, allowing the converter to cool down. Then,
33
31
29
27
25
23
RES = 47k ?
A CS = 3V/V
the controller reestablishes soft start and begins to cause the
output to ramp up again (see Figure 73). While the output
ramps up, COMP is monitored to determine if the violation is
still present. If it is still present, the idle event occurs again,
21
19
17
15
13
11
9
7
RES = 100k ?
A CS = 24V/V
RES = NO RES
A CS = 12V/V
RES = 22k ?
A CS = 6V/V
followed by the full-chip power-down sequence. This cycle
continues until the violation no longer exists. If the violation
disappears, the converter is allowed to switch normally,
maintaining regulation.
5
3
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
R ON (m ? )
Figure 71. Valley Current-Limit Value vs. R ON of the Lower-Side MOSFET
for Each Programming Resistor (RES)
REPEATED CURRENT-LIMIT
VIOLATION DETECTED
HS
CLIM
A PREDETERMINED NUMBER SOFT START IS
OF PULSES IS COUNTED TO REINITIALIZED TO
ALLOW THE CONVERTER MONITOR IF THE
TO COOL DOWN VIOLATION
STILL EXISTS
ZERO
CURRENT
Figure 73. Idle Mode Entry Sequence Due to Current-Limit Violation
Rev. B | Page 21 of 44
相关PDF资料 |
PDF描述 |
|---|---|
| GCC15DRYI-S13 | CONN EDGECARD 30POS .100 EXTEND |
| CT11BK50-D | 11" BLACK 50LB CABLE TIE |
| RM-2415S | CONV DC/DC 0.25W 24VIN 15VOUT |
| RBC06DCSH-S288 | CONN EDGECARD 12POS .100 EXTEND |
| RM-2412S | CONV DC/DC 0.25W 24VIN 12VOUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1871-1.0-EVALZ | 功能描述:BOARD EVAL FOR ADP1871-1.0 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 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 |
| ADP1871ACPZ-0.3-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10LFCSP 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) |
| ADP1871ACPZ-0.6-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10LFCSP 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) |
| ADP1871ACPZ-1.0-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10LFCSP 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) |
| ADP1871ARMZ-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) |
发布紧急采购，3分钟左右您将得到回复。