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参数资料
| 型号： | ADP1883-0.6-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/40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： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1883 |
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ADP1882/ADP1883
Although the ADP1882/ADP1883 have only four discrete current-
outline several available options for the valley current setpoint
based on various R ON values.
Table 6. Valley Current Limit Program 1
Valley Current Level
and Figure 71. The inductor chosen must be rated to handle the
plus the peak-to-peak inductor ripple current (see the Inductor
Selection section). In addition, the peak current value must be
used to compute the worst-case power dissipation in the
MOSFETs (see Figure 72).
R ON
(mΩ)
47 kΩ
A CS = 3.4 V/V
22 kΩ
A CS = 6.6 V/V
Open
A CS = 26.7 V/V
100 kΩ
A CS = 13.4 V/V
MAXIMUM DC LOAD
49A
1.5
38.5
CURRENT
2
2.5
3
38.46
28.8
23.1
19.2
INDUCTOR
CURRENT
35A
39.5A
Δ I = 65%
OF 37A
37A
COMP
OUTPUT
Δ I = 45% 32.25A
3.5
4.5
32.97
25.64
16.5
12.8
Δ I = 33%
OF 30A
30A
OF 32.25A
5
5.5
23.08
20.98
11.5
10.5
VALLEY CURRENT-LIMIT
2.4V
10
23.08
11.54
5.77
THRESHOLD (SET FOR 25A)
15
18
30.769
25.641
15.38
12.82
7.692
6.41
3.85
3.21
COMP
OUTPUT
SWING
1
Refer to Figure 71 for more information and a graphical representation.
39
37
RES = 47k ?
0A
0.9V
35
33
31
29
27
25
A CS = 6.6V/V
Figure 72. Valley Current-Limit Threshold in Relation to Inductor Ripple Current
HICCUP MODE DURING SHORT CIRCUIT
A current-limit violation occurs when the current across
23
21
19
17
15
13
11
9
7
RES = OPEN
A CS = 26.7V/V
RES = 100k ?
A CS = 13.4V/V
RES = 22k ?
A CS = 3.4V/V
the source and drain of the lower-side MOSFET exceeds the
current-limit setpoint. When 32 current-limit violations are
detected, the controller enters the idle mode and turns off the
MOSFETs for 6 ms, allowing the converter to cool down. Then,
the controller reestablishes soft start and begins to cause the
output to ramp up again (see Figure 73). While the output
5
3
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18
ramps up, COMP is monitored to determine if the violation is
still present. If it is still present, the idle event occurs again,
R ON (m ? )
Figure 71. Valley Current-Limit Value vs. R ON of the Lower-Side MOSFET
for Each Programming Resistor (RES)
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.
REPEATED CURRENT-LIMIT
VIOLATION DETECTED
HS
A PREDE TERMINED NUMBER
SOFT START IS
CLIM
OF PULS ES IS COUNTED TO REINITIALIZED TO
ALLO W THE CONVERTER MONITOR IF THE
TO COOL DOWN
VIOLATION
STILL EXISTS
ZERO
CURRENT
Figure 73. Idle Mode Entry Sequence Due to Current-Limit Violations
Rev. 0 | Page 21 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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