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| 型号： | ADP1043A-USB-Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/72页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD DIG POWER SUPPLY |
| 标准包装： | 1 |
| 附件类型： | 连接 USB 至 I2C 的接收器 |
| 适用于相关产品： | ADP1043A |
| 相关产品： | ADP1043AACPZ-RLDKR-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLCT-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLTR-ND - IC SECONDARY SIDE CTRLR 32LFCSP |
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ADP1043A
OrFET Operation Examples
Hot Plug into a Live Bus
A new PSU is plugged into a live 12 V bus (yellow). The internal
voltage VS1 (red) is ramped up before the OrFET is turned on.
After the OrFET is turned on (green), current in the new PSU
begins to flow to the load (blue). The turn-on voltage threshold
between the new PSU and the bus is programmable.
VS3
VS1
OrFET
Short Circuit
When one of the output rectifiers fails, the bus voltage can
collapse if the OrFET is not promptly turned off. The fast
OrFET comparator is used to protect the system from this fault
event. Figure 19 shows a short circuit applied to the output
capacitors, before the OrFET. After the fast OrFET threshold for
CS2 (blue) is triggered, the OrFET (green) is turned off. In this
case, the gate driver is not very fast and takes about 500 ns. (A
larger buffer to drive the OrFET would turn it off quicker.)
removed. The internal regulation point, VS1 (red), returns to
12 V, and the OrFET (green) is reenabled. The PSU again begins
to contribute current to the load (blue).
4
VS3
3
CS2
4
OrFET
2
CS2
3
CH1 2.00V
CH2 2.00V
M10.0ms
A CH4
100mV
CH3 2.00A CH4 10.0V
Figure 17. Hot Plug into a Live Bus (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
Runaway Master
A rogue PSU on the bus (yellow) has a fault condition, and the
VS1
result is that the bus voltage increases above the OVP threshold.
CH1 2.00V CH2 2.00V
CH3 2.00A CH4 10.0V
M200.0ms
A CH4
7.5mV
The good PSU turns off the OrFET (green) and regulates its
internal voltage VS1 (red). When the rogue power supply fault
condition is removed, the bus voltage decreases. The OrFET of
the good PSU is immediately turned on and the good PSU
resumes regulating from VS3.
Figure 19. Internal Short Circuit (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
Light Load Mode Operation
PSU 1 increases its voltage at light load from 12 V to 12.1 V
(yellow). Both PSU 1 and PSU 2 are CCM, so PSU 1 sources
4
VS1
VS3
current and PSU 2 sinks current (blue). In PSU 2, after 10 ms
the accurate OrFET control turns off the OrFET to prevent
reverse current from flowing. Note that the OrFET voltage
(green) is solid during this transition because PSU 1 and PSU 2
are in CCM mode.
OrFET
3
CS2
4
VS1
OrFET
VS3
CH1 2.00V
CH2 2.00V
M50.0ms
A CH4
0mV
CH3 2.00A CH4 10.0V
Figure 18. Runaway Master (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
3
CS2
CH1 2.00V
CH2 2.00V
M5.0ms
A CH4
8.3mV
CH3 2.00A CH4 10.0V
Figure 20. Light Load Mode (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
Rev. 0 | Page 17 of 72
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