参数资料
型号: ADP1048-600-EVALZ
厂商: Analog Devices Inc
文件页数: 16/84页
文件大小: 0K
描述: BOARD EVAL ADP1048-600
标准包装: 1
主要目的: 电源管理,功率因数校正
已用 IC / 零件: ADP1048
主要属性: 600W,385V 输出,85~265VAC 输入
已供物品:
ADP1047/ADP1048
Figure 12 shows an example of the output voltage and the OVP
Data Sheet
thresholds set. The rising and falling thresholds, FAST_OVP_
FAULT_RISE and FAST_OVP_FAULT_FALL, respectively, are
1.6V
ADC INPUT RANGE = 1.6V
VOUT_OV_FAULT_LIMIT = 450V (REG 0x40)
used for fast OVP protection. FAST_OVP_FAULT_RISE
corresponds to OVP UP , which is the trip point for overvoltage
protection (see Figure 13). FAST_OVP_FAULT_FALL corre-
sponds to OVP DOWN , which is the reset point for the fast OVP.
FAST_OVP_FAULT_RISE = 435V (REG 0xFE2F)
VOUT_OV_WARN_LIMIT = 420V (REG 0x42)
FAST_OVP_FAULT_FALL = 400V (REG 0xFE30)
FAST OVP
PROGRAMMING
RANGE
When the rising threshold is triggered, the programmed action
is applied and the threshold is switched to the programmed fall-
ing threshold (if the programmed falling threshold is different
from the rising threshold).
A blanking time is applied when the thresholds are switched to
avoid spurious signals (see the timing diagram in Figure 13). A
programmable debounce time is applied to the OVP signal as
well to avoid false triggering.
The rising and falling thresholds are programmable from 1 V
to 1.5 V (at the OVP pin) using Register 0xFE2F and Register
0xFE30, respectively.
Open-Loop Protection
Open-loop protection detects differences between the OVP and
VFB pins. Identical resistor dividers are applied to these pins;
therefore, if a voltage difference is present, it means that one or
more resistors in the dividers have the wrong values or are not
1.0V
0.5V
VOUT_COMMAND = 385V (REG 0x21)
VOUT_UV_FAULT_LIMIT = 200V (REG 0x44)
Figure 12. Output Voltage Levels
OUTPUT
ADC
FULL
RANGE
connected. In this case, it is usually recommended that the user
shut down the system to prevent damage.
OVP UP
VOLTAGE
OVP PIN
The open-loop protection detects a difference in voltage in
excess of ~100 mV, which equates to approximately 6.6% of
the full-scale range.
OVP DOWN
DEBOUNCE
A debounce time of 10 μs is added to avoid false triggering. If
filtering capacitors are applied to the OVP and VFB pins, care
must be taken to make sure that the time constant difference
does not exceed 10 μs.
Table 7. Programmable Options for Open-Loop Protection (OLP)
OVP FLAG
10μs
Figure 13. OVP Thresholds and Timing
TIME
Parameter
Debounce Time
Propagation Delay
Actions for OLP
Values or Options
10 μs (fixed)
200 ns (fixed)
Immediate shutdown and wait for PSON;
disable PWM until the flag is cleared;
shut down and soft start; ignore (do nothing)
Rev. 0 | Page 16 of 84
Comments
Minimum duration of pulse to be considered
Does not include debounce
Register 0xFE02, Bits[7:6]
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