ADP1048DC1-EVALZ Analog Devices, ADP1048DC1-EVALZ Datasheet - Page 16

• Manufacturer Part Number: ADP1048DC1-EVALZ
• Description: Daughter Cards & OEM Boards ADP1048 DAUGHTERCARD
• Manufacturer: Analog Devices
• Series: ADP1048r

Specifications of ADP1048DC1-EVALZ

• Rohs: yes
• Product: Daughter Cards
• Description/function: 100 kHz daughter board
• Dimensions: 40 mm x 25 mm
• Interface Type: I2C
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 3.3 V
• Factory Pack Quantity: 1
• For Use With: ADP1048

ADP1047/ADP1048
Figure 12 shows an example of the output voltage and the OVP
thresholds set. The rising and falling thresholds, FAST_OVP_
FAULT_RISE and FAST_OVP_FAULT_FALL, respectively, are
used for fast OVP protection. FAST_OVP_FAULT_RISE
corresponds to OVP
protection (see Figure 13). FAST_OVP_FAULT_FALL corre-
sponds to OVP
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
connected. In this case, it is usually recommended that the user
shut down the system to prevent damage.
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.
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)
Parameter
Debounce Time
Propagation Delay
Actions for OLP
DOWN
, which is the reset point for the fast OVP.
UP
, which is the trip point for overvoltage
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)
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1.6V
1.0V
0.5V
OVP
OVP
OVP
DOWN
FLAG
ADC INPUT RANGE = 1.6V
UP
FAST_OVP_FAULT_RISE = 435V (REG 0xFE2F)
FAST_OVP_FAULT_FALL = 400V (REG 0xFE30)
VOUT_OV_FAULT_LIMIT = 450V (REG 0x40)
VOUT_OV_WARN_LIMIT = 420V (REG 0x42)
VOUT_UV_FAULT_LIMIT = 200V (REG 0x44)
VOUT_COMMAND = 385V (REG 0x21)
VOLTAGE
OUTPUT
OVP PIN
Comments
Minimum duration of pulse to be considered
Does not include debounce
Register 0xFE02, Bits[7:6]
Figure 13. OVP Thresholds and Timing
Figure 12. Output Voltage Levels
DEBOUNCE
10µs
PROGRAMMING
FAST OVP
Data Sheet
RANGE
TIME
ADC
FULL
RANGE