ADP2442-EVALZ Analog Devices, ADP2442-EVALZ Datasheet - Page 18

• Manufacturer Part Number: ADP2442-EVALZ
• Description: Power Management IC Development Tools Eval board
• Manufacturer: Analog Devices
• Type: DC/DC Converters, Regulators & Controllersr
• Series: ADP2442r

Specifications of ADP2442-EVALZ

• Rohs: yes
• Tool Is For Evaluation Of: ADP2442
• Factory Pack Quantity: 1

CURRENT-LIMIT AND SHORT-CIRCUIT PROTECTION
The
the current sensed across the low-side power MOSFET to the
internally set reference current. If the sensed current exceeds
the reference current, the high-side power MOSFET is not
turned on in the next cycle and the low-side power MOSFET
stays on until the inductor current ramps down below the
current-limit level.
ADP2442
V
R1
R2
IN
ADP2442
Figure 56. Precision Enable Used as a Programmable UVLO
has a current-limit comparator that compares
VIN
EN
FREQ AGND COMP
ADP2442
BST
SW
FB
V
OUT
Rev. 0 | Page 18 of 36
If the output is overloaded and the peak inductor current exceeds
the preset current limit for more than eight consecutive clock
cycles, the hiccup mode current-limit condition occurs. The
output goes to sleep for 6 ms, during which time the output is
discharged, the average power dissipation is reduced, and the
part wakes up with a soft start period. If the current-limit condition
is triggered again, the output goes to sleep and wakes up after 6 ms.
Figure 37 shows the current-limit hiccup mode when the output is
shorted to ground.
THERMAL SHUTDOWN
If the
thermal shutdown circuit turns off the switching regulator. Extreme
junction temperatures can be the result of high current operation,
poor circuit board design, or high ambient temperature. A 25°C
hysteresis is included so that when a thermal shutdown occurs,
the
junction temperature drops below 125°C. Soft start is active
upon each restart cycle.
ADP2442
ADP2442
does not return to normal operation until the
junction temperature rises above 150°C, the
Data Sheet