Mp3378e Protection Pin Upd
In this article, we will focus on the protection pin (UPD) of the MP3378E and provide a comprehensive guide on its functionality, configuration, and usage.
The pin also monitors for a minimum operating voltage. If the OVP pin voltage is too low, the step-up converter fails to start. Typical Protection Pin Specifications Value (Typ) OVP Threshold (Rising) VOVP_OVcap V sub cap O cap V cap P _ cap O cap V end-sub 1.23V Triggers shutdown if exceeded. OVP Hysteresis
It includes specific sensing to detect shorts in the power path (inductor or diode), which are typically catastrophic in standard boost converters. 3. Intelligent Thermal & Current Management mp3378e protection pin upd
: If the voltage exceeds a programmable threshold (typically around 1.23V1.23 cap V
The MP3378E uses a resistor divider from VOUT (boost output) to the PROT pin. If the divider is incorrectly calculated or damaged: In this article, we will focus on the
Specialized protection for inductor and diode short circuits.
| Mode | Condition | IC Behavior | | :--- | :--- | :--- | | | External capacitor (C_PROT) charges via internal 5µA current source. | Boost switching disabled until voltage > 0.8V. | | Normal Operation | Voltage set by external resistor divider from VOUT. | OVP threshold = 2.0V. Switching stops if >2.0V. | | Fault Latch | PROT > 2.5V (e.g., short to VCC) or < 0.4V. | IC latches off. Requires VCC power cycle. | Intelligent Thermal & Current Management : If the
stands for Universal Protection Detect . Unlike standard fault pins (e.g., OVP, SCP), the UPD pin is a dual-function, configurable protection input . It allows the designer to connect various external fault detection circuits (e.g., over-temperature, over-voltage, external over-current, or even mechanical switch sensors) into a single, unified shutdown mechanism for the MP3378E.
If one string is faulty, grounding that specific LED channel pin through a resistor can sometimes trick the IC into ignoring that string's fault. Technical Specifications
This often indicates the OVP is triggering. Check if an LED string is disconnected or if your OVP resistor divider is set too low for the required output voltage.