INDUSTRY COMPONENT

UVLO (Under-Voltage Lockout) Circuit

UVLO circuit prevents gate driver IC operation below safe voltage thresholds to protect power electronics.

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Component Specifications

Definition
An Under-Voltage Lockout (UVLO) circuit is a protection mechanism integrated into gate driver ICs that monitors the supply voltage and disables the output when voltage falls below a predetermined threshold. This prevents unreliable switching, shoot-through conditions, and damage to power semiconductors in applications like motor drives, inverters, and power supplies.
Working Principle
The UVLO circuit continuously compares the supply voltage against a reference voltage using a comparator. When VCC drops below the UVLO threshold, the comparator output triggers a latch or logic circuit that disables the gate driver outputs, putting them in a high-impedance or logic-low state. Hysteresis is typically incorporated to prevent oscillation near the threshold voltage.
Materials
Semiconductor silicon (CMOS/BiCMOS process), gold bonding wires, copper leadframes, epoxy molding compound
Technical Parameters
  • Hysteresis 200-500mV typical
  • Response Time <1μs
  • Supply Voltage Range 10V to 20V
  • Operating Temperature -40°C to +125°C
  • UVLO Threshold Voltage Typically 8-12V (adjustable in some ICs)
Standards
ISO 26262, IEC 60747, AEC-Q100

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for UVLO (Under-Voltage Lockout) Circuit.

under-voltage lockout UVLO circuit gate driver protection power electronics safety voltage monitoring circuit industrial electronics UVLO (Under-Voltage Lockout) Circuit UVLO (Under-Voltage Lockout) Circuit in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Gate Driver IC

An integrated circuit that provides the necessary voltage and current to drive the gate of power transistors (MOSFETs, IGBTs) in switching applications.

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Engineering Analysis

Risks & Mitigation
  • Insufficient UVLO threshold causing premature shutdown
  • Lack of hysteresis leading to output oscillation
  • Slow response time during voltage dips
FMEA Triads
Trigger: Power supply voltage drop below minimum operating level
Failure: Gate driver outputs disabled, system shutdown
Mitigation: Implement proper power supply design with adequate headroom and filtering
Trigger: UVLO comparator malfunction
Failure: False triggering or failure to trigger
Mitigation: Use ICs with built-in self-test features and follow manufacturer's layout guidelines
Trigger: Inadequate hysteresis design
Failure: Output oscillation during voltage transients
Mitigation: Select ICs with appropriate hysteresis or add external components as specified

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% on UVLO threshold voltage
Test Method
Power supply ramp testing with oscilloscope monitoring of enable/disable transitions

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What happens when UVLO activates in a gate driver?

When UVLO activates, the gate driver outputs are disabled (typically pulled low or high-impedance), preventing MOSFET/IGBT switching until voltage returns above the threshold with hysteresis.

Can UVLO thresholds be adjusted?

Some gate driver ICs offer adjustable UVLO thresholds through external resistors, while most have fixed thresholds optimized for specific applications.

Why is hysteresis important in UVLO circuits?

Hysteresis prevents oscillation and unstable operation when supply voltage fluctuates near the threshold, ensuring clean transitions between enabled and disabled states.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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