UCC24650 Texas instruments

UCC24650

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UCC24650

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Описание

The UCC24650 is an easy-to-use secondary-side voltage monitor that periodically measures its own VDD voltage. A relative droop of 3% from the previous reading triggers a alert signal to a receiving primary-side regulation (PSR) controller. Its low-power consumption helps achieve <5-mW standby loss in many applications. An internal 200-V MOSFET switch is applied across a ground-referenced rectifier to provide a current-limited pulse to the flyback transformer secondary winding, which couples the signal to the primary-side controller. This signal is repeated at 33 kHz until controller-driven switching activity is detected. Relative-droop detection allows scaling to any voltage between 5 and 28 V. The alert function allows very-low standby frequency to minimize switching loss and reduction of output capacitance needed to respond to a heavy load step. This monitor is used with a controller capable of detecting the signal, such as the UCC28730 PSR flyback controller. The UCC24650 also provides an enable and disable signal which can be used to control a secondary-side circuit during no-load conditions to reduce standby power loss. Such a circuit may be a synchronous rectifier controller or a relay driver, for example.

Enables Excellent Load Transient Performance and Zero Standby Power
Enables Smallest Output Capacitor for Tight ΔV_OUT
No External Components Required
<50 µA Device Current Consumption (Typical)
5-V to 28-V Output Monitoring Capability
3% Voltage Droop Detection (Patent Pending)
200-V Wake-Up Switch
Enables and Disables SR Controller, Relay Control, or Other Secondary Circuits
SOT-23 5-Pin Package

Topology	Flyback
UVLO thresholds on/off (V)	4.0/3.75V
Switching frequency (max) (kHz)	83
Features	Chip enable gating, Fast load transient support, Negative Voltage Monitoring, Wake-up Monitor
Operating temperature range (°C)	-40 to 125
Vin (max) (V)	30
Control mode	Volt-sec balance
Device type	Controllers
Rating	Catalog