TPS92561 Phase-Dimmable, Single-Stage Boost Controller for LED Lighting

1 Features

Simple Hysteretic Control
Compact Solution and Simple Bill Of Materials
Naturally Dimmable TRIAC and Reverse Phase Dimmers
Implements LED Drive Circuits Capable of High >90% Efficiency, >0.9 Power Factor, and <20% THD
Programmable Output Over-voltage Protection
Overtemperature Shutdown
VCC Undervoltage Lockout
8-Pin VSSOP (MSOP) With Exposed Pad

2 Applications

Off-Line TRIAC Dimmable Applications
Off-Line Non-Dimmable Lamps
Lamps Requiring the Highest Efficiency and Lowest BOM Cost
Industrial and Commercial Solid State Lighting

3 Description

The TPS92561 device is a boost controller for LED lighting applications utilizing high-voltage, low-current LEDs. A boost converter approach to lighting applications allows the creation of the smallest volume converter possible and enables high efficiencies beyond 90%. The device incorporates a current sense comparator with a fixed offset enabling a simple hysteretic control scheme free of the loop compensation issues typically associated with a boost converter. The integrated OVP and VCC regulator further simplify the design procedure and reduce external component count.

Device Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TPS92561	HVSSOP (8)	3.00 mm × 3.00 mm

For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

4 Revision History

Changes from B Revision (January 2014) to C Revision

Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section. Go

Changes from A Revision (December 2013) to B Revision

Removed product preview bannerGo

Changes from * Revision (December 2013) to A Revision

Updated figure to add AR111 lamps for closed-loop regulated e-transformer compatible, non-TRIAC dimmable boost for AR111 and MR16 lampsGo

5 Pin Configuration and Functions

DGN Package

8-Pin HVSSOP

Top View

Pin Functions

PIN		I/O	DESCRIPTION
NAME	NO.	I/O	DESCRIPTION
GATE	1	O	Gate driver output pin. Connect to the gate terminal of the low-side N-channel power FET. For off-line applications, use a gate resistance of ≥ 75 Ω.
SRC	2	I	Gate driver return. Connect to the source terminal of the low-side, N-channel power FET. By connecting SRC to the FET source, switching current spikes are not passed through the sense resistor.
VCC	3	O	Gate driver power rail. Connect a 0.47-µF minimum decoupling capacitor from this pin to SRC pin.
SEN	4	I	LED current sense pin. Current sense input. For off-line applications, connect to SEN and the current sensing resistor through an R-C filter with a time constant similar to the converter switching frequency.
GND	5	—	Ground. Connect to the system ground plane.
ADJ	6	I	LED current adjust pin. Converter reference. Can be connected to the converter rectified AC for high power factor, or to the LED output voltage for improved line regulation.
OVP	7	I	Overvoltage. Connect to resistor divider from VOUT (LED+) to detect overvoltage.
VP	8	I	Power supply of the integrated circuit (IC). Connect to an appropriate voltage source to provide power for the IC. (VP ≤ 42 V) See Example Circuits for example diagrams.
PowerPAD	—	—	Solder to printed circuit board (PCB) with or without thermal vias to enhance thermal performance. Although it can be left floating, TI recommends to connect the PowerPAD™ to GND.