TPS61193 High-Performance Three-Channel LED Driver
1 Features
- Input voltage operating range 4.5 V to 40 V
- Three high-precision current sinks
- Current matching 1% (typical)
- LED String current up to 100 mA per channel
- Outputs can be combined externally for higher current capability
- High dimming ratio of 10 000:1 at 100 Hz
- Integrated boost/SEPIC for LED string power
- Output voltage up to 45 V
- Switching frequency 300 kHz to 2.2 MHz
- Switching synchronization input
- Spread spectrum for lower EMI
- Extensive fault detection features
- Fault output
- Input voltage OVP, UVLO, and OCP
- Open and shorted LED fault detection
- Thermal shutdown
- Minimum number of external components
Simplified
Schematic
2 Applications
- Industrial backlighting systems in control panels
- Industrial PC
- Test and measurement equipment
3 Description
The TPS61193 is a high-efficiency, low-EMI, easy-to-use LED driver with flexibility to support a wide range of applications. It has three high-precision current sinks that can be combined for higher current capability.
The TPS61193 has an integrated DC-DC supporting both boost and SEPIC mode operation. The converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions. For EMI control the DC-DC converter supports spread spectrum for switching frequency and an external synchronization with dedicated pin.
The TPS61193 has wide input voltage range from 4.5 V to 40 V for robust support of different types of applications. The TPS61193 integrates extensive fault detection features. The device supports PWM brightness dimming ratio of 10 000:1 for 100-Hz input PWM frequency.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| TPS61193 | HTSSOP (20) | 6.50 mm × 4.40 mm |
System
Efficiency4 Revision History
Changes from Revision B (June 2017) to Revision C (February 2021)
- Updated the numbering format for tables, figures and cross-references throughout the document Go
- Updated Section 7.4.1 sectionGo
Changes from Revision A (September 2016) to Revision B (June 2017)
- Enhanced pin descriptions for pins 3, 10, and 16 in Pin Functions tableGo
- Deleted "IOUT = 100 mA" from tON/OFF row of Section 6.9 Go
- Changed "0.5" from MAX to TYP column in tON/OFF row of Section 6.9 ; add note 1 to Section 6.9 Go
- Added table note 1 for Section 6.10 Go
- Deleted "Initial DC-DC voltage is about 88% of VMAX BOOST." from Section 7.3.1 ; change wording in last sentence before Equation 1 Go
- Changed Equation 1 and added "K" eq definitions; added new paragraph after Figure 7-1 Go
- Added new paragraph before Section 7.3.2 Go
- Deleted "Dimming ratio is calculated as ratio between the input PWM period and minimum on/off time (0.5 µs). " from Section 7.3.3.3 Go
Changes from Revision * (October 2015) to Revision A (September 2016)
- Changed several wording of several items in Features Go
- Changed "High Dimming Ratio of 10 000:1 at 200 Hz" to "High Dimming Ratio of 10 000:1 at 100 Hz"Go
- Added last sentence of first paragraph in Description sectionGo
- Changed "dimming ratio of 10 000:1 for 200-Hz" to "dimming ratio of 10 000:1 for 100-Hz"Go
- Added last sentence of Description sectionGo
- Added standard footnotes for the ESD Ratings table Go
- Added Figures 7 and 8 - new graphsGo
