Overview
The TPS92315DBVR is an off-line primary-side sensing controller designed by Texas Instruments for LED lighting applications. This controller eliminates the need for an opto-coupler by using primary-side regulation (PSR) to provide isolated output current regulation. It operates in discontinuous conduction mode with valley-switching to minimize switching losses and reduce EMI. The device is packaged in a SOT-23-6 format, making it compact and suitable for high-density designs.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Bias Supply Input Voltage (VCC) | 9 | - | 35 | V |
| Supply Current, Run (IGATE = 0) | 2.1 | 3.0 | - | mA |
| Supply Current, Start (VVCC = 18V, IGATE = 0) | 1.0 | 3.0 | - | µA |
| Supply Current, Fault (IGATE = 0) | 2.1 | 2.8 | - | mA |
| VCC Turn-On Threshold | 18 | 21 | 24 | V |
| VCC Turn-Off Threshold | 7.70 | 8.10 | 8.45 | V |
| Maximum Switching Frequency | 120 | 130 | 140 | kHz |
| Minimum Switching Frequency | 875 | 1000 | 1100 | Hz |
| Internal Junction Temperature (TJ) | -20 | - | 125 | °C |
| Thermal Shut-Down Temperature (TJ(stop)) | - | - | 165 | °C |
Key Features
- Primary-Side Regulation (PSR): Eliminates the need for an opto-coupler, providing isolated output current regulation without optical feedback.
- Valley-Switching Operation: Reduces switching losses and EMI by switching at the valley of the drain-source voltage.
- Frequency and Primary Peak Current Modulation: Combines frequency and primary peak current modulation to achieve high conversion efficiency across the load range.
- Low Start-Up Current: Enables high power density and low quiescent power without sacrificing start-up time.
- Comprehensive Fault Protection: Includes output over-voltage, input under-voltage, internal over-temperature, primary over-current, and ISNS/VSNS pin faults.
- Patent-Pending Frequency Jitter Scheme: Reduces EMI peak energy of the fundamental switching frequency and harmonics.
- Low Component Count: Simplifies the design process and reduces overall system cost.
Applications
The TPS92315DBVR is primarily designed for LED lighting applications, including:
- LED drivers for general lighting.
- SSL (Solid-State Lighting) drivers.
- High-efficiency AC-DC power supplies.
- Low-power offline switch-mode power supplies.
Q & A
- What is the primary function of the TPS92315DBVR?
The TPS92315DBVR is an off-line primary-side sensing controller designed to provide accurate voltage and constant current regulation in LED lighting applications without the need for an opto-coupler.
- What is the operating voltage range for the VCC pin?
The VCC pin operates within a voltage range of 9V to 35V.
- What is the maximum switching frequency of the TPS92315DBVR?
The maximum switching frequency is 130 kHz.
- What type of switching operation does the TPS92315DBVR use?
The device uses valley-switching operation to reduce switching losses and EMI.
- What kind of fault protections are included in the TPS92315DBVR?
The device includes comprehensive fault protections such as output over-voltage, input under-voltage, internal over-temperature, primary over-current, and ISNS/VSNS pin faults.
- How does the TPS92315DBVR reduce EMI?
The device reduces EMI through a patent-pending frequency jitter scheme and by modulating the control frequency and current sense thresholds.
- What is the thermal shut-down temperature of the TPS92315DBVR?
The internal junction temperature shut-down threshold is 165°C.
- What package type is the TPS92315DBVR available in?
The device is available in a SOT-23-6 package.
- What are the typical applications of the TPS92315DBVR?
The device is typically used in LED drivers for general lighting, SSL drivers, high-efficiency AC-DC power supplies, and low-power offline switch-mode power supplies.
- How does the TPS92315DBVR manage start-up and shut-down?
The device manages start-up and shut-down through a start-up resistor connected to VCC and a wide separation of run and stop thresholds determined by current information at the VSNS pin.
