Overview
The TPS61165-Q1, produced by Texas Instruments, is a high-efficiency boost converter designed to drive high-brightness white LEDs in series. This device is particularly suited for applications requiring high output voltage and current stability. It operates at a fixed 1.2-MHz switching frequency with a 1.2-A switch current limit, making it ideal for general lighting, automotive cluster backlighting, and white LED backlighting for media form factor displays. The device is packaged in a compact SOT-23 package, enhancing its suitability for space-constrained designs.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range (VIN) | 3 | 18 | 18 | V |
| Output Voltage Range (VO) | VIN | - | 38 | V |
| Switching Frequency | - | 1.2 | - | MHz |
| Switch Current Limit | - | 1.2 | - | A |
| Open LED Protection Threshold (SW Pin) | 37 | 38 | 39 | V |
| Reference Voltage (VREF) | - | 200 mV | - | mV |
| Operating Ambient Temperature (TA) | -40 | - | 105 | °C |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °C |
| Junction-to-Ambient Thermal Resistance (θJA) | - | 210.1 | - | °C/W |
Key Features
- High Efficiency: Up to 90% efficiency, ensuring minimal heat generation and optimal performance.
- Flexible Dimming Control: Supports both 1-wire digital dimming using the EasyScale™ protocol and pulse width modulation (PWM) dimming through the CTRL pin.
- Open LED Protection: Integrated protection circuitry that disables the device if an LED is disconnected, preventing damage.
- Soft Start: Built-in soft start feature to prevent inrush current and ensure smooth startup.
- Thermal Shutdown: Automatically shuts down the device if the junction temperature exceeds 160°C, restarting when the temperature drops by 15°C.
- Compact Package: Available in a small SOT-23 package, ideal for space-constrained applications.
Applications
- General Lighting: Suitable for driving high-brightness LEDs in various lighting applications.
- Automotive Cluster Backlighting: Ideal for backlighting automotive cluster displays due to its high efficiency and reliability.
- White LED Backlighting for Media Form Factor Displays: Used in backlighting for displays in media form factor devices.
Q & A
- What is the maximum input voltage for the TPS61165-Q1?
The maximum input voltage for the TPS61165-Q1 is 18 V.
- What is the switching frequency of the TPS61165-Q1?
The switching frequency is fixed at 1.2 MHz.
- How is the LED current controlled in the TPS61165-Q1?
The LED current can be controlled using either the 1-wire digital interface (EasyScale™ protocol) or pulse width modulation (PWM) through the CTRL pin.
- What is the purpose of the open LED protection feature?
The open LED protection feature disables the device if an LED is disconnected, preventing damage to the IC.
- What is the thermal shutdown temperature for the TPS61165-Q1?
The device shuts down if the junction temperature exceeds 160°C and restarts when the temperature drops by 15°C.
- What package type is the TPS61165-Q1 available in?
The TPS61165-Q1 is available in a SOT-23 package.
- How does the soft start feature work in the TPS61165-Q1?
The built-in soft start feature prevents inrush current and ensures a smooth startup by gradually increasing the output voltage.
- What is the efficiency of the TPS61165-Q1?
The TPS61165-Q1 has an efficiency of up to 90%.
- How is the dimming mode selected in the TPS61165-Q1?
The dimming mode is selected each time the device is enabled. The default mode is PWM dimming, and 1-wire mode can be entered by following a specific digital pattern on the CTRL pin.
- What happens during shutdown mode in the TPS61165-Q1?
During shutdown, the input supply current is less than 1 μA, and the internal FET does not switch, although there is still a DC current path between the input and the LEDs.
