Overview
The STP24DP05BTR, produced by STMicroelectronics, is a 24-bit constant current LED sink driver designed for LED panel displays. This monolithic, low-voltage, low-current power device features an 8 x 3-bit serial-IN, parallel-OUT shift register and 24 regulated current sources to drive LEDs with a constant current of 5-80 mA. It supports low-voltage power supply down to 3 V and is compatible with 3.3 V and 5 V microcontrollers. The device includes output error detection, gradual output delay, and high thermal efficiency packaging.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 3.0 | - | 5.5 | V |
| Output Voltage (VO) | -0.5 | - | 20 | V |
| Output Current (IO) | 5 | - | 80 | mA |
| Clock Frequency (fCLK) | - | - | 25 | MHz |
| Operating Temperature Range | -40 | - | 125 | °C |
| Storage Temperature Range | -40 | - | 150 | °C |
| Thermal Resistance Junction-Ambient (RthJA) | - | - | 33 | °C/W |
Key Features
- Low-Voltage Power Supply: Operates down to 3 V.
- Constant Current Output: 8 x 3 constant current output channels with adjustable output current through external resistors.
- Error Detection: Short and open output error detection.
- Serial Data Interface: Serial data IN/parallel data OUT with a clock frequency of up to 25 MHz.
- Gradual Output Delay: Prevents inrush current during output turn-ON.
- Thermal Efficiency: High thermal efficiency package with an exposed pad for improved heat dissipation.
- Output Status Flags: Open drain output flags (EFLAG, TFLAG) for error detection and overtemperature monitoring.
Applications
The STP24DP05BTR is primarily designed for LED panel displays, including but not limited to:
- LED signage and billboards.
- LED backlighting for LCD displays.
- LED lighting systems in automotive and industrial applications.
- Large format LED displays.
Q & A
- What is the operating voltage range of the STP24DP05BTR?
The operating voltage range is from 3.0 V to 5.5 V.
- What is the maximum output current per channel?
The maximum output current per channel is 80 mA.
- How does the error detection feature work?
The error detection feature checks for short to GND, short to VO, or open line conditions. It uses a dedicated pin or a logic sequence to enter detection mode and reports the status via the SDO pin.
- What is the purpose of the gradual output delay feature?
The gradual output delay feature prevents large inrush current and reduces the need for bypass capacitors by introducing a sequential delay in the output turn-ON.
- How is the output current adjusted?
The output current is adjusted through three external resistors, allowing for control over the light intensity of LEDs.
- What is the thermal resistance junction-ambient (RthJA) of the device?
The thermal resistance junction-ambient (RthJA) is 33 °C/W.
- What are the EFLAG and TFLAG pins used for?
The EFLAG and TFLAG pins are used to report error detection and overtemperature conditions, respectively.
- What is the maximum clock frequency supported by the device?
The maximum clock frequency supported is 25 MHz.
- What type of package does the STP24DP05BTR come in?
The device comes in a TQFP48-EP package.
- What are the storage temperature range and operating temperature range of the device?
The storage temperature range is -40 °C to 150 °C, and the operating temperature range is -40 °C to 125 °C.
