Overview
The LED6000PHTR from STMicroelectronics is a step-down monolithic switching regulator designed to source up to 3 A DC current, making it ideal for high power LED driving applications. This device features a voltage mode, constant frequency control loop and includes various functionalities such as adjustable switching frequency, digital dimming, and synchronization capabilities. The LED6000PHTR is packaged in a 16-pin HTSSOP exposed pad package, enhancing thermal performance and efficiency.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Input Voltage (VIN) | 4.5 | - | 61 | V |
| Output Current (IOUT) | - | 3 | - | A |
| High-Side RDSON (RDS,ON) | 0.25 | 0.32 | 0.42 | Ω |
| Switching Frequency (fSW) | 225 | 250 | 275 | kHz |
| Peak Current Limit (IPK) | 3.5 | 4.1 | 4.7 | A |
| Output Current Accuracy | - | ±3% | - | % |
| Shutdown Current (ISHTDWN) | 10 | 15 | - | μA |
| Quiescent Current (IQUIESC) | 2.4 | 3.4 | - | mA |
| Thermal Shutdown Temperature (TSHDWN) | - | 170 | - | °C |
Key Features
- Adjustable Switching Frequency: The switching frequency can be adjusted from 250 kHz to 1.5 MHz using an external resistor connected to the FSW pin.
- Digital Dimming: Implemented through a dedicated DIM pin, allowing for PWM current dimming.
- Synchronization: Multiple devices can be synchronized using the SYNCH pin to prevent beating noise and reduce input current RMS value.
- Soft-Start and Current Limitation: Adjustable soft-start time and peak current limitation to manage inrush current and overload conditions.
- Thermal Protection: Auto recovery thermal shutdown and overcurrent protection to ensure device reliability.
- Efficiency Enhancement: VBIAS pin to improve efficiency at light-load conditions by switchover function from VCC to VBIAS).
- Low Dropout Operation: Maximum 12 µs low dropout operation to maintain efficiency during transient conditions).
Applications
- High Brightness (HB) LED Driving: Ideal for driving high power LEDs in various lighting applications).
- Halogen Bulb Replacement: Suitable for applications where halogen bulbs are being replaced with LED solutions).
Q & A
- What is the maximum output current of the LED6000PHTR?
The LED6000PHTR can source up to 3 A DC current).
- What is the operating input voltage range of the LED6000PHTR?
The operating input voltage range is from 4.5 V to 61 V).
- How can the switching frequency be adjusted?
The switching frequency can be adjusted by connecting an external resistor to the FSW pin, allowing frequencies from 250 kHz to 1.5 MHz).
- Does the LED6000PHTR support digital dimming?
Yes, digital dimming is supported through a dedicated DIM pin using PWM signals).
- What is the purpose of the VBIAS pin?
The VBIAS pin can be used to supply a part of the analog circuitry to increase efficiency at light-load conditions by switchover from VCC to VBIAS).
- How does the LED6000PHTR protect against overheating?
The device features auto recovery thermal shutdown and overtemperature protection to prevent thermal runaway).
- Can multiple LED6000PHTR devices be synchronized?
Yes, multiple devices can be synchronized using the SYNCH pin to prevent beating noise and reduce input current RMS value).
- What is the quiescent current of the LED6000PHTR in shutdown mode?
The shutdown current from VIN is typically 10 µA to 15 µA).
- What is the thermal resistance junction to ambient for the LED6000PHTR?
The thermal resistance junction to ambient (RthJA) is 40 °C/W when the device is soldered on the STMicroelectronics demonstration board).
- What package type is the LED6000PHTR available in?
The LED6000PHTR is available in a 16-pin HTSSOP exposed pad package).
