Overview
The LED2001PHR from STMicroelectronics is a monolithic step-down DC-DC converter designed to operate as a precise constant current source. It features an 850 kHz fixed switching frequency and is capable of delivering up to 4 A of DC current. The device is optimized for high brightness LED driving and includes embedded synchronous rectification, PWM dimming, and internal current limiting. It is available in VFQFPN 4x4 mm 8-lead and HSOP8 packages, making it suitable for a variety of lighting applications where compact size and high efficiency are crucial.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Input Voltage Range | 3 to 18 | V |
| Switching Frequency | 850 kHz | |
| Current Sense Voltage Drop | 100 mV (typ.) | |
| Output Current Accuracy | ± 7% | |
| High-Side Switch On-Resistance | 95 mΩ (typ.) | |
| Low-Side Switch On-Resistance | 69 mΩ (typ.) | |
| Maximum Limiting Current | 5.6 A | |
| Thermal Shutdown Temperature | 150 °C (typ.) | |
| Operating Junction Temperature Range | -40 to 150 °C | |
| Package Types | VFQFPN 4x4 mm 8-lead, HSOP8 |
Key Features
- Synchronous Rectification: Enhances efficiency performance.
- PWM Dimming: Allows for LED brightness control through a dedicated dimming input.
- Internal Current Limiting: Protects against overcurrent conditions.
- Thermal Shutdown: Prevents thermal overheating with a hysteresis of 15 °C.
- Soft-Start: Minimizes inrush current and stress on power components during power-up.
- Embedded Compensation Network: Stabilizes the system in most application conditions.
- Ceramic Output Capacitor Compliant: Reduces the overall application size.
Applications
- High Brightness LED Driving: Ideal for applications requiring precise constant current.
- Signage: Suitable for digital signage and display lighting.
- Halogen Bulb Replacement: Can be used in applications where halogen bulbs are being replaced with LEDs.
- General Lighting: Applicable in various general lighting solutions where high efficiency and compact design are necessary.
Q & A
- What is the operating input voltage range of the LED2001PHR?
The operating input voltage range is from 3 V to 18 V.
- What is the switching frequency of the LED2001PHR?
The switching frequency is fixed at 850 kHz.
- How does the PWM dimming feature work on the LED2001PHR?
The PWM dimming feature allows for LED brightness control through a dedicated dimming input. A square wave on this pin implements LED current PWM dimming.
- What is the maximum limiting current of the LED2001PHR?
The maximum limiting current is 5.6 A.
- What are the package types available for the LED2001PHR?
The device is available in VFQFPN 4x4 mm 8-lead and HSOP8 packages.
- How does the thermal shutdown protection work?
The thermal shutdown protection disables the power stage if the temperature exceeds 150 °C, with a hysteresis of 15 °C to prevent continuous on/off cycling.
- What is the purpose of the soft-start feature?
The soft-start feature minimizes the inrush current and reduces stress on power components during power-up by ramping the reference of the embedded error amplifier over a typical time of 1 ms.
- Is the LED2001PHR compatible with ceramic output capacitors?
Yes, the device is ceramic output capacitor compliant, which helps in minimizing the overall application size.
- How does the embedded compensation network contribute to the system stability?
The embedded compensation network stabilizes the system in most application conditions by introducing a pole and a zero in the open loop gain, ensuring good phase margin and bandwidth.
- What is the role of the eDesignSuite software in relation to the LED2001PHR?
The eDesignSuite software supports component sizing according to the technical information provided in the datasheet, helping users to easily design and optimize their applications.
