Overview
The STCS1PHR, produced by STMicroelectronics, is a BiCMOS constant current source designed to provide a precise constant current from a varying input voltage source. This component is aimed at replacing discrete component solutions for driving LEDs in low voltage applications, such as 5 V, 12 V, or 24 V, offering benefits in terms of precision, integration, and reliability.
The STCS1PHR is particularly useful in industrial and low voltage lighting applications, including small appliance LED lighting. It features a shutdown pin, PWM dimming capability, and an open-drain pin for load disconnection diagnostics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 40 | V |
| Output Current Range | 1 to 1500 | mA |
| Voltage Overhead | < 0.5 | V |
| Feedback Voltage | 90 to 110 | mV |
| Quiescent Current (On Mode) | 450 to 750 | µA |
| Quiescent Current (Shutdown Mode) | 1 to 3 | µA |
| Dropout Voltage (VDRAIN to GND) | 0.12 to 0.9 | V |
| Junction Temperature Range | -40 to 150 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Package Type | PowerSO-8 | |
| RoHS Compliance Grade | Ecopack2 |
Key Features
- Up to 40 V input voltage and up to 1.5 A output current
- Less than 0.5 V voltage overhead
- PWM dimming pin for adjustable brightness control
- Shutdown pin for power management
- LED disconnection diagnostic with open-drain output
- High precision current setting with external resistor (± 10% precision)
- Thermal shutdown protection
Applications
- Supplying LEDs with constant current for varying input voltages
- Low voltage lighting applications
- Small appliance LED lighting
- Industrial lighting solutions
Q & A
- What is the input voltage range of the STCS1PHR?
The input voltage range of the STCS1PHR is from 4.5 V to 40 V.
- What is the maximum output current of the STCS1PHR?
The maximum output current of the STCS1PHR is up to 1.5 A.
- How is the current set in the STCS1PHR?
The current is set with an external sensing resistor connected to the FB pin, with a feedback voltage of 100 mV.
- Does the STCS1PHR support PWM dimming?
Yes, the STCS1PHR has a dedicated PWM dimming pin for adjustable brightness control.
- What is the purpose of the shutdown pin on the STCS1PHR?
The shutdown pin allows for power management by enabling or disabling the device.
- How does the STCS1PHR detect LED disconnection?
The STCS1PHR detects LED disconnection through an open-drain output pin that provides information on load disconnection conditions.
- What is the thermal shutdown temperature of the STCS1PHR?
The thermal shutdown temperature of the STCS1PHR is 155 °C with a hysteresis of 25 °C.
- What package types are available for the STCS1PHR?
The STCS1PHR is available in PowerSO-8 and DFN8 (3x3 mm) packages.
- Is the STCS1PHR RoHS compliant?
Yes, the STCS1PHR is RoHS compliant with an Ecopack2 grade.
- What is the storage temperature range for the STCS1PHR?
The storage temperature range for the STCS1PHR is from -55 °C to 150 °C.
