Overview
The L7915CT is a three-terminal negative voltage regulator produced by STMicroelectronics. It is part of the L79 series, which is designed to provide local on-card regulation, eliminating the distribution problems associated with single point regulation. This regulator is available in various packages, including TO-220, TO-220FP, and D²PAK, and offers several fixed output voltages. The L7915CT specifically provides a fixed output voltage of -15V, making it suitable for a wide range of applications, particularly in split power supplies.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25 °C | -14.4 | -15 | -15.6 | V |
| Output Voltage (VO) | IO = -5 mA to -1 A, PO ≤ 15 W, VI = -18.5 to -30 V | -14.3 | -15 | -15.7 | V |
| Line Regulation (ΔVO) | VI = -17.5 to -30 V, TJ = 25 °C | - | - | 300 mV | mV |
| Load Regulation (ΔVO) | IO = 5 mA to 1.5 A, TJ = 25 °C | - | - | 300 mV | mV |
| Quiescent Current (Id) | TJ = 25 °C | - | 3 | - | mA |
| Dropout Voltage (Vd) | IO = 1 A, TJ = 25 °C, ΔVO = 100 mV | - | - | 1.1 | V |
| Short Circuit Current (Isc) | TJ = 25 °C | - | - | 0.7 | A |
| Thermal Resistance Junction-Case (RthJC) | TO-220FP | - | - | 5 | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | TO-220FP | - | - | 60 | °C/W |
Key Features
- Output current up to 1.5 A
- Fixed output voltage of -15V
- Thermal overload protection
- Short-circuit protection
- Output SOA (Safe Operating Area) protection
- Output voltage tolerance of 4% at 25 °C (C version)
- Available in TO-220, TO-220FP, and D²PAK packages
- Can be used with external components to obtain adjustable voltages and currents
Applications
The L7915CT is particularly suited for applications requiring a stable negative voltage supply. It is commonly used in:
- Split power supplies (e.g., ±15V supplies)
- Local on-card regulation to eliminate distribution problems associated with single point regulation
- Various electronic devices requiring a stable negative voltage source
Q & A
- What is the output voltage of the L7915CT?
The output voltage of the L7915CT is -15V.
- What are the available packages for the L7915CT?
The L7915CT is available in TO-220, TO-220FP, and D²PAK packages.
- What is the maximum output current of the L7915CT?
The maximum output current of the L7915CT is up to 1.5 A.
- Does the L7915CT have thermal overload protection?
Yes, the L7915CT has thermal overload protection.
- How is the output voltage tolerance of the L7915CT?
The output voltage tolerance of the L7915CT is 4% at 25 °C (C version).
- Can the L7915CT be used for adjustable voltage regulation?
Yes, the L7915CT can be used with external components to obtain adjustable voltages and currents.
- What is the quiescent current of the L7915CT?
The quiescent current of the L7915CT is typically 3 mA at 25 °C.
- What is the dropout voltage of the L7915CT?
The dropout voltage of the L7915CT is typically 1.1 V at IO = 1 A and TJ = 25 °C.
- What is the short-circuit current of the L7915CT?
The short-circuit current of the L7915CT is typically 0.7 A at TJ = 25 °C.
- What are the thermal resistance values for the L7915CT in TO-220FP package?
The thermal resistance junction-case (RthJC) is 5 °C/W, and the thermal resistance junction-ambient (RthJA) is 60 °C/W for the TO-220FP package.
