L7820 ST 20V Positive Voltage Regulator Data Sheet

Download Datasheet for STMicroelectronics L7820T – 20V Positive Voltage Regulator [24 pages 1994 pdf]

SKU: L7820STDS1994 Category: Brand:

Description

L7820T 20V TO-3 Package Positive Voltage Regulator

– OUTPUT CURRENT UP TO 1.5A
– OUTPUT VOLTAGES OF 20V
– THERMAL OVERLOAD PROTECTION
– SHORT CIRCUIT PROTECTION
– OUTPUT TRANSISTOR SOA PROTECTION

The L7820 series of three-terminal positive regulator is available in TO-3 packages and with fixed output voltage making it useful in a wide range of applications.
These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible.
If adequate heat sinking is provided, theycan deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.

CONTENTS:
– BLOCK DIAGRAM
– ABSOLUTE MAXIMUM RATINGS
– THERMAL DATA
– L7820 CONNECTION DIAGRAM (PINOUT) AND ORDERING NUMBERS
– APPLICATION CIRCUIT
– SCHEMATIC DIAGRAM
– TEST CIRCUITS
Figure 1: DC Parameters
Figure 2: Load Regulation
Figure 3: Ripple Rejection
– ELECTRICAL CHARACTERISTICS
Figure 4: Dropout Voltage vs. Junction Temperature
Figure 5: Peak Output Current vs. Input/output Differential Voltage
Figure 6: Supply Voltage Rejection vs. Frequency
Figure 7: Output Voltage vs. Junction Temperature
Figure 8: Output Impedance vs. Frequency
Figure 9: Quiescent Current vs. Junction Temperature
Figure 10: Load Transient Response
Figure 11: Line Transient Response
Figure 12: Quiescent Current vs. Input Voltage
Figure 13: Fixed Output Regulator
Figure 14: Current Regulator
Figure 15: Circuit for Increasing Output Voltage
Figure 16: Adjustable Output Regulator
Figure 18: High Current Voltage Regulator.
Figure 19: High Output Current with Short Circuit Protection
Figure 20: Tracking Voltage Regulator
Figure 21: Split Power Supply
Figure 22: Negative Output Voltage Circuit
Figure 23: Switching Regulator
Figure 24: High Input Voltage Circuit
Figure 26: High Output Voltage Regulator
Figure 27: High Input and Output Voltage
Figure 28: Reducing Power Dissipation with Dropping Resistor
Figure 29: Remote Shutdown
Figure 30: Power AM Modulator (unity voltage gain, Io 3 1A).
Figure 31: Adjustable Output Voltage with Temperature Compensation
Figure 32: Light Controllers
Figure 33: Protection against Input Short-circuit with High Capacitance Loads
– MECHANICAL DATA