The Motorola TPN1154A is a desktop power supply engineered for Motorola radio base station equipment. This unit delivers fixed 15 VDC output with adjustable voltage capability and handles continuous currents to 14 A, making it suitable for powering RF transceivers and associated station infrastructure. The supply shares electrical and physical design with the Motorola HPN3000A, featuring robust construction and terminal strip DC output connectors.
Technical Specifications
• Output Voltage: Fixed nominally just below 15 VDC; adjustable to approximately 13.9 VDC with 5.6 kΩ resistor modification across R7
• Continuous Output Current: 14 A maximum
• Peak Output Current: 20 A (limited by AC mains fuse)
• Load Current Limit: 16.7 A maximum (emitter ballast resistor rating)
• AC Input: 110–220 VAC
• Mains Fuse: 5 A fast blow
• Output Pass Transistors: Paralleled configuration with 7 W emitter ballast resistors per device
• DC Output Interface: Terminal strip with numbered lugs; lugs 1, 3, 5, 6, 8 carry DC output; lugs 2, 7 ground-mounted; lug 4 unused
– Key Features
• Fixed voltage output with optional adjustment capability via external resistor modification
• Dual AC input voltage range (110–220 VAC) accommodates international supply standards
• Output pass transistor design with current equalization ballast resistors
• Electrically identical to HPN3000A platform
• Original design exhibits load and line voltage dependent regulation; improved regulation achievable through LM7812 regulator retrofit
– Typical Applications
• Motorola base station power supply (Maxar-80 compatibility confirmed)
• 15 VDC mobile and fixed-station RF equipment
• Systems requiring 14 A continuous or 20 A peak current capability
– Compatibility & Integration
Electrically and physically identical to the Motorola HPN3000A. Shares transformer, rectifier bridge, filter capacitor, and regulator board architecture. Related to the TPN1136A 8 A variant within the same product family.
