Application Notes

12V Power Supplies

12V power supplies (or 12VDC power supplies) are one of the most common power supplies in use today. In general, a 12VDC output is obtained from a 120VAC or 240VAC input using a combination of transformers, diodes and transistors. 12V power supplies can be of two types: 12V regulated power supplies, and 12V unregulated power supplies.12V regulated power supplies come in three styles: Switching regulated AC to DC, Linear regulated AC to DC, and Switching regulated DC to DC.

Switching regulated 12VDC power supplies, sometimes referred to as SMPS power supplies, switchers, or switched mode power supplies, regulate the 12VDC output voltage using a complex high frequency switching technique that employs pulse width modulation and feedback. Acopian switching regulated power supplies also employ extensive EMI filtering and shielding to attenuate both common and differential mode noise conducted to the line and load. Galvanic isolation is standard in our 12VDC switchers, affording our users input to output and output to ground isolation for maximum versatility. Acopian switching regulated power supplies are highly efficient, small and lightweight, and are available in both AC-DC single and wide-adjust output and DC-DC configurations. Our Low Profile wide adjust output switchers can be voltage or current regulated and are externally programmable.

Linear regulated 12VDC power supplies regulate the output using a dissipative regulating circuit. They are extremely stable, have very low ripple, and have no switching frequencies to produce EMI. Galvanic isolation is standard in our 12VDC linears, affording our users input to output and output to ground isolation for maximum versatility. Acopian linear regulated power supplies are available AC to DC single and wide adjust outputs.

Unregulated 12VDC power supplies are basic power supplies with an AC input and an unregulated 12VDC output. The output voltage changes with the input voltage and load. These power supplies are inexpensive and extremely reliable.

Typical applications for 12 VDC power supplies:

• Computer Peripherals and Networking Applications
• Telecommunications and Fiber optic Network
• Voice, Data and Analog Communications
• Universities and Educational Facilities
• Instrumentation and Electronics
• Utility and Power Industries
• Data Acquisition
• Medical
• Military
• Motor control

Mini Encapsulated 12VDC Switchers (PC board mount):

• 12WL250 12VDC @ 2.5A
• 12WL410 12VDC @ 4.1A

• Internal EMI filter and RFI shielding
• Short circuit and overload protected
• Screw terminals or PC mounting

Mini Encapsulated 12VDC Switchers (screw terminal):

• 12WB250 12VDC @ 2.5A
• 12WB410 12VDC @ 4.1A

• Internal EMI filter and RFI shielding
• Short circuit and overload protected
• Screw terminals or PC mounting

Mini Encapsulated 12VDC Linears (PC board mount):

• 12E10 12VDC @ 0.1A
• 12E15 12VDC @ 0.15A
• 12E20A 12VDC @ 0.2A
• 12E40 12VDC @ 0.4A
• 12E70 12VDC @ 0.7A
• 12E120 12VDC @ 1.2A
• D12-03 ±12VDC @ 0.025A
• D12-05 ±12VDC @ 0.05A
• D12-10A ±12VDC @ 0.1A
• D12-15A ±12VDC @ 0.15A
• D12-20 ±12VDC @ 0.2A
• D12-30 ±12VDC @ 0.3A
• D12-35 ±12VDC @ 0.35A
• D12-50 ±12VDC @ 0.5A

• Short circuit and overload protected

Mini Encapsulated 12VDC Linears (PC board mount):

• 12EB20 12VDC @ 0.2A
• 12EB40 12VDC @ 0.4A
• 12EB70 12VDC @ 0.7A
• 12EB120 12VDC @ 1.2A
• DB12-10 ±12VDC @ 0.1A
• DB12-15 ±12VDC @ 0.15A
• DB12-20 ±12VDC @ 0.2A
• DB12-30 ±12VDC @ 0.3A
• DB12-35 ±12VDC @ 0.35A
• DB12-50 ±12VDC @ 0.5A

• Short circuit and overload protected

Linear Regulated Redundant 12VDC Power Packages (rack mounting)

• R12N8X 12VDC @ 1.5A
• R12M6 12VDC @ 3.5A
• R12M13 12VDC @ 8A
• R12H11 12VDC @ 16A
• R12H16 12VDC @ 20A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection
• Complete with voltmeters and dual AC inputs

Linear Regulated Redundant 12VDC Power Packages (wall mounting)

• RWL12N8X 12VDC @ 1.5A
• RWL12M6 12VDC @ 3.5A
• RWL12M13 12VDC @ 8A
• RWL12H11 12VDC @ 16A
• RWL12H16 12VDC @ 20A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection
• Complete with voltmeters and dual AC inputs

Parallelable “Semisystem” Linear Regulated 12VDC Power Supplies

• R12PH17 12VDC @ 41A

• Parallelable to create a redundant power package
• Overvoltage, overload, and short circuit protection
• Voltmeter and Jones connector standard

Switching Regulated 12VDC Redundant Power Packages (rack mounting)

• R12W6 12VDC @ 26A
• R12W9 12VDC @ 41A
• R12G7 12VDC @ 61A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection
• Complete with voltmeters and dual AC inputs

Switching Regulated 12VDC Redundant Power Packages (wall mounting)

• RWL12W6 12VDC @ 26A
• RWL12W9 12VDC @ 41A
• RWL12G7 12VDC @ 61A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection
• Complete with voltmeters and dual AC inputs

Switching Regulated 12VDC Pluggable Redundant Power Packages

• R12WP8X 12VDC @ 12.3A
• R12WP8 12VDC @ 20A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection
• Complete with voltmeters and dual AC inputs

Linear Regulated 12VDC Modular Redundant Systems

• RM12N8X 12VDC @ 1.5A
• RM12M6 12VDC@ 3.5A
• RM12M13 12VDC @ 8A
• RM12H11 12VDC @ 16A
• RM12H16 12VDC @ 20A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection

Switching Regulated 12VDC Modular Redundant Systems

• RM12WN8A 12VDC @ 12.3A
• RM12WN8 12VDC@ 20A

• Hot-swappable power supplies
• Overvoltage, overload, and short circuit protection
• Power factor correction
• Universal AC input

Rack Mounting 12VDC Linear Regulated Power Supplies

• 12PT17 12VDC @ 17A
• 12PH22 12VDC @ 22A
• 12PT33 12VDC @ 33A
• 12PH45 12VDC @ 45A

• Overload, and short circuit protection
• Overvoltage protection available

Narrow Profile 12VDC linear Regulated Power Supplies

• B12TN100 12VDC @ 1A
• A12TN110 12VDC @ 1.1A
• A12NT200 12VDC @ 2A

• Short circuit and overload protected
• Overvoltage protection available

Narrow Profile 12VDC switching Regulated Power Supplies (to 120W)

• W12FT580 12VDC @ 5.8A
• W12FT910 12VDC @ 9.1A

• Short circuit and overload protected
• Overvoltage protection
• Pluggable input/output terminal block
• Internal EMI filter and RFI shielding

Narrow Profile 12VDC switching Regulated Power Supplies (to 288W)

• W12NT1370 12VDC @ 13.7A
• W12NT2200 12VDC @ 22A

• Universal input
• Short circuit and overload protected
• Overvoltage protection
• Pluggable input/output terminal block
• Internal EMI filter and RFI shielding

Low profile 12VDC switching Regulated Power Supplies

• W12LT3750 12VDC @ 37.5A
• W12LT6000 12VDC @ 60A
• Y012LX3700 0-12VDC @ 0-37.5A
• Y012LX6000 0-12VDC @ 0-6000A

• Short circuit and overload protected
• Overvoltage protection
• Pluggable input/output terminal block
• Universal input (90-265VAC, 49-420HZ, 110-350VDC)
• Power factor correction (PFC)
• Constant current and constant voltage modes (wide adjust output models)
• Programmable (Vout, Iout, Vmon, Imon, Vok, enable) (wide adjust output models)
• Analog (0-10VDC)
• Ethernet
• RS232
• USB
• Parallelable (fixed voltage models) — up to 2880 Watts
• Internal EMI filter and RFI shielding
• Soft start

Gold Box 12VDC Linear Regulated Power Supplies

• B12G50 12VDC @ 0.5A
• B12G100 12VDC @ 1A
• B12G200 12VDC @ 2A
• B12G300 12VDC @ 3A
• B12G380 12VDC @ 3.8A
• A12MT400 12VDC @ 4A
• B12G650 12VDC @ 6.5A
• A12MT650 12VDC @ 6.5A
• B12G900 12VDC @ 9A
• A12MT900 12VDC @ 9A
• A12H1300 12VDC @ 13A
• A12H1700 12VDC @ 17A
• A12H2100 12VDC @ 21A

• Short circuit and overload protected
• Low ripple
• High performance regulation

Gold Box 12VDC switching Regulated Power Supplies

• W12MT29 12VDC @ 29A
• W12MT45 12VDC @ 45A
• W12GT68 12VDC @ 68A
• W12GT95 12VDC @ 95A

• Short circuit and overload protected
• Overvoltage protection
• Internal EMI filter and RFI shielding
• Soft start

Gold Box 12VDC Unregulated Power Supplies

• U12Y150 12VDC @ 1.5A
• U12Y500 12VDC @ 5A
• U12Y1000 12VDC @ 10A

• Low cost DC power
• Built-in fusing

Gold Box and Narrow Profile Dual Tracking Output 12VDC Linear Regulated Power Supplies

• TD12-100 ±12VDC @ 1A
• TD12-160 ±12VDC@ 1.6A
• TD12-250 ±12VDC @ 2.5A
• TD12-450 ±12VDC @ 4.5A
• TD12-850 ±12VDC @ 8.5A
• FD12-50A ±12VDC @ 0.5A
• LD12-100 ±12VDC @ 1A

• Short circuit and overload protected
• Tracking within 1%

Gold Box Dual Isolated Output 12VDC Linear Regulated Power Supplies

• 12GT25D 12VDC @ 0.25A
• 12GT50D 12VDC @ 0.5A
• 12GT70D 12VDC @ 0.7A
• 12GT100D 12VDC @ 1.0A

• The above power sections are combined with another section for a complete dual output power supply
• Short circuit and overload protection
• Built-in fuse

Gold Box Dual Isolated Output (5V/12V combinations) Linear Regulated Power Supplies

• 512D5A 5VDC @ 2A; 12VDC @ 0.6A
• 512D6A 5VDC @ 3A; 12VDC @ 1.2A
• 512D9A 5VDC @ 6A; 12VDC @ 2.4A

• Short circuit and overload protection
• Each output is independently adjustable

Gold Box Triple Isolated Outputs Linear Regulated Power Supplies

• 5512T6A 5VDC @ 3A; 5VDC @ 1A; 12VDC @ 0.6A
• 5512T9A 5VDC @ 6A; 5VDC @ 2A; 12VDC @ 1.2A
• 5912T9A 5VDC @ 6A; 9VDC @ 1.4A; 12VDC @ 1.2A
• 51212T5A 5VDC @ 2A; 12VDC @ 0.3A; 12VDC @ 0.3A
• 51212T6A 5VDC @ 3A; 12VDC @ 0.6A; 12VDC @ 0.6A
• 51212T9A 5VDC @ 6A; 12VDC @ 1.2A; 12VDC @ 1.2A
• 51212T13A 5VDC @ 8A; 12VDC @ 1.3A; 12VDC @ 1.3A
• 51212T11A 5VDC @ 15A; 12VDC @ 2A; 12VDC @ 2A
• 51212T16A 5VDC @ 20A; 12VDC @ 3A; 12VDC @ 3A

• Short circuit and overload protection
• Each output is independently adjustable

Mini encapsulated DC-DC converters

• 7 - 14 Watts
• 12VDC outputs at input voltages ranging from 5-48VDC, ±10%
• Screw terminals or PC mounting
• Single output or dual tracking

Narrow profile DC-DC converters

• 54 - 288Watts
• 12VDC outputs at input voltages from 18-350VDC.
• Short circuit and overload protected
• Overvoltage protection
• Pluggable input/output terminal block
• Internal EMI filter and RFI shielding

Gold Box Infinity 12VDC Linear Regulated Power Supplies

• L12MC450 12VDC @ 4.5A
• L12MC720 12VDC @ 7.2A
• YL012MC250 0-12VDC @ 2.5A
• YL012MC350 0-12VDC @ 3.5A
• YL012MC680 0-12VDC @ 6.8A

• Short circuit and overload protection
• Enhanced surge capabilities
• Open sense protection
• Internal EMI filtering
• Pluggable connectors

1U 12VDC Switching Regulated Rack Mount Power Supply

• W12LTU3750 12VDC @ 37.5A
• W12LTU6000 12VDC @ 60A
• Y012LXU3700 0-12VDC @ 37.5A
• Y012LXU6000 0-12VDC @ 60A

• Short circuit and overload protected
• Overvoltage protection
• Pluggable input/output terminal block
• Universal input (90-265VAC, 49-420HZ, 110-350VDC)
• Power factor correction (PFC)
• Constant current and constant voltage modes (wide adjust output models)
• Programmable (Vout, Iout, Vmon, Imon, Vok, enable) (wide adjust output models)
• Analog (0-10VDC)
• Ethernet
• RS232
• USB
• Parallelable (fixed voltage models) — up to 2880 Watts
• Internal EMI filter and RFI shielding
• Soft start

1U 12VDC Switching Regulated Bench Top Power Supply

• W12LTB3750 12VDC @ 37.5A
• W12LTB6000 12VDC @ 60A
• Y012LXB3700 0-12VDC @ 37.5A
• Y012LXB6000 0-12VDC @ 60A

• Short circuit and overload protected
• Overvoltage protection
• Pluggable input/output terminal block
• Universal input (90-265VAC, 49-420HZ, 110-350VDC)
• Power factor correction (PFC)
• Constant current and constant voltage modes (wide adjust output models)
• Programmable (Vout, Iout, Vmon, Imon, Vok, enable) (wide adjust output models)
• Analog (0-10VDC)
• Ethernet
• RS232
• USB
• Parallelable (fixed voltage models) — up to 2880 Watts
• Internal EMI filter and RFI shielding
• Soft start