CLASS D AUDIO AMPLIFIER
250W PLATE AMPLIFIER
SDV1056-250: 250W RMS, CLASS D,
PLATE AMPLIFIER
FEATURES
• HIGH POWER: 250W RMS1
• INCLUDES REGUALTED +48+1V SUPPLY
• USES SWITCHING REGULATOR FOR
ENHANCED EFFICIENCY
• ELIMINATES THE EFFECT OF MAINS SUPPLY
VARIATIONS.
• SIMPLIFIES THE SELECTION AND TESTING OF
CLASS D AMPLIFIER MODULES.
• INCLUDES SHORT-CIRCUIT PROTECTION.
• INCLUDES TURN-ON/OFF CONTROL TO
PREVENT INADVERTENT AUDIO NOISES.
• INCLUDES SDV1025-250 AMPLIFIER MODULE
AND INTERFACE PCB.
• OTHER POWER OPTIONS AVAILABLE1
• CAN BE CUSTOMISED WITH CUSTOMER
LABELS
• LOW COST
• COMPACT
NOTES
1) Other power options include 600W (SDV1021-600-V).
Alternately, custom power levels can be produced.
APPLICATIONS
•
•
•
AUDIO POWER AMPLIFIER
ACTIVE SONAR SYSTEMS
POWER CONVERSION
DESCRIPTION
The SDV1056-250 is a complete 250Wrms audio
amplifier. The unit includes the mains transformer, switching
regulator unit and class D amplifier module. A voltage
selector switch allows operation on 230Vac and 115Vac.
Apart from the basic amplifier functions the product features
short-circuit and turn-on/off protection circuitry. The audio
input is via a ¼” jack (single ended) and the output is via a
Neutrik Speakon socket.
The unit is and excellent sampling block for the
250W range of class D products produced by Magnatec. In
addition to the standard product custom versions can be
produced subject to a minimum order quantity. For more
details of this product and our complete range of class D
solutions please contact Magnatec.
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for
the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by
implication or otherwise under any patent or patent right of Semelab Plc.
SPECIFICATIONS
Absolute maximum ratings
Input Voltage, Vac ……………………………………………………………………. 115/230 Vac
Control voltage SD ……………………………………………………………………… . +5.5 V
Operating free air temperature, TA …...…………………………………………… -10°C to 40°C
Storage temperature range, Tstg …………………………………………………….. -40°C to 70°C
PCB solder pad temperature for 30 secs ……..…………………………………………….. 260°C
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation
of the device at these or any other conditions beyond those indicated “recommended operating conditions” is not implied.
Recommended operating conditions
MIN
4.75
10
CONTROL VOLTAGE, SD
OPERATING FREE AIR TEMPERATURE, TA
TYP
5
MAX
5.25
40
UNIT
V
°C
Electrical characteristics at a free air temperature of 25°°C
PARAMETER
NOTES/TEST CONDITIONS
Po
OUTPUT POWER
4
PRR
ALLOWABLE POWER RAIL
RIPPLE
SD
SHUTDOWN VOLTAGE
LOAD amplifier just into clip
MIN
VALUE
VRS = 65 V
TYP
MAX
240
250
270
2
4
5
UNIT
W
%
15
V
MECHANICAL DETAILS
MECHANICAL DETAILS
Connections
Audio Input
TIP
BODY
Description
Input Signal
GND
Comment
¼” JACK plug required
¼” JACK plug required
Audio Output
1+
1-
OUTPUT 1+
OUTPUT 1-
Neutrik Speakon 4W Plug required
Neutrik Speakon 4W Plug required
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for
the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by
implication or otherwise under any patent or patent right of Semelab Plc.
GLOSSARY
Active speaker
Audio passband
Anti-clip
Class D
Decibel
EMC
ESR
Filter attenuation
Harmonic
(K)Hz
Inherent efficiency
Input impedance
Latency
Modulation Factor
Noise floor
Output impedance
PCB
PFC
p-p
PSU
PWM
Quiescent current
Rms
Slave module
SNR
Switching frequency
THD
Theoretical output power
Thermal resistance
Total coupled power
UPS
Integrated loudspeaker and amplifier.
Audio spectrum from 20Hz to 20KHz.
Circuit to correct for excessive input signals.
Amplifier using pulse width modulated output stage.
Measure of relative power dB = 10logP1/P2
Electro magnetic compatibility
Equivalent series resistance
Performance of a filter at a specific frequency or band of frequencies.
Higher multiple of a frequency
(Kilo) Hertz, frequency measure
Measure of the efficiency of the amplifier module alone.
Impedance looking into the amplifier.
Description of the dynamic range of music
Ratio of input signal amplitude to maximum permissible signal amplitude.
Residual noise level of the amplifier expressed in dB.
Source impedance seen looking into the amplifier output.
Printed circuit board
Power factor corrected
Peak to peak measurement
Power supply unit
Pulse width modulation
Current consumed by amplifier with no audio signal input.
Root mean square = Vp-p/(2√2)
Additional power output stage driven from an optional master unit.
Signal to noise ratio
Sample frequency of PWM.
Total harmonic distortion - measure of the accuracy with which an amplifier
replicates an input sine wave.
Maximum output power of amplifier module, alone assuming 100%
efficiency.
Measure of heatsink efficiency
Actual power coupled from amplifier to load (loudspeaker)
Uninterruptable power supply
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for
the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by
implication or otherwise under any patent or patent right of Semelab Plc.