RDL FP-PA35A Datasheet

FLAT-PAK™ SERIES

Model FP-PA35A

35 W Audio Power Amplifier
with Power Supply

 35 Watts RMS Constant Voltage Amplifier
 25 V, 70 V or 100 V Output
 Plenum Rated per UL 2043 Standard
 Automatic Energy-Saving Sleep Mode
 Selectable Sleep Delay: Off, 5, 15, 25 Minutes
 Input / Output Terminal Block Connections
 Line Level Balanced or Unbalanced Input
 Compressor/Limiter Controls Clipping
 LED to Indicate Audio Compression Threshold
 Compressor Produces Maximized Average Output Power
 Audio Quality Superior to Standard Amplifiers
 Ultra-compact All Metal Construction
 High-Efficiency Class D Operation
 Thermal and Short-Circuit Protection

The FP-PA35A is part of the group of versatile FLAT-PAK products from Radio Design Labs. The unique FLAT-PAK case can be directly screwed
or bolted to cabinets or shelves. Optionally available rack-mounting accessories permit single or multiple FLAT-PAK module mounting.

APPLICATION:

zone need to be powered from a single audio power amplifier.

The FP-PA35A features a balanced line level input that may be connected unbalanced. A front panel gain control is
designed to be adjusted manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced
levels as well as professional balanced levels. Multiple distributed sound system speakers connect to the corresponding
25 V, 70 V or 100 V amplified output.

The FP-PA35A includes an analog compressor/limiter for audio fidelity audibly superior to conventional class D amplifiers
with digital limiting. The input GAIN setting determines whether the limiter alone is used for clipping suppression, or if the
full compressor/limiter will be used to substantially increase the average output power beyond that of a standard 35 W
amplifier. A red COMPRESSION LED flashes when the limiter is preventing output clipping. Normal audio level signals
remain unaffected by the compressor thereby preserving audio dynamics. If the input level is increased so that the
compressor is active, the LED remains dimly lit between peak flashes. The audio is compressed according to three
dynamic time constants providing aural transparency while maintaining clean, unclipped amplified audio for input overloads
of up to 20 dB. The FP-PA35A, with compression, is capable of producing average audio output levels and clarity normally
expected from amplifiers with a much higher output power rating.

The FP-PA35A circuits are all designed for low power consumption. In the absence of an audio input, a digital timer is
enabled to switch the class D output stage off. When this sleep mode is active, the amplifier module and its included RDL
power supply consume less than 1 W of mains power. A front-panel control sets the sleep mode delay timer to 5, 15 or 25
minutes. The control also permits the installer to bypass the sleep mode to conform to system specifications that require
the amplifier to be active at all times. Upon detection of an input signal, the amplifier is nearly inaudibly and instantly
restored to full operation within 150 milliseconds.

A blue POWER LED illuminates when the FP-PA35A is powered from its external 24 Vdc power supply. The power LED is
dimly illuminated when the sleep mode disables the amplifier and glows brightly when the amplifier operation is fully
enabled. The module is equipped with both thermal and output short-circuit protection. The high-efficiency Class D output
stage produces minimal heat for all levels of expected voice or music modulation. Continuous full-power operation with
audio tones will not damage the amplifier, but is not recommended.

Wherever an ultra-compact, high quality, high efficiency eco-friendly audio power amplifier is needed to provide reliability
and unsurpassed versatility, the FP-PA35A is the ideal choice. Use the FP-PA35A individually, or combine it with other
RDL products as part of a complete audio/video system.

The FP-PA35A is the ideal choice in many applications where multiple 25 V, 70 V or 100 V speakers in a

RDL  659 6th St.  Prescott, AZ., USA 86301  [phone]  FAX [phone]  www.rdlnet.com

FLAT-PAK

Model FP-PA35A

35 W Audio Power Amplifier with Power Supply

Mounting
The FP-PA35A should be mounted in a location with good ventilation. If the module is mounted using a box that does not provide ventilation, the amplifier should be
secured to the outside surface of the box. The ambient operating environment must not exceed 40 degrees C.

™

SERIES

Sleep Mode is automatic after
the sleep delay time has
elapsed following absence of
input audio.

Sleep Mode may be activated
manually by repowering the
module with input audio absent.

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

TYPICAL PERFORMANCE

Input: Line level
(+4 dBu nominal balanced)
(-10 dBV nominal unbalanced)
Input Impedance: 20 k balanced bridging
10 k unbalanced
Input / Output Connectors: Detachable terminal block
Gain Adjustment: Single turn audio taper
Minimum Input Levels:

Balanced:.................. -14 dBu (to cross compressor threshold)

Unbalanced: ............. -15 dBV (to cross compressor threshold)

Maximum Input Levels:

Balanced:.................. +22 dBu

Unbalanced: ............. +20 dBV

Frequency Response: 50 Hz to 20 kHz (+/- 3 dB)*

THD+N: < 0.5% (@ 1 kHz)*
< 0.5% (50 Hz to 20 kHz, 1 W)
Compressor: Threshold 2 dB below rated output,
automatic adjusting attack and release times
Noise: <-75 dB (below 35 W RMS)
CMRR: > 60 dB (50 Hz to 120 Hz)
Output Power: 35 W RMS @ 25 V, 70 V or 100 V
Sleep Mode Power Consumption: < 1 W (amplifier and included power supply)
Sleep Mode Delay: 5, 15 or 25 minutes (selectable)
Sleep Mode Disable: Selectable
Active Mode Delay: < 150 mS after input audio detected
Audio Detector Threshold: -50 dBu balanced, -52 dBV unbalanced
Ambient Operating Environment: 0° C to 40° C Maximum; 20° C Recommended
Indicators (2): Red LED: PEAK LED indicates compressor activity
Blue LED: Power ON, Dim: Sleep mode active; Bright: Amplifier act ive
Power Supply (included): 100 to 240 Vac, 50-60 Hz; 24 Vdc output to module, Ground-referenced
Plenum Rating Standard: UL 2043
Dimensions: Height: 2.80 in.(7.1 cm); Widt h: 3.25 in.(8.26 cm); Length: 6.04 in.(15.3 cm)

*measured at compressor threshold level equaling 22 W RMS output power

NOTE: This equipment has been tested and found to
comply with the limits for a Class B digital device, pursuant
to part 15 of the FCC Rule. These limits ar e designed to
provide reasonable protection against harmful interfer ence
in a residential installation. The equipment generates,
uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions,
may cause harmful interference to radio communications .
However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does
cause harmful interference to radio or televis ion reception,
which can be determined by turning the equipment off an
on, the user is encouraged to try to correct the
interference by one or more of the following measures:

 Reorient or relocate the receiving antenna
 Increase the separation between the equipment

and receiver

 Connect the equipment into an outlet on a circuit

different from that which the receiver is
connected.

 Consult the dealer or an experienced radio/TV

technician for help.

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-2150F

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287