TFA9800J/N1,112 NXP Semiconductors, TFA9800J/N1,112 Datasheet - Page 7

• Manufacturer Part Number: TFA9800J/N1,112
• Description: IC AMP AUDIO PWR 7W STER AB 9SIL
• Manufacturer: NXP Semiconductors
• Type: Class ABr

Specifications of TFA9800J/N1,112

• Output Type: 2-Channel (Stereo)
• Package / Case: 9-SIL (Bent and Staggered Leads)
• Max Output Power X Channels @ Load: 7W x 2 @ 4 Ohm
• Voltage - Supply: 6 V ~ 18 V
• Features: Depop, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Product: Class-AB
• Output Power: 7 W
• Available Set Gain: 20 dB
• Thd Plus Noise: 0.1 %
• Operating Supply Voltage: 15 V
• Supply Current: 40 mA
• Maximum Power Dissipation: 25 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Audio Load Resistance: 4 Ohms
• Input Signal Type: Differential
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Single
• Supply Type: Single
• Supply Voltage (max): 18 V
• Supply Voltage (min): 6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935279697112; TFA9800J; TFA9800J

Philips Semiconductors
12. Application information
TFA9800J_1
Preliminary data sheet
12.1 Printed-Circuit Board (PCB) layout and grounding
12.2 Input configuration
12.3 Built-in protection circuits
For high system performance level, certain grounding techniques are imperative. The
input reference grounds have to be tied with their respective source grounds and must
have separate traces from the power ground traces; this will prevent the large (output)
signal currents from interfering with the small AC input signals. The small-signal ground
traces should be physically located as far as possible from the power ground traces. The
width of supply and output traces should be as large as practical for delivering maximum
output power.
Proper supply bypassing is critical for low noise performance and high power supply
rejection. The respective capacitor locations should be as close as possible to the device
and grounded to the power ground. Proper power supply decoupling also prevents
oscillations. For suppressing higher frequency transients (spikes) on the supply line a
capacitor with low Equivalent Series Resistance (ESR), typical 0.1 F, has to be placed as
close as possible to the device. For suppressing lower frequency noise and ripple signals,
a large electrolytic capacitor, e.g. 1000 F or greater, must be placed close to the
TFA9800J.
In a single-ended (stereo) application a bypass capacitor on the SVRR pin reduces the
noise and ripple on the mid-rail voltage. For good THD and noise performance a low ESR
capacitor is recommended.
It should be noted that the DC level of the input pins is about 2.1 V, therefore a coupling
capacitor is necessary.
The input cut-off frequency is:
This calculation shows that it is not necessary to use high capacitor values for the input;
so the delay during switch-on, which is necessary for charging the input capacitors, can
be minimized. This results in a good low frequency response and good switch-on
behavior.
For stereo application (single-ended) coupling capacitors on both input and output are
necessary.
The TFA9800J contains two kinds of protection circuits:
•
•
Short-circuit of outputs to ground, supply and across the load: short-circuit is detected
and controlled by a Safe Operating ARea (SOAR) protection circuit.
Thermal shutdown protection: the junction temperature is measured by a temperature
sensor; at a junction temperature of > 150 C, thermal fold back is activated.
Rev. 01 — 17 March 2006
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© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
7 W stereo power amplifier
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TFA9800J
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