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TFA9815T
Stereo full-bridge audio amplifier 2 x 17 W
General descriptionThe TFA9815isa 2-channel power comparatorfor high-efﬁciency classD audio ampliﬁer
systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive logic,
protection control logic and full differential input comparators. By using this power
comparator a compact closed-loop self-oscillating digital audio ampliﬁer system or
open-loop system can be built. The continuous output power is 2 ×17 W in a full-bridge
BTL application. The TFA9815 does not require a heat sink and operates using an
asymmetrical supply voltage. Features Stereo full-bridge audio ampliﬁer for class D applications No external heat sink required Operating voltage range: asymmetrical from 8 V to 20 V Thermally protected Zero dead-time switching Current-limiting (no audible interruptions) Applications Self-oscillating or open-loop class D audio ampliﬁer applications Flat-panel television sets Flat-panel monitors Multimedia systems Wireless speakers High-end CRT television sets Quick reference data A9815
Stereo full-bridge audio ampliﬁer 2 x 17 W
Rev. 01 — 16 December 2008 Preliminary data sheet
Table 1. Quick reference data = 12 V; fosc = 550 kHz; Tamb = 25 °C; typical application diagram Figure 12, unless otherwise
speciﬁed.
General supply voltage single, asymmetrical
supply (VDD -VSS) 1220V supply current Sleep mode - 110 200 μA
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W Ordering information
Iq(tot) total quiescent
current
Operating mode; no
load; no snubbers; no
ﬁlter connected 4050mA
ηpo output power
efﬁciency
output power;×10W into8Ω 91 - %
Po(RMS) RMS output
power =15V; RL = 8Ω;
THD = 10 % 16 - W =12V; RL = 8Ω;
THD = 10 %
910 - W =12V; RL = 6Ω;
THD =10% 13 - W =12V; RL = 4Ω;
THD =10% 18 - W
Table 1. Quick reference data …continued = 12 V; fosc = 550 kHz; Tamb = 25 °C; typical application diagram Figure 12, unless otherwise
speciﬁed.
Table 2. Ordering information
TFA9815T SO32 plastic small outline package; 32 leads; body width 7.5 mm SOT287-1
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W Block diagram
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W Pinning information
7.1 Pinning
The SO32 package has four corner leads. These leads (1, 16, 17 and 32) are internally
connected to the die pad and must be connected to VSSA. Together with the applied
copper area on the PCB these leads determine the ambient temperature, which affects
the thermal resistance of the junction.
7.2 Pin description
Table 3. Pin description
VSSD(HW) 1 negative digital supply voltage and handle-wafer connection
IN1P 2 positive input comparator channel 1
IN1N 3 negative input comparator channel 1
VDDA1 4 positive analog supply voltage channel 1
VSSA1 5 negative analog supply voltage channel 1
SO/OL 6 self-oscillating / open-loop conﬁguration enable
ENABLE 7 enable input to switch between Sleep and Operating mode
CDELAY 8 switch on/off timing control
n.c. 9 not connected
DIAG 10 diagnostic output; open-drain
TEST 11 test signal input; for testing purposes only
VSSA2 12 negative analog supply voltage channel 2
VDDA2 13 positive analog supply voltage channel 2
IN2N 14 negative input comparator channel 2
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W Functional description
8.1 General
The TFA9815 is a dual-switching power comparator. It is the main building block for a
stereo high-efﬁciency Class D audio power ampliﬁer system. It contains two full-bridge
BTL power stages, drive logic, protection control logic and full differential input
comparators and references (see Figure 1). By using this power comparator a compact
closed-loop self-oscillating digital ampliﬁer system or open-loop system can be built. A
second-order low-pass ﬁlter converts the PWM output signal into an analog audio signal
across the speaker.
8.2 Interfacing
The pins ENABLE and SO/OL control the Operating mode of the TFA9815. Both the
ENABLE and the SO/OL pins are referenced to VSSD(HW).
When the SO/OL pin is connected to VSSD(HW) the TFA9815 is in self-oscillating
conﬁguration: when the SO/OL pin is ﬂoating the TFA9815 is in open-loop conﬁguration.
Under this latter condition the open-pin voltage is typically 4 V applied internally. The
TEST pin needs to be connected to ground in both situations.
IN2P 15 positive input comparator channel 2
VSSD(HW) 16 negative digital supply voltage and handle-wafer connection
VSSD(HW) 17 negative digital supply voltage and handle-wafer connection
STAB2 18 decoupling of internal 11 V regulator for channel 2 drivers
VSSP2 19 negative power supply voltage channel 2
BOOT2N 20 bootstrap high-side driver negative output channel 2
OUT2N 21 negative output channel 2
BOOT2P 22 bootstrap high-side driver positive output channel 2
OUT2P 23 positive output channel 2
VDDP2 24 positive power supply voltage channel 2
VDDP1 25 positive power supply voltage channel 1
OUT1P 26 positive output channel 1
BOOT1P 27 bootstrap high-side driver positive output channel 1
OUT1N 28 negative output channel 1
BOOT1N 29 bootstrap high-side driver negative output channel 1
VSSP1 30 negative power supply voltage channel 1
STAB1 31 decoupling of internal 11 V regulator for channel 1 drivers
VSSD(HW) 32 negative digital supply voltage and handle-wafer connection
Table 3. Pin description …continued
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W
The device has two modes: Sleep and Operating. Sleep mode the TFA9815is not biased and hasa very low supply current. Sleep mode
can also be used to quickly mute the device.
When the TFA9815 is set into Operating mode the device is started via the start-up
sequence, which provides a pop-free start-up behavior. After start-up the STABn
reference voltages are present and the outputs start switching.
8.3 Input comparators
The input stages have a differential input and are optimized for low noise and offset. This
results in maximum ﬂexibility in the application.
Operating in self-oscillating conﬁguration the inputs (IN1P , IN1N, IN2P, IN2N) of the
comparators are internally set to a voltage level of V P, but only during the start-up
sequence. In Operating mode the inputs are high-ohmic.
Operating in open-loop conﬁguration, no internal voltages are applied to the inputs. The
input pins (IN1P , IN1N, IN2P , IN2N) are pulled down to VSSA1 and VSSA2 level by internal
resistors.
8.4 Diagnostic
The DIAG outputisan open-drain output. The maximum currentis2 mA. When oneof the
protections is activated the DIAG output is set LOW. The DIAG output refers to VSSD.
Table 4. SO/OL connections
VSSD(HW) Self-oscillating
Open Open-loop
Table 5. Start-up
ENABLE < 0.8 V Sleep mode
ENABLE > 3 V Operating mode
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W
8.5 Protections
The TFA9815 has the following protections: OverTemperature Protection (OTP) OverCurrent Protection (OCP) OverVoltage Protection (OVP) UnderVoltage Protection (UVP) OverDissipation Protection (ODP) Window Protection (WP)
When either the OTPor the OCP are activated the output power stageis switchedoff and
all the outputs (OUT1N, OUT1P , OUT2N and OUT2P) become ﬂoating. The power stage
will switch back on after 5 μs or as soon as the fault condition is removed.
When any other protection is activated (OVP , UVP, ODP , or WP) all the outputs become
ﬂoating and the device shuts down. The TFA9815 will resume operating after the fault
condition has been removed, going through the restart sequence shown in Figure3.
Restarting will typically take 500 ms, depending on the power-supply voltage level. Overtemperature protection
If the junction temperature (Tj) exceeds a threshold level of about 150 °C the outputs
become ﬂoating. The device will start switching again after 5 ms and when the
temperature is below 150 °C. This thermal limitation is without audible interruptions. Overcurrent protection
If the output current exceeds the maximum output-current threshold level the outputs
become ﬂoating. The device will start switching again after5 μs. This current limitation
is without audible interruptions. Overvoltage protection
If the supply voltage applied to the TFA9815 exceeds the maximum supply-voltage
threshold level the device shuts down. The device will resume operating when the
supply is within the operating range, going through the restart sequence. Undervoltage protection
If the supply voltage applied to the TFA9815 falls below the minimum supply-voltage
threshold level the device shuts down. The device will resume operating when the
supply is within the operating range, going through the restart sequence. Overdissipation protection the junction temperature (Tj) exceeds 135°Can internal OverTemperature Warning
(OTW) signalis generated.If the overcurrent protectionis generated while the OTWis
active the device will shut down and resume operating automatically, going through
the restart sequence. Window protection
During start-up, if one of the outputs is shorted to VSS or VDD the device will interrupt
the start-up sequence and wait until the short is removed. This is an effective
measure to protect the device against shorts between the outputs (before the ﬁlter)
and the ground or supply lines. The WP protects the device against errors made
during board assembly.
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W
8.6 Timing diagram
Table 6. Overview protections
OTP Tj > 150°C LOW Floating Automatic, after 5 μs and Tj < 150°C
OCP IO > IORM LOW Floating Automatic, after 5μs
OVP VP > 20 V LOW Floating Switch-off to restart when VP < 20 V
UVP VP < 8 V LOW Floating Switch-off to restart when VP > 8 V
ODP Tj > 135 °C and IO > IORM LOW Floating Switch-off to restart OUTX > VDDA − 1 V or OUTX < VSSA + 1 V LOW Start-up after removing fault condition
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W Internal circuitry
Table 7. Internal circuitry
1VSSD(HW) VSSD(HW) VSSD(HW) VSSD(HW) IN1P IN1N IN2N IN2P
4VDDA1
5VSSA1 VSSA2 VDDA2 SO/OL
VDDA
VSSA
1,16, 17, 32
010aaa384
VSSA1, VSSA2
VDDA1, VDDA22, 14
3, 15
010aaa385
4, 12
5, 13
010aaa386
VSSA
010aaa381
VDDA1
VSSA1
VDDA1
50 mA
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W ENABLE CDELAY DIAG TEST
Table 7. Internal circuitry …continued
3 kW
VSSA
VDDA1
010aaa387
VDDA1
DISCHARGE
VSSA1
010aaa379
VDDA1
VSSA1 VSSD
010aaa030
VDDA1
VSSA1
010aaa031
9 V
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W STAB2 STAB1 VSSP2 VDDP2 VDDP1 VSSP1 BOOT2N BOOT1N OUT2N OUT2P OUT1P OUT1N BOOT2P BOOT1P
Table 7. Internal circuitry …continued
VSSD
50 mA
18, 31
VDDA1, VDDA2
010aaa445
19, 30
24, 25
010aaa446
OUT2N, OUT1N
20, 29
010aaa447
VDDP1, VDDP2
21, 23, 26, 28
VSSP1, VSSP2
010aaa380
12 V
OUT2P
22, 27
010aaa448
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W
10. Limiting values
[1] Human-body model (HBM): RS = 1500 Ω; C = 100 pF; for pins 2, 3, 14, and 15: Vesd = ±1500 V.
[2] Machine model (MM): RS = 0 Ω; C = 200 pF; L = 0.75 μH.
11. Thermal characteristics
[1] Measured in a JEDEC high K-factor test board (standard EIA/JESD 51-7) in free air with natural convection.
[2] Two-layer application board (70 mm x 57 mm), 35 μm copper, FR4 base material in free air with natural convection.
[3] Strongly depends on where the measurement is taken on the package.
Table 8. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). supply voltage Asymmetrical −0.3 +23.1 V
IORM repetitive peak output
current - A junction temperature - - 180 °C
Tstg storage temperature - −55 +150 °C
Tamb ambient temperature - −40 +85 °C
Pmax maximum power
dissipation 5 W voltage on pin x DIAG VSS − 0.3 12 V
IN1P - IN1N −6+6 V
IN2P - IN2N −6+6 V
all other pins VSS− 0.3 VDD+ 0.3V
Vesd electrostatic discharge
voltage
HBM [1] −2000 +2000 V [2] −200 +200 V
Table 9. Characteristics
Rth(j-a) thermal resistance from junction
to ambient
JEDEC test board [1]- 3942K/W
Two-layer application
board
[2]- 42 - K/W
Ψj-lead thermal characterization
parameter from junction to lead --30 K/W
Ψj-top thermal characterization
parameter from junction to top of
package [3] --8 K/W
NXP Semiconductors TFA9815
Audio ampliﬁer 2 x 17 W
12. Characteristics
12.1 Static characteristics
Table 10. Characteristics
VP= 12 V;Tamb = 25 ˚C; fosc = 550 kHz; typical application diagram Figure 12, unless otherwise speciﬁed.
Supply voltage supply voltage single asymmetrical supply
(VDD− VSS)
812 20 V supply current Sleep mode - 110 200 μA
Iq(tot) total quiescent current Operating mode; no load, no
snubbers and no ﬁlter connected
-40 50 mA
Series resistance output power switches
RDSon drain-source on-state resistance Tj = 25°C - 150 220 mΩ
Enable input: pin ENABLE[1]
VIL LOW-level input voltage Sleep mode - - 0.8 V
VIH HIGH-level input voltage Operating mode 3 - VP V input current VI = 5 V - 1 20 μA
SO/OL input: pin SO/OL[1]
VIL LOW-level input voltage self-oscillating conﬁguration 0 - 0.4 V
VIH HIGH-level input voltage open-loop conﬁguration 3 4 5 V
Stabilizer output pins STAB1 and STAB2 output voltage Operating mode [1] 10.2 11 11.7 V
Comparator full-differential input stage
Voffset(i)(eq) equivalent input offset voltage - - - 1 mV
Vn(i)(eq) equivalent input noise voltage 20 Hz < f < 20 kHz - - 15 μV
Vi(cm) common-mode input voltage - VSSA + 3- VDDA
− 1
IIB input bias current - - - 1 μA
Overtemperature protection
Tact(th_prot) thermal protection activation
temperature 150 - 180 °C
Overvoltage protection
Vth(ovp) overvoltage protection threshold
voltage
level internal ﬁxed 20.1 21.5 23 V
Undervoltage protection
VP(uvp) undervoltage protection supply
voltage
level internal ﬁxed 7 7.5 7.9 V
Overcurrent protection
IO(ocp) overcurrent protection output
current [2] 3 3.5 - A

Partno	Mfg	Dc	Qty	Available	Descript
TFA9815T	NXP	N/a	789	avai	Stereo full-bridge audio amplifier 2 x 17 W