TDA7850A 4 x 50 W MOSFET quad bridge power amplifier plus HSD Features ■ High output power capability: – 4 x 50W/4Ω max. – 4 x 30W/4Ω @ 14.4V, 1KHz, 10% – 4 x 80W/2Ω max. – 4 x 55W/2Ω @ 14.4V, 1KHz, 10% ■ MOSFET output power stage ■ Excellent 2Ω driving capability ■ Hi-fi class distortion ■ Low output noise ■ St-by function ■ Mute function ■ Automute at min. supply voltage detection ■ Low external component count: – Internally fixed gain (26dB) – No external compensation – No bootstrap capacitors ■ On board 0.35A high side driver Flexiwatt27 (vertical) Flexiwatt27 (horizontal) ■ ESD Protections: ■ Output short circuit to GND, to Vs, across the load ■ Very inductive loads ■ Overrating chip temperature with soft thermal limiter ■ Output DC offset detection ■ Load dump voltage ■ Fortuitous open gnd ■ Reversed battery Description The TDA7850A is a breakthrough MOSFET technology class AB audio power amplifier in Flexiwatt27 package designed for high power car radio. The fully complementary P-Channel/NChannel output structure allows a rail to rail output voltage swing which, combined with high output current and minimized saturation losses sets new power references in the car-radio field, with unparalleled distortion performances. The TDA7850A integrates a DC offset detector. Table 1. Device summary Order code Package Packing TDA7850A Flexiwatt27 (vertical) Tube TDA7850AH Flexiwatt27 (horizontal Tube October 2007 Rev 1 1/16 www.st.com 1 Contents TDA7850A Contents 1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.5 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 TDA7850A List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3/16 List of figures TDA7850A List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. 4/16 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 4Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 2Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (RL = 4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (RL = 2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Power dissipation & efficiency vs. output power (RL = 4Ω, SINE) . . . . . . . . . . . . . . . . . . . 11 Power dissipation & efficiency vs. output power (RL = 2Ω, SINE) . . . . . . . . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 4Ω, audio program simulation) . . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 2Ω, audio program simulation) . . . . . . . . . . . . . 11 ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11 Flexiwatt27 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 13 Flexiwatt27 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 14 TDA7850A Block diagram and application circuit 1 Block diagram and application circuit 1.1 Block diagram Figure 1. Block diagram Vcc1 Vcc2 470μF 100nF ST-BY OFF DET MUTE HSD HSD/OFF DET OUT1+ OUT1- IN1 PW-GND 0.1μF OUT2+ OUT2- IN2 PW-GND 0.1μF OUT3+ OUT3- IN3 PW-GND 0.1μF OUT4+ OUT4- IN4 PW-GND 0.1μF AC-GND SVR 0.47μF TAB S-GND 47μF D03AU1467 1.2 Standard test and application circuit Figure 2. Standard test and application circuit C8 0.1μF C7 2200μF Vcc1-2 Vcc3-4 7 R1 ST-BY 21 10 5 10K R2 C9 1μF MUTE 9 23 47K C10 1μF 6 C1 IN1 3 12 18 13 19 C2 0.1μF IN3 OUT3 20 16 C3 0.1μF 22 25 15 IN4 C4 0.1μF OUT2 4 0.1μF IN2 OUT1 8 S-GND 14 17 C5 0.47μF OUT4 24 11 SVR C6 47μF 26 1, 27 HSD/OFF DET 2 OFF DET TAB D03AU1469 5/16 Pin description 2 TDA7850A Pin description Figure 3. Pin connection (top view) TAB 1 OFF DET PW-GND OUT2ST-BY OUT2+ VCC OUT1PW-GND OUT1+ SVR IN1 IN2 Vertical S-GND IN4 IN3 AC-GND OUT3+ PW-GND OUT3VCC OUT4+ MUTE OUT4PW-GND HSD TAB 27 TAB 1 D03AU1468 OFF DET PW-GND OUT2ST-BY OUT2+ VCC OUT1PW-GND OUT1+ SVR IN1 IN2 Horizontal S-GND IN4 IN3 AC-GND OUT3+ PW-GND OUT3VCC OUT4+ MUTE OUT4PW-GND HSD TAB 27 AC00107 6/16 TDA7850A Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Value Unit Operating supply voltage 18 V VS (DC) DC supply voltage 28 V VS (pk) Peak supply voltage (for t = 50ms) 50 V Output peak current repetitive (duty cycle 10% at f = 10Hz) non repetitive (t = 100μs) 9 10 A A Power dissipation Tcase = 70°C 80 W Tj Junction temperature 150 °C Tstg Storage temperature -55 to 150 °C Value Unit 1 °C/W VS IO Ptot 3.2 Parameter Thermal data Table 3. Thermal data Symbol Rth j-case Parameter Thermal resistance junction to case Max. 3.3 Electrical characteristics Table 4. Electrical characteristics (Refer to the test and application diagram, VS = 14.4V; RL = 4Ω; Rg = 600Ω; f = 1KHz; Tamb = 25°C; unless otherwise specified). Symbol Iq1 VOS Parameter Quiescent current RL = ∞ Output offset voltage Play mode - Mute mode During mute ON/OFF output offset voltage dVOS Test Condition During St-By ON/OFF output offset voltage Gv Voltage gain dGv Channel gain unbalance ITU R-ARM weighted see Figure 18 Min. Typ. Max. Unit 100 180 280 mA ±60 mV -10 +10 mV -10 +10 mV 27 dB ±1 dB 25 26 7/16 Electrical specifications Table 4. Electrical characteristics (continued) (Refer to the test and application diagram, VS = 14.4V; RL = 4Ω; Rg = 600Ω; f = 1KHz; Tamb = 25°C; unless otherwise specified). Symbol Po TDA7850A Parameter Output power Test Condition Min. Typ. Max. Unit VS = 13.2V; THD = 10% VS = 13.2V; THD = 1% VS = 14.4V; THD = 10% VS = 14.4V; THD = 1% 23 16 28 20 25 19 30 23 W VS = 14.4V; THD = 10%, 2Ω 50 55 W 50 85 W Max. output power(1) VS = 14.4V; RL = 4Ω VS = 14.4V; RL = 2Ω THD Distortion Po = 4W Po = 15W; RL = 2Ω eNo Output noise "A" Weighted Bw = 20Hz to 20KHz SVR Supply voltage rejection f = 100Hz; Vr = 1Vrms 50 75 dB fch High cut-off frequency PO = 0.5W 100 300 KHz Ri Input impedance 80 100 120 KΩ CT Cross talk 60 70 60 - dB ISB St-By current consumption Ipin5 Po max. f = 1KHz PO = 4W f = 10KHz PO = 4W 0.006 0.015 0.05 0.07 % 35 50 50 70 μV VSt-By = 1.5V 20 VSt-By = 0V 10 St-by pin current VSt-By = 1.5V to 3.5V ±1 VSB out St-By out threshold voltage (Amp: ON) VSB in St-By in threshold voltage (Amp: OFF) Mute attenuation POref = 4W 80 VM out Mute out threshold voltage (Amp: Play) 3.5 VM in Mute in threshold voltage (Amp: Mute) VS automute threshold (Amp: Mute) Att ≥ 80dB; POref = 4W (Amp: Play) Att < 0.1dB; PO = 0.5W AM VAM in Ipin23 Muting pin current 2.75 90 7 VMUTE = 3.5V -5 V dB V 1.5 VMUTE = 1.5V (Sourced Current) μA V 1.5 6.5 μA 7 V V 7.5 8 12 18 μA 18 μA 0.6 V 800 mA HSD section Vdropout Iprot 8/16 Dropout voltage Current limits IO = 0.35A; VS = 9 to 16V 0.25 400 TDA7850A Electrical specifications Table 4. Electrical characteristics (continued) (Refer to the test and application diagram, VS = 14.4V; RL = 4Ω; Rg = 600Ω; f = 1KHz; Tamb = 25°C; unless otherwise specified). Symbol Parameter Test Condition Min. Typ. Max. Unit Offset detector (Pin 26) VM_ON 8 Mute voltage for DC offset detection enabled VM_OFF V Vstby = 5V VOFF Detected differential output offset Vstby = 5V; Vmute = 8V ±2 V26_T Pin 26 voltage for detection = TRUE Vstby = 5V; Vmute = 8V VOFF > ±4V 0 V26_F Pin 26 Voltage for detection = FALSE Vstby = 5V; Vmute = 8V VOFF > ±2V 12 ±3 6 V ±4 V 1.5 V V 1. Saturated square wave output. 3.4 Electrical characteristic curves Figure 4. Quiescent current vs. supply voltage 200 Figure 5. Po (W) Id (mA) 80 75 70 Vi = 0 RL = ∞ 190 180 Output power vs. supply voltage (RL = 4Ω) Po-max RL= 4Ω f = 1 KHz 65 60 170 55 50 160 THD= 10% 45 40 150 140 35 30 130 25 20 120 THD= 1% 15 10 110 100 5 8 10 12 14 16 18 Vs (V) Figure 6. 8 9 10 11 12 Output power vs. supply voltage (RL = 2Ω) 13 14 15 16 Vs (V) AC00064 Figure 7. Po (W) 17 18 AC00064 Distortion vs. output power (RL = 4Ω) THD (%) 130 10 120 Po-max 110 VS = 14.4 V RL = 4Ω RL= 2Ω f = 1 KHz 100 1 90 THD=10% 80 f = 10 KHz 70 0.1 60 50 THD=1% 40 f = 1 KHz 0.01 30 20 10 0 8 9 10 11 12 13 Vs (V) 14 15 16 17 18 AC00066 0.001 0.1 1 10 Po (W) 100 AC00067 9/16 Electrical specifications Figure 8. TDA7850A Distortion vs. output power (RL = 2Ω) Figure 9. THD (%) Distortion vs. frequency (RL = 4Ω) THD (%) 10 10 VS = 14.4 V RL = 2Ω VS = 14.4 V RL = 4Ω Po = 4 W 1 1 f = 10 KHz 0.1 0.1 f = 1 KHz 0.01 0.01 0.001 0.001 0.1 1 10 Po (W) 100 1000 10000 100000 AC00069 f (Hz) AC00068 Figure 10. Distortion vs. frequency (RL = 2Ω) Figure 11. Crosstalk vs. frequency CROSSTALK (dB) THD (%) -20 10 -30 VS = 14.4 V RL = 2Ω Po = 8 W 1 10 100 RL = 4Ω Po = 4 W Rg = 600Ω -40 -50 -60 0.1 -70 0.01 -80 0.001 -100 -90 10 100 1000 10000 10 100000 Figure 12. Supply voltage rejection vs. frequency 10000 100000 AC00071 Figure 13. Output attenuation vs. supply voltage OUTPUT ATTN (dB) 0 Rg = 600Ω Vripple = 1 Vrms -30 1000 f (Hz) SVR (dB) -20 100 AC00070 f (Hz) RL = 4Ω Po = 4 W ref -40 -20 -50 -40 -60 -70 -60 -80 -80 -90 -100 -100 10 100 1000 f (Hz) 10/16 10000 100000 AC00072 5 6 7 8 Vs (V) 9 10 AC00073 TDA7850A Electrical specifications Figure 14. Power dissipation & efficiency vs. output power (RL = 4Ω, SINE) η (%) Ptot (W) 90 Figure 15. Power dissipation & efficiency vs. output power (RL = 2Ω, SINE) η (%) Ptot (W) 90 180 80 160 70 140 60 60 120 50 50 100 40 40 80 30 30 60 30 20 20 40 20 10 10 20 10 0 0 0 η 80 VS = 14.4 V RL = 4 x 4Ω f = 1 KHz SINE 70 VS = 14.4 V RL = 4 x 2Ω f = 1 KHz SINE 80 η 70 60 50 2 4 6 8 10 12 14 16 18 20 22 24 26 Po (W) 28 30 40 Ptot Ptot 0 90 0 0 5 10 15 20 25 30 35 40 45 50 Po (W) AC00074 55 AC00075 Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power (RL = 4Ω, audio program simulation) (RL = 2Ω, audio program simulation) Ptot (W) 30 55 VS = 13.2 V RL = 4 x 4Ω GAUSSIAN NOISE 25 Ptot (W) 60 VS = 13.2 V RL = 4 x 2Ω GAUSSIAN NOISE 50 45 CLIP START 40 20 CLIP START 35 30 15 25 20 10 15 10 5 5 0 1 2 3 4 5 6 AC00076 Po (W) 0 2 4 6 Po (W) 8 10 AC00077 Figure 18. ITU R-ARM frequency response, weighting filter for transient pop Output attenuation (dB) 10 0 -10 -20 -30 -40 -50 10 100 1000 Hz 10000 100000 AC00343 11/16 Application hints 4 TDA7850A Application hints Ref. to the circuit of Figure 2. 4.1 SVR Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during ON/OFF transients. To conveniently serve both needs, Its minimum recommended value is 10µF. 4.2 Input stage The TDA7850A's inputs are ground-compatible and can stand very high input signals (± 8Vpk) without any performance degradation. If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off will amount to 16 Hz. 4.3 Stand-by and muting STAND-BY and MUTING facilities are both CMOS compatible. In absence of true CMOS ports or microprocessors, a direct connection to Vs of these two pins is admissible but a 470kΩ equivalent resistance should be present between the power supply and the muting and stand-by pins. R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. About the stand-by, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5V/ms. 4.4 DC offset detector The TDA7850A integrates a DC offset detector to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs which may lead to speakers damage for overheating. The feature works with the amplifier unmuted and no signal at the inputs. The DC offset detection can be available at 2 different pins: – – 4.5 Pin 2 (always enabled) Pin 26. Only enabled if Vmute (pin23) is set higher than 8V. If not (Vmute < 6 V) pin 26 will revert to the original HSD function. Heatsink definition Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be deduced from Figure 16, which reports the simulated power dissipation when real music/speech programmes are played out. Noise with gaussian-distributed amplitude was employed for this simulation. Based on that, frequent clipping occurrence (worst-case) will cause Pdiss = 26W. Assuming Tamb = 70°C and TCHIP = 150°C as boundary conditions, the heatsink's thermal resistance should be approximately 2°C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation. 12/16 TDA7850A Package information In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 19. Flexiwatt27 (vertical) mechanical data and package dimensions DIM. MIN. 4.45 1.80 A B C D E F (1) G G1 H (2) H1 H2 H3 L (2) L1 L2 (2) L3 L4 L5 M M1 N O R R1 R2 R3 R4 V V1 V2 V3 0.75 0.37 0.80 25.75 28.90 22.07 18.57 15.50 7.70 3.70 3.60 mm TYP. 4.50 1.90 1.40 0.90 0.39 1.00 26.00 29.23 17.00 12.80 0.80 22.47 18.97 15.70 7.85 5 3.5 4.00 4.00 2.20 2 1.70 0.5 0.3 1.25 0.50 MAX. 4.65 2.00 MIN. 0.175 0.070 1.05 0.42 0.57 1.20 26.25 29.30 0.029 0.014 0.031 1.014 1.139 22.87 19.37 15.90 7.95 0.869 0.731 0.610 0.303 4.30 4.40 0.145 0.142 inch TYP. 0.177 0.074 0.055 0.035 0.015 0.040 1.023 1.150 0.669 0.503 0.031 0.884 0.747 0.618 0.309 0.197 0.138 0.157 0.157 0.086 0.079 0.067 0.02 0.12 0.049 0.019 MAX. 0.183 0.079 OUTLINE AND MECHANICAL DATA 0.041 0.016 0.022 0.047 1.033 1.153 0.904 0.762 0.626 0.313 0.169 0.173 5˚ (Typ.) 3˚ (Typ.) 20˚ (Typ.) 45˚ (Typ.) Flexiwatt27 (vertical) (1): dam-bar protusion not included (2): molding protusion included V C B V H H1 V3 A H2 O H3 R3 L4 R4 V1 R2 L2 N R L3 5 Package information L L1 V1 V2 R2 D R1 L5 Pin 1 R1 R1 E G G1 F FLEX27ME M M1 7139011 13/16 Package information TDA7850A Figure 20. Flexiwatt27 (horizontal) mechanical data and package dimensions DIM. A B C D E F (1) G G1 H (2) H1 H2 H3 L (2) L1 L2 (2) L3 L4 L5 L6 M M1 M2 N P R R1 R2 R3 R4 V V1 V2 V3 MIN. 4.45 1.80 0.37 0.80 25.75 28.90 21.64 10.15 15.50 7.70 5.15 1.80 2.75 3.20 mm TYP. 4.50 1.90 1.40 2.00 0.39 1.00 26.00 29.23 17.00 12.80 0.80 22.04 10.5 15.70 7.85 5 5.45 1.95 3.00 4.73 5.61 2.20 3.50 1.70 0.50 0.30 1.25 0.50 MAX. 4.65 2.00 MIN. 0.175 0.070 0.42 0.57 1.20 26.25 29.30 0.014 0.031 1.014 1.139 22.44 10.85 15.90 7.95 0.852 0.40 0.610 0.303 5.85 2.10 3.50 0.203 0.070 0.108 3.80 0.126 inch TYP. 0.177 0.074 0.055 0.079 0.015 0.040 1.023 1.150 0.669 0.503 0.031 0.868 0.413 0.618 0.309 0.197 0.214 0.077 0.118 0.186 0.220 0.086 0.138 0.067 0.02 0.12 0.049 0.02 MAX. 0.183 0.079 OUTLINE AND MECHANICAL DATA 0.016 0.022 0.047 1.033 1.153 0.883 0.427 0.626 0.313 0.23 0.083 0.138 0.15 5˚ (Typ.) 3˚ (Typ.) 20˚ (Typ.) 45˚ (Typ.) Flexiwatt27 (Horizontal) (1): dam-bar protusion not included; (2): molding protusion included 7399738 A 14/16 TDA7850A 6 Revision history Revision history Table 5. Document revision history Date Revision 9-Oct-2007 1 Changes Initial release. 15/16 TDA7850A Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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