Ordering number: 2136B Thick Film Hybrid IC STK4171V AF Power Amplifier (Split Power Supply) (40W + 40W min, THD = 0.08%) Features Package Dimensions • Pin-compatible with the STK4102II series. The STK4101V series use the same package and are available for output 15W to 50W. • Built-in muting circuit to cut off various kinds of pop noise • Greatly reduced heat sink due to substrate temperature 125°C guaranteed • Distortion 0.08% due to current mirror circuit • Excellent cost performance unit: mm 4040 [STK4171V] Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Thermal resistance Junction temperature Operating substrate temperature Ratings Unit VCC max Symbol Conditions ±49 V θj-c 1.8 °C/W Tj 150 °C Tc Storage temperature Tstg Available time for load short-circuit ts *1 VCC = ±32.5V, RL = 8Ω, f = 50Hz, Po = 40W 125 °C −30 to +125 °C 2 s Ratings Unit Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Recommended supply voltage VCC ±32.5 V Load resistance RL 8 Ω SANYO Electric Co., Ltd. Semiconductor Business Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 70997HA (ID) / 8308TA No. 2136—1/8 STK4171V Operating Characteristics at Ta = 25°C, VCC = ±32.5V, RL = 8Ω, VG = 40dB, Rg = 600Ω, RL : non-inductive load Parameter Quiescent current Symbol Frequency response Input impedance Output noise voltage typ max Unit 100 mA VCC = ±39V 20 PO (1) 40 W PO (2) VCC = ±28V, THD = 1.0%, RL = 4Ω, f = 1kHz 45 W THD PO = 1.0W, f = 1kHz fL, fH +0 PO = 1.0W, dB –3 ri VNO *2 Neutral voltage VN Muting voltage VM Notes. min THD = 0.08%, f = 20Hz to 20kHz ICCO Output power Total harmonic distortion Conditions 40 0.08 PO = 1.0W, f = 1kHz 20 to 50k Hz 55 kΩ VCC = ±39V, Rg = 10kΩ VCC = ±39V % 1.2 mVrms –70 0 +70 mV –2 –5 –10 V For power supply at the time of test, use a constant-voltage power supply unless otherwise specified. *1 For measurement of the available time for load short-circuit and output noise voltage, use the specified transformer power supply shown right. *2 The output noise voltage is represented by the peak value on rms scale (VTVM) of average value indicating type. For AC power supply, use an AC stabilized power supply (50Hz) to eliminate the effect of flicker noise in AC primary line. Specified Transformer Power Supply (Equivalent to MG-200) Equivalent Circuit No. 2136—2/8 STK4171V Sample Application Circuit Output power, PO - W Total harmonic distortion, THD - % Sample Printed Circuit Pattern for Application Circuit (Cu-foiled side) Input voltage, Vi - mV Output power, PO - W No. 2136—3/8 Voltage gain, VG - dB Output power, PO - W Output power, PO - W Supply voltage, VCC - V Frequency, f - Hz Neutral voltage, VN - mV Quiescent current, ICCO - mA Voltage gain, VG - dB Output power, PO - W Total harmonic distortion, THD - % STK4171V Frequency, f - Hz Frequency, f - Hz Operating substrate temperature, Tc - °C No. 2136—4/8 Output power, PO - W IC Power dissipation, Pd - W Supply voltage, VCC - V IC Power dissipation, Pd - W Neutral voltage, VN - mV Quiescent current, ICCO - mA STK4171V Output power, PO - W Description of External Parts No. 2136—5/8 STK4171V C3, C4 Input filter capacitors • A filter formed with R5 or R6 can be used to reduce noise at high frequencies. C5, C6 Input coupling capacitors • Used to block DC current. When the reactance of the capacitor increases at low frequencies, the dependence of 1/f noise on signal source resistance causes the output noise to worsen. It is better to decrease the reactance. • To reduce the pop noise at the time of application of power, it is effective to increase C5, C6 that fix the time constant on the input side and to decrease C9, C10 on the NF side. C9, C10 NF capacitors • These capacitors fix the low cutoff frequency as shown below. 1 - [Hz] f L = -------------------------2π ⋅ C9 ⋅ R7 To provide the desired voltage gain at low frequencies, it is better to increase C9. However, do not increase C9 more than needed because the pop noise level becomes higher at the time of application of power. C19 Decoupling capacitor • Used to eliminate the ripple components that mix into the input side from the power line (+VCC). C15, C16 Bootstrap capacitors • When the capacitor value is decreased, the distortion is liable to be higher at low frequencies. C17, C18 Oscillation blocking capacitors • Must be inserted as close to the IC power supply pins as possible so that the power supply impedance is decreased to operate the IC stably. • Electrolytic capacitors are recommended for C17, C18. C20 Capacitor for ripple filter • Capacitor for the TR12-used ripple filter in the IC system C13 Oscillation blocking capacitor • A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C13. R5, R6 Resistors for input filter R3, R4 Input bias resistors • Used to bias the input pin potential to zero. These resistors fix the input impedance practically. R7, R9 (R8, R10) These resistors fix voltage gain VG. It is recommended to use R7 (R8) = 560Ω, R9 (R10) = 56kΩ for VG = 40dB. • To adjust VG, it is desirable to change R7 (or R8). • When R7 (or R8) is changed to adjust VG, R3 (=R4) =R9 (=R10) must be set to ensure VN balance. R11, R20 (R12, R21) Bootstrap resistors • The quiescent current is set by these resistors 3.3kΩ + 3.3kΩ. It is recommended to use this resistor value. R15 R14 Resistor for ripple filter • (Limiting resistor for predriver TR at the time of load short) Used to ensure plus/minus balance at the time of clip. R18, R19 Resistor for ripple filter • When muting TR13 is turned ON, current flows from ground to -VCC through TR 13. It is recommended to use 1kΩ (1W) + 1kΩ (1W) allowing for the power that may be dissipated on that occasion. R24, R25 Oscillation blocking resistors R22, R23 L1, L2 Oscillation blocking resistors Oscillation blocking coils No. 2136—6/8 STK4171V Sample Application Circuit (protection circuit and muting circuit) Thermal Design IC Power dissipation, Pd - W IC Power dissipation, Pd - W The IC power dissipation of the STK4171V at the IC-operated mode is 61W max. at load resistance 8Ω and 86W max. at load resistance 4Ω (simultaneous drive of 2 channels) for continuous sine wave as shown in Figure 1 and 2. Output power, PO - W Figure 1. STK4171V Pd – PO (RL = 8Ω) Output power, PO - W Figure 2. STK4171V Pd – PO (RL = 4Ω) No. 2136—7/8 STK4171V In an actual application where a music signal is used, it is impractical to estimate the power dissipation based on the continuous signal as shown above, because too large a heat sink must be used. It is reasonable to estimate the power dissipation as 1/10 Po max. (EIAJ). That is, Pd = 38W at 8Ω, Pd = 49W at 4Ω Thermal resistance θc-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below. Condition 1: Tc = Pd × θc-a + Ta ≤ 125°C............................................... (1) where Ta : Specified ambient temperature Tc : Operating substrate temperature Condition 2: Tj= Pd × (θc-a) + Pd/4 × (θj-c) + Ta ≤ 150°C..................... (2) where Tj : Junction temperature of power transistor Assuming that the power dissipation is shared equally among the four power transistors (2 channels × 2), thermal resistance θj-c is 1.8°C/W and [Example] The thermal resistance of a heat sink is obtained when the ambient temperature specified for a stereo amplifier is 50°C. Assuming VCC = ±32.5V, RL = 8Ω, VCC = ±28V, RL = 4Ω, RL = 8Ω : Pd1 = 38W at 1/10 Po max. RL = 4Ω : Pd2 = 49W at 1/10 Po max. The thermal resistance of a heat sink is obtained from Figure 3. RL = 8Ω : θc-a1 = 1.97°C/W RL = 4Ω : θc-a2 = 1.53°C/W Tj when a heat sink is used is obtained from (3). RL = 8Ω : Tj = 141.9°C RL = 4Ω : Tj = 147°C ■ ■ Thermal resistance of heat sink, θc-a - °C/W Pd × (θc-a + 1.8/4) + Ta ≤ 150°C........................................ (3) Thermal resistance θc-a of a heat sink must satisfy inequalities (1) and (3). Figure 3 shows the relation between Pd and θc-a given from (1) and (3) with Ta as a parameter. IC Power dissipation, Pd - W Figure 3. STK4171V θc-a – Pd No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: ➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees, jointly or severally. ➀ ■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice. No. 2136—8/8