Ordering number: EN4611A Thick Film Hybrid IC STK4221II AF Power Amplifier (Split Power Supply) (80W + 80W min, THD = 0.4%) Features Package Dimensions • Built-in muting circuit to cut off various kinds of pop noise • Current mirror circuit application reduces distortion to 0.4% (THD) • The STK4201II series (THD=0.4%), STK4201V series (THD=0.08%), and STK4141X series (THD=0.02%) are pin-compatible. unit: mm 4086A [STK4221II] Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC max ±65 V θj-c 1.4 °C/W Junction temperature Tj 150 °C Operating substrate temperature Tc 125 °C −30 to +125 °C 1 s Maximum supply voltage Thermal resistance Storage temperature Tstg Available time for load short-circuit ts VCC = ±45V, RL = 8Ω, f = 50Hz, PO = 80W Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit Recommended supply voltage VCC ±45 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) / D2593YK 5-2297 No. 4611—1/5 STK4221II Operating Characteristics at Ta = 25°C, VCC = ±45V, RL = 8Ω, Rg = 600Ω, VG = 40dB, RL : non-inductive load Parameter Quiescent current Output power Symbol ICCO PO Conditions VCC = ±54V 20 THD = 0.4%, f = 20Hz to 20kHz 80 Total harmonic distortion THD PO = 1.0W, f = 1kHz Frequency response fL, fH PO = 1.0W, Input impedance ri PO = 1.0W, f = 1kHz VCC = ±54V, Rg = 10kΩ Neutral voltage VN VCC = ±54V Muting voltage VM Notes. typ 40 max Unit 100 mA W 0.3 +0 dB –3 VNO Output noise voltage min % 20 to 50k Hz 55 kΩ 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. For measurement of the available time for load short-circuit and output noise voltage, use the specified transformer power supply shown right. 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. 4611—2/5 STK4221II Sample Application Circuit : 80W min 2-channel AF power amplifier Sample Printed Circuit Pattern for Application Circuit (Cu-foiled side) No. 4611—3/5 STK4221II Description of External Parts 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 C13, C14 Capacitor for ripple filter • Capacitor for the TR10-used ripple filter in the IC system Oscillation blocking capacitor • A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C13, C14. 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 4.7kΩ + 4.7kΩ. It is recommended to use this resistor value. R15 Resistor for ripple filter • Limiting resistor for predriver TR at the time of load short R14 Used to ensure plus/minus balance at the time of clip. R18, R19 Resistor for ripple filter • When muting TR11 is turned ON, current flows from ground to -VCC through TR 11. 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 R16, R17 Output limiting resistors R22, R23 For high-frequency oscillation blocking L1, L2 For high-frequency oscillation blocking No. 4611—4/5 STK4221II Sample Application Circuit (protection circuit and muting circuit) ■ 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: ➀ 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. ■ 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. 4611—5/5