Ordering number : EN4376A Thick Film Hybrid IC STK4067 High-Output Power Amplifier for Car Stereos (Po = 60 W typ.) Overview Higher output amplification of the car stereo has been generally dependent on boosting voltage of the power supply. The STK4067 supports low-load impedance and is designed for up to 60 W of high output without the need for a power supply voltage booster circuit. Applications • Power amplifier for car stereos • Home karaoke systems • Radio-cassette players • Low operating power supply voltage range (9 V to 16 V) • Built-in muting circuit Short attack time with muting quickly enabled • Built-in protection circuits Built-in thermal shutdown and overvoltage protector Package Dimensions unit : mm 4131 [STK4067] Features • Superior heat sink capacity using IMST (insulated metal substrate technology) • Designed for high output while supporting low-load impedance ① RL = 1Ω 60 W typ. (EIAJ) 100 W (max.) ➁ RL = 2Ω 40 W typ. (EIAJ) 70 W (max.) 40 W (max.) ③ RL = 4Ω 23 W typ. (EIAJ) • Supports sufficient amplifier configurations for high power output • Low-load impedance driver Supports independent or parallel speaker connections for low-load impedance driving. • Low distortion THD = 0.025% typ. (V CC = 13.2 V, R L = 2Ω, Po = 10 W, f = 1 kHz) Compared with a monolithic IC, with a base frequency of 100 Hz, the following is established: secondary high frequency harmonics switches to –58 dB, with third-order switching to –20 dB, fourth-order to –45 dB, and fifth-order to –18 dB. • High temperature operation Provides guaranteed high output to the passenger compartments protected interior even when operating in excessive heat • Compact heat sink mounting Supports compact total-set packaging, occupying 1/3 the heat sink area compared of monolithic ICs, and equipped with an 85°C temperature range and 110°C guaranteed case temperature rating SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN D3096HA (OT)/31293YO 5-2987 No. 4376-1/8 STK4067 Specifications Maximum Ratings at Ta=25°C Parameter Symbol Maximum supply voltage Output current Junction temperature Ratings V VCC max (2) With signal (f = 100 kHZ, Vin = 1 Vrms, t = 100 ms) 18 V IO max 15 A Tj 150 °C θj-c Operating substrate temperature Tc Per power transistor Tstg Available time for load shorted Unit 30 Thermal resistance Storage temperature Conditions VCC max (1) No signal (with circuit cut off) 30s 1.6 °C/W 110 °C –40 to +125 °C VCC = 13.2 V, RL = 2 Ω, f = 50 Hz, PO = 25 W ts 2 s Recommended Operating Conditions at Ta=25°C Parameter Symbol Recommended supply voltage Conditions Ratings VCC Load resistance RL Unit 13.2 V 2 Ω Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 2 Ω, Rg = 600 Ω, VG = 46 dB Parameter Quiescent current Output power Total harmonic distortion Voltage gain Frequency response Input resistance Symbol ICCO Conditions PO (1) THD = 10%, f = 1 kHz, RL = 1 Ω PO (2) THD = 10%, f = 1 kHz, RL = 2 Ω THD (1) PO = 10 W, f =1kHz THD (2) PO = 1 W, f = 20 to 20 kHz VG fL, fL ri PO = 1 W, f = 1 kHz PO =1 W, PO = 1 W, f = 1 kHz VNO Output offset voltage ∆VN Rg = 10 kΩ Muting suppression level ATT VM = +5 V SVRR 50 max 140 60 0.025 43.8 46.0 –200 mA W 0.1 % 0.4 % 48.2 dB 20 to 30k 20 Unit W 40 Rg = 10 kΩ, BPF fR = 100 Hz, Rg = 0 Ω, VR = 0 dBm typ 70 +0 dB –3 Output noise voltage Ripple rejection min Rg = 10 kΩ Hz 30 kΩ 0.6 1.2 mVrms 0 +200 mV ∞ dB –47 dB Equivalent Circuit No. 4376-2/8 STK4067 STK4067 Design Data (1) The Protection Circuits a) Overvoltage Protector Since the STK4067 is designed for car stereo applications, VCC max for operating mode is set to 18 V. Exceeding the VCC maximum level activates the overvoltage protector and the circuit switches to an off-state and delivers no output. The overvoltage protection circuit is set for a functional range from 18 to 28 V; 100% operation at 28 V. For this reason, you should be careful not to exceed the 18 V limit in quiescent mode and keep in mind AC line regulations when setting using a transformer power supply for designs such as home stereo systems. Exceeding 18 V activates the overvoltage protector and results in the generation of abnormal sounds. b) Thermal Shutdown The thermal shutdown protection circuit is designed to first detect abnormal temperature rises which occur during abnormal operation (such as load shorts) and then prevent damage to the IC by limiting the input signal; thereby preventing a further rise in the temperature. The thermal shutdown protector is set to activate at substrate temperature of 135°C with a complete shutdown by switching to an off-state if temperatures rise to 175°C. Under normal application, the IC is equipped with a heat sink and the temperature never reaches a level resulting in a complete off-state switch and saturation occurs at a specific temperature. For example, when a short occurs with an IC mounted 4.5°C/W heat sink, saturation is achieved at approximately 160°C. At this point, Tj exceeds its maximum rating of 170°C. As previously mentioned, this circuit is designed to protect the IC from damage sustained in a short period of time and you should note that the protection circuit will not protect the IC if abnormal temperature rises occur over a long period of time. (2) Precautions a) Excessive Input If a 1 V or greater (f = 1 kHz.rms) overinput is applied to the input pin, the DC balance of the input channel for the input monolithic amplifier is disrupted and output is cut off. In addition, DC voltage is generated on the output pins and causes damage to the speakers. Proper caution should be displayed in preventing input above this voltage. b) Parasitic Oscillation The STK4067 performs phase compensation using 2.2Ω and 0.47µF between VCC and the bootstrap pins. Under such conditions, the power supply line must be in a close proximity to the bootstrap pins for the inverting and non-inverting amplifiers. If the power line is too long, parasitic oscillation is likely to occur at low temperatures. If such a problem arises, add a 0.1µF rated condenser between the ground and the head of the power supply line in order to lower the impedance. c) Power Supply Voltage Inverse Application The STK4067 is not equipped with a built-in power supply voltage inversion protection circuit. If the possibility exists, one should be externally connected. d) Power Off Do not connect pin 1 of the VCC pin directly to the ground or else the IC will be damaged. When connecting pin 1, install a resistor rated for 100Ω or greater in series with pin 1, or you may place a diode between pin 10 and pin 1. (3) Application Circuits a) The under frequency band may be magnified, for applications using a booster amplifier or woofer driver amplifier, the bootstrap condensers (C3 and C4) can be changed from 220µF to 470µF. Refer to PO-f graphs. b) L1 = 3 µH and R3 = 4.7Ω are for anti-oscillation applications against capacity loads. We recommend the use of this coil and resistor with the most compatible amplifier sets connected to general use speakers. This coil is not necessary when the load capacity is low using a chosen speaker connected to a radio-cassette player or active speaker. No. 4376-3/8 STK4067 Example PCB Sample Application Circuit No. 4376-4/8 STK4067 Sample STK4067 Heat Sink Design The radiator thermal resistance θc-a required for total substrate power dissipation Pd in the STK4067 is determined as: Condition 1: IC substrate temperature Tc not to exceed 110°C. Pd x θc-a+Ta <110°C ······························· (1) where Ta is set assured ambient temperature. Condition 2: Power transistor junction temperature Tj not to exceed 150°C. Pd x θc-a+Pd/N x θj-c+Ta<150°C·············(2) where N is the number of power transistors and θj-c is the thermal resistance per power transistor chip. However, power transistor power consumption is Pd equally divided by N units. Expressions (1) and (2) can be rewritten based on θc-a to yield: θc-a<(110–Ta)/Pd ······································(1)' θc-a<(150–Ta)/Pd–θj-c/N··························(2)' The required radiator thermal resistance will satisfy both of these expressions. From expressions (1)' and (2)', the required radiator thermal resistance can be determined once the following specifications are known: • • • Supply voltage VCC Load resistance RL Assured ambient temperature Ta The total substrate power consumption when STK4067 VCC is ±13.2 V and RL is 2 Ω, for a continuous sine wave signal, is a maximum of 19.3W (Fig. 2). The STK4067 has four power transistors, so the thermal resistance per transistor θj-c is 1.6°C / W. With an assured ambient temperature Ta of 50°C, the required radiator thermal resistance θc-a would be: From expression (1)' θc-a <(110–50)/19.3 <3.1 From expression (2)' θc-a <(150–50)/19.3–1.6/4 <4.78 To satisfy both, 3.1°C/W is the required radiator thermal resistance. Figure 1 illustrates Pd - PO when the VCC of STK4067 is 13.2V and RL is functioning at 1Ω. Pd max= 34.8W From expression (1)' θc-a <(110–50)/34.8 <1.72 From expression (2)' θc-a <(150-50)/34.8–1.6/4 <2.47 To satisfy both, 1.72°C/W is the required radiator thermal resistance. Similar to figure 3 when the STK4067’s VCC is 13.2 V and RL is 4Ω. Pd max= 12W From expression (1)' θc-a <(110–50)/12 <5 From expression (2)' θc-a <(150-50)/12–1.6/4 <7.93 To satisfy both, 5°C / W is the required radiator thermal resistance. This design example is based on a fixed voltage supply, and will require verification within your specific set environment. No. 4376-5/8 STK4067 No. 4376-6/8 STK4067 No. 4376-7/8 STK4067 ■ 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 December, 1996. Specifications and information herein are subject to change without notice. No. 4376-8/8