SANYO STK402-100

Two-Channel Class AB Audio Power Amplifier IC

60 W + 60 W

Overview

The STK402-000 series products are audio power amplifier hybrid ICs that consist of optimally-designed discrete component power amplifier circuits. These circuits have been miniaturized using SANYO's unique insulated metal substrate technology (IMST). SANYO has adopted a new low thermal resistance substrate in these products to reduce the package size by about 60% compared to the earlier SANYO STK407-000 series.

Features

Series of pin-compatible power amplifiers ranging from 20 W x 2 channels to 120 W x 2 channels (10%/1 kHz) devices. The same printed circuit board can be used depending on the output power grade.
The pin arrangement is compatible with that of the 3-channel STK402-200 series, allowing 3-channel printed circuit boards to be used for 2-channel products.
Miniature packages: 15 W/ch to 40 W/ch (THD = 0.4%, f = 20 Hz to 20 kHz) with dimensions 46.6 mm x 25.5 mm x 8.5 mm; 50 W/ch to 80 W/ch (THD = 0.4%, f = 20 Hz to 20 kHz) with dimensions 59.2 mm x 31.0 mm x 8.5 mm. (Dimensions exclude pins.)
Output load impedance: R_L = 6 Ω
Allowable load shorted time: 0.3 seconds
Supports the use of standby, muting, and load shorting protection circuits.

Package Dimensions

Unit: mm

Model: 4190-SIP15

Diagram Description: A diagram shows the STK402-100 package with pin numbers 1 through 15. Key dimensions are indicated: 59.2 mm length, 52.0 mm width, 31.0 mm height, 8.5 mm depth. Pin pitch is approximately 2.0 mm. The package is labeled "SANYO: SIP15".

Series Organization

These products are organized as a series based on their output capacity.

Type No.	Output 1 (10%/1 kHz)	Output 2 (0.4%/20 Hz to 20 kHz)	Maximum supply voltage (No signal)	Maximum supply voltage (6 Ω)	Recommended supply voltage (6 Ω)	Package
STK402-020	20 W + 20 W	15 W + 15 W	±30 V	±28 V	±19 V	46.6 mm x 25.5 mm x 8.5 mm
STK402-030	30 W + 30 W	20 W + 20 W	±34 V	±32 V	±22 V	46.6 mm x 25.5 mm x 8.5 mm
STK402-040	40 W + 40 W	25 W + 25 W	±38 V	±36 V	±25 V
STK402-050	45 W +45 W	30 W + 30 W	±40 V	±38 V	±26.5 V
STK402-070	60 W + 60 W	40 W + 40 W	±50 V	±44 V	±30 V	59.2 mm x 31.0 mm x 8.5 mm
STK402-090	80 W + 80 W	50 W + 50 W	±54 V	±47 V	±32 V	59.2 mm x 31.0 mm x 8.5 mm
STK402-100	100 W + 100 W	60 W + 60 W	±57 V	±50 V	±35 V
STK402-120	120 W + 120 W	80 W + 80 W	±65 V	±57 V	±39 V

Specifications

Maximum Ratings at Ta = 25°C

Parameter	Symbol	Conditions	Ratings	Unit
Maximum supply voltage (No signal)	V_CC max(0)		±57	V
Maximum supply voltage (6 Ω)	V_CC max(1)	R_L = 6 Ω	±50	V
Thermal resistance	θ_JC	Per power transistor	2.2	°C/W
Junction temperature	T_j max	Both the T_j max and T_c max conditions must be met.	150	°C
Operating IC substrate temperature	T_c max		125	°C
Storage temperature	T_stg		-30 to +125	°C

Operating Characteristics at Tc = 25°C, R_L = 6 Ω (noninductive load), R_g = 600 Ω, V_G = 30 dB

Parameter	Symbol	V_CC (V)	f (Hz)	Conditions*1	Ratings	Unit
				P_O (W)	THD (%)	min	typ	max
Output power	P_O (1)	±35.0	20 to 20 k	0.4		57	60		W
	P_O (2)	±37.0	1 k		10		100		W
Total harmonic distortion	THD (1)	±35.0	20 to 20 k		1.0		0.4		%
	THD (2)	±35.0	1 k		5.0		0.01		%
Frequency characteristics	f_L, f_H	±35.0			1.0			20 to 50 k	Hz
Input impedance	r_i	±35.0	1 k		1.0		55		kΩ
Output noise voltage *3	V_NO	±42.0		R_g = 2.2 kΩ		1.2		mV_rms
Quiescent current	I_CCO	±42.0				10	40	80	mA
Neutral voltage	V_N	±42.0				-70	0	+70	mV

Notes:

1. Unless otherwise noted, use a constant-voltage supply for the power supply used during inspection.
2. Use the transformer power supply circuit stipulated in the figure below for allowable load shorted time measurement and output noise voltage measurement.

Stipulated Transformer Power Supply (MG-200 equivalent) Diagram Description: A circuit diagram shows a transformer with primary and secondary windings. The secondary is connected to two filter capacitors (10000 μF each) and two resistors (500 Ω each) to create positive (+VCC) and negative (-VCC) power supply rails. The diagram is labeled "DBA40C".

3. The output noise voltage values shown are peak values read with a VTVM. However, an AC stabilized (50 Hz) power supply should be used to minimize the influence of AC primary side flicker noise on the reading.

Circuit Diagrams

Internal Equivalent Circuit

Diagram Description: A detailed schematic shows the internal transistor and resistor network of the STK402-100, illustrating the Class AB amplifier stages. Components are labeled with R and TR numbers, and pin connections (1-15) are indicated.

Sample Application Circuit

Diagram Description: A practical application circuit diagram is provided, showing how to connect the STK402-100 IC for a two-channel audio amplifier. It includes input and output stages, feedback networks (NF), power supply connections (+VCC, -VCC, +VE, -VE), bias circuits, and external components like capacitors (e.g., 2.2µF, 220pF, 470pF, 3pF, 0.1µF), resistors (e.g., 56kΩ, 1.8kΩ, 10kΩ, 0.22Ω, 1kΩ, 100Ω, 4.7Ω), and inductors (3μH). The circuit is shown for both Channel 1 (Ch.1) and Channel 2 (Ch.2).

Thermal Design Example

The thermal resistance, θ_JC-a, of the required heat sink for the power dissipation, P_d, within the hybrid IC is determined as follows.

Condition 1: IC Substrate Temperature

The IC substrate temperature, T_c, must not exceed 125°C.

Formula: P_d × θ_JC-a + T_a < 125°C (1)

Where T_a is the guaranteed ambient temperature for the end product.

Condition 2: Junction Temperature

The junction temperature, T_j, of each power transistor must not exceed 150°C.

Formula: P_d × θ_JC-a + P_d/N × θ_j-c + T_a < 150°C (2)

Where N is the number of power transistors and θ_j-c is the thermal resistance per power transistor.

The power dissipation, P_d, for the power transistors is allocated equally among the N transistors. The following inequalities result from solving equations (1) and (2) for θ_JC-a:

θ_JC-a < (125 – T_a) / P_d (1)'

θ_JC-a < (150 – T_a) / P_d – θ_j-c/N (2)'

Values that satisfy both inequalities represent the required heat sink thermal resistance.

Example Calculation

Given specifications: Supply voltage V_CC = ±35 V, Load resistance R_L = 6 Ω. The IC internal power dissipation, P_d, is a maximum of 87 W for a continuous sine wave signal at 1 kHz. For typical music signals, P_d is estimated as 1/8 of P_O max (e.g., 7.5 W).

Assuming P_d = 60 W. The number of power transistors (N) = 4. Thermal resistance per transistor (θ_j-c) = 2.2°C/W.

For a guaranteed ambient temperature T_a = 50°C:

From formula (1)': θ_JC-a < (125 – 50) / 60 = 1.25 °C/W

From formula (2)': θ_JC-a < (150 – 50) / 60 – 2.2/4 = 1.11 °C/W

Therefore, the required heat sink thermal resistance is 1.11°C/W.

Note: This example assumes a constant-voltage power supply and is not a verified design for specific end products.

Performance Graphs

Pd - Po Graph

Graph Description: A line graph titled "Total device power dissipation Pd - W" versus "Output power, PO / ch - W". The graph shows power dissipation increasing with output power. Conditions specified are R_L = 6 Ω, f = 1 kHz, R_g = 600 Ω, 2ch drive, V_CC = ±35V.

THD - Po Graph

Graph Description: A line graph titled "Total harmonic distortion, THD - %" versus "Output power, PO - W". Multiple lines represent different frequencies (20 kHz, 1 kHz). Conditions specified are T_C = 25 °C, V_CC = ±35 V, V_G = 30 dB, R_L = 6 Ω, R_g = 600 Ω.

Important Disclaimers

Specifications provided herein are for products in their independent state and do not guarantee performance in customer equipment. Customers should evaluate and test devices in their specific applications.

SANYO Electric Co., Ltd. strives for high-quality, high-reliability products. However, semiconductor products have a probability of failure, which could lead to accidents, fires, or property damage. Implement safety measures, including protective circuits and error prevention, for safe design, redundant design, and structural design.

Products described herein are subject to export control laws. Exporting these products requires obtaining an export license from the relevant authorities.

Reproduction or transmission of this publication in any form or by any means requires prior written permission from SANYO Electric Co., Ltd.

Information is subject to change without notice due to product/technology improvements. Refer to the "Delivery Specification" for the intended SANYO product.

Circuit diagrams and parameters are for example only and not guaranteed for volume production. SANYO believes information is accurate but makes no guarantees regarding its use or infringement of third-party rights.

This catalog provides information as of December 2002. Specifications and information are subject to change without notice.

Manufacturer: SANYO Electric Co., Ltd. Semiconductor Company, TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN.

Ordering Number: ENN7066A

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