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Ordering number: EN2885A
Thick Film Hybrid IC
STK4432 AF Power Amplifier (25W + 25W min, THD = 1.0%)
Features
* Small and slim package with 31 mm height * Pin compatible with STK430 series heretofore in use * Greatly reduced heat sink due to case temperature 125C guaranteed * Excellent cost performance
Package Dimensions
unit: mm
4033
[STK4432]
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Operating substrate temperature Storage temperature Available time for load short-circuit Symbol VCC max Tc Tstg ts VCC = 49V, RL = 8, f = 50Hz, Po = 25W Conditions Ratings 70 125 -30 to +125 2 Unit V C C s
Recommended Operating Conditions at Ta = 25C
Parameter Recommended operating voltage Load resistance Symbol VCC RL Conditions Ratings 49 8 Unit V
Operating Characteristics at Ta = 25C, VCC = 49V, RL = 8, Rg = 600, VG = 40dB
Parameter Quiescent current Output power Po (2) Total harmonic distortion Frequency response Input impedance Output noise voltage THD fL, fH ri VNO Symbol Icco Po (1) Conditions VCC = 58V THD = 1.0%, f = 1kHz THD = 1.0%, f = 30Hz to 20kHz Po = 0.1W, f = 1kHz +0 Po = 0.1W, dB -3 Po = 0.1W, f = 1kHz VCC = 58V, Rg = 10k 20 to 100k 110 0.8 min 20 25 13 0.3 typ 60 max 120 Unit mA W W % Hz k mVrms
SANYO Electric Co., Ltd. Semiconductor Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
110297HA (ID) / 9088TA, TS No. 2885--1/7
STK4432
Notes.
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 RP-25)
Equivalent Circuit
Sample Application Circuit: 25W min 2-Channel AF Power Amplifier
No. 2885--2/7
STK4432
Sample Printed Circuit Pattern for Application Circuit (Cu-foiled side)
Input voltage, Vi - mV
Total harmonic distortion, THD - %
Output power, Po - W
Output power, Po - W
Output power, Po - W
Frequency, f - Hz
Voltage gain, VG - dB
Frequency, f - Hz
No. 2885--3/7
Voltage gain, VG - dB
Current drain, ICC - A
Quiescent current, Icco - mA
Operating substrate temperature, Tc - C
Supply voltage, VCC - V
Frequency, f - Hz Output power, Po - W IC Power dissipation, Pd - W Quiescent current, Icco - mA Supply voltage, VCC - V Output power, Po - W
STK4432
No. 2885--4/7
STK4432
Description of External Parts
C1, C2
Input filter capacitors * A filter formed with R1 or R2 can be used to reduce noise at high frequencies. 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. NF capacitors * These capacitors fix the low cutoff frequency shown below.
C3, C4
C5, C6
1 f L = ---------------------------------- Hz 2 C5 R3 To provide the desired voltage gain at low frequencies, it is better to increase C5. However, do not increase C5 more than needed because the pop noise level becomes higher at the time of application of power. Capacitor for ripple filter * Used to eliminate the ripple components that mix into the input side from the power line (+VCC). Front stage bias resistors Front stage bias resistor Oscillation blocking capacitors * A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C9, C10. Resistors for input filter Front stage bias resistor These resistors fix voltage gain VG. It is recommended to use R3 (R4) = 12 for VG = 40dB. * To adjust VG, it is desirable to change R3 (or R4). Bootstrap capacitors * When the capacitor value is decreased, the distortion is liable to be higher at low frequencies. Resistor for ripple filter (Limiting resistor for predriver TR at the time of load short) Output capacitors * These capacitors fix the low cutoff frequency. Oscillation blocking capacitor * 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. Decoupling capacitor * When the capacitor value is increased, the starting time is made longer. Oscillation blocking resistors
C15 R7, R8 R11 C9, C10 R1, R2 R12 R3, R5 (R4, R6) C7, C8 R13 C11, C12 C13 C14 R9, R10
No. 2885--5/7
STK4432
Sample Application Circuit (protection circuit and muting circuit)
Thermal Design
The IC power dissipation of the STK4432 at the IC-operated mode is 30W max. at load resistance 8 (simultaneous drive of 2 channels) for continuous sine wave as shown in Figure 1. 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 right, 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 = 21.5W at 8 Thermal resistance c-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below.
IC Power dissipation, Pd - W
Output power, Po - W
Figure 1. STK4432 Pd - Po (RL = 8)
Condition 1: TC = Pd x c-a + Ta 125C .............................................. (1) where Ta : Specified ambient temperature TC : Operating substrate temperature Condition 2: Tj = Pd x (c-a) + Pd/4 x (j-c) + Ta 150C .................... (2) where Tj : Junction temperature of power transistor Assuming that the power dissipation is shared equally among the four power transistors(2 channels x 2), thermal resistance j-c is 2.8C/W and Pd x (c-a + 2.8/4) + Ta 150C........................................ (3)
No. 2885--6/7
STK4432 Thermal resistance c-a of a heat sink must satisfy inequalities (1) and (3). Figure 2 shows the relation between Pd and c-a given from (1) and (3) with Ta as a parameter. [Example] The thermal resistance of a heat sink is obtained when the ambient temperature specified for a stereo amplifier is 50C. Assuming VCC = 49V, RL = 8, RL = 8 : Pd = 21.5W at 1/10 Po max. The thermal resistance of a heat sink is obtained from Figure 2. RL = 8 : c-a = 3.49C/W Tj when a heat sink is used is obtained from (3). RL = 8 : Tj = 140.1C
Thermal resistance of heat sink, c-a - C/W
IC Power dissipation, Pd - W
Figure 2. STK4432 c-a - Pd
s
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: 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.
s
s
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 November, 1997. Specifications and information herein are subject to change without notice.
No. 2885--7/7

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