Gre} LOW VOLTAGE AUDIO POWER AMPLIFIER NJM386B The NJM386B is wider operating voltage and higher output power version of NJM386. The maximum operating voltage is I8V. and the maximum output power is up to 1W. ws Package Outline = Absolute Maximum Ratings (Ta=25C) Wnceeet Supply Voltage yr 22V Power dissipation PD(D-Type) 700mW (L-Type) 800mW (M-Type) 300mW Input Voltage Range Vin 0.4V Operating Temperature Range Tope 20~+75C Storage Tamperature Range Tug 40~ +125 = Features = Applications + Minimun external parts - AM-FM radio amplifiers * Wide Supply voltage range 4~18V - Portable tape player amplifiers + Low quiescent current drain 5mA - Intercoms + Voltage Gain 20~200 - TV sound systems + Single supply operation - Line drivers + Self-centering of output offset voltage - Ultrasonic Drivers - Small servo drivers - Power converters @ Equivalent Circuit @ Connection Diagram gy. D.M-Type 3 a (Top View) 7 9 PIN FUNCTION BY PASS O-} 1 { q 1. GAIN Sim GAIN GAIN 2. -INPUT < 8 1 Cy 3. +INPUT 4. GND OUTPUT Cc 5. OUTPUT 6. Vt > 7. BY PASS Cc 8. GAIN 4 4 GND L-Type 7-10 New Japan Radio Co.Ltd. m= Electrical Characteristics (Ta=25C) NJM386B Parameter Symbol Test Condition Min. | Typ. | Max. | Unit Operating Supply Voltage vr 4 _ 18 v Supply Current Ice Vt=6V, Vin=0 _ 5 8 mA Output Power Po Vt=6V, Rt =80, THD= 10% 250 325 | mw V*=9V, Ri =80, THD=10% (note 2) 500 | 850 | mW V+=16V, Ry =320, THD= 10% (note 1) 700 {1000 | mw Voltage Gain Ay Vs=6V, f=1kHz 24 26 28 | dB lOzF from Pin | to 8 43 46 49 | dB Bandwidth BW V+=6V, Pins | and 8 Open 600 | kHz Tota! Harmonic Distortion THD V+=6V, Ri =80, Pout=125mV _ 0.1 |% f=1kHz, Pins | and 8 Open Power supply Rejection Rratio SVR V+=6V, f=1kHz, Caypass=10uF _ 50 | dB Pins | and 8 Open Input Resistance Rin _ 50 | ka Input.Bias Current Ip V+=6V, Pins 2 and 3 Open _ 100 _ nA (note 1) NJM386BM: At on Board (note 2) NJM386BS: At on Board 8 Typical Application INPUT INPUT . |, s Power Dissipation vs. Ambient Temperature Power Dissipation ~~ (mW) -25 0 125C/W M4yec' Ww 25 50 15 Ambient Temperature Ta (C) New Japan Radio Co.Ltd. 7-11 NJM386B Notice when Application Prevention of Oscillation It is recommended to insert capacitors at around the supply source and the GND pins with the value of 0.14F and more than !00uF which are featuring higher frequency efficiency. When the speaker load condition, it is recommendable to insert the resisitor of 10Q and the capacitor of 0.047,4,F between the output and the GND pins. How to use the Input Resistor (TYP. 50kQ) The input resistors have much deviation in value generally, so that it is recommended not to use them as the constant of the circuit. The countermeasure to be recommended is to apply the resistor of higher in value, which is so higher to be able to ignore the input deviation (3kQ approximately) in parallel application. Signal = *-- TY P50kQ Maintenance of Output Offset Voltage By making connection of both input pins with low value (below 10kQ approximately) to GND, the output offset voltage is automatically set in the medium range value of the supply source. However, the DC Gain of NJM386 is approximately at 20 times in value, so that when keeping one side input pin open, and the other side to GND on DC condition. The voltage drop caused by input resistor < input bias current, that is, (input resistor X input bias current) 20 times voltage is to be sheared, which in the result, no distortion output Oscillation range shall be decreeased. In regard to dealing with the input pin, it is recommendable to put the input pin into the GND at first, and the other side of signal input pin, to be connected into GND with the resisitor of less than about 10kQ on DC condition. * The Application Purpose and Recommended Value of the External Parts. Oe Application purpose Recominened Remarks Rs Current like noise reduction Below 10k The noise becomes high when the input pin opend. Vog stabilization CIN Vog stabilization luF Ic is not required in case when there is no DC offset in the input signal. Cri V* stabilization = Coup it can be decreased in value when the output impedance source is low. Cpz Oscitallation prevention O.LaeF Insert near around the supply source and GND pins. Cv Ripple rejection to Vo by way of | 472 F It is not required when the V* is stabilized. ve *Co Oscillation preventon 0.047 2 F To be decided in value according to load condition. *Ro Oscillation prevention 102 To be decided in value according to load condition. Ccup Output DC decoupling 470, F when Low band cutoff frequency (fi ) shall be decided by Ccup RL. Ri =40 When Ccurp is less in value, fi is to be increassed. 2204 F when Ru =80 NJM386B Recommended Circuit 7-12 NJM3868 @ Typical Characteristics Supply Current a A 3 Supply Current a 5 (mA) Supply Current vs. Temperature 125 (Vt=6V) 9 8 7 6 5 4 3 2 1 0 50 -2 oO 2 50 75 4100 Ambient Temperature Ta (C) Supply Current vs. Supply Voltage (Ta=25C) 10 Le ; ny %O 10 15 Supply Voltage V* (V) Total Harmonic Distortion vs. Output Power {V+ =6V, RL=8Q, f=1kHz, Ta=25C) 10 ce 8 Cc g ai 2 5 05 E = 3 3 E THD * (%) 0.1 Output Power Po (W) 20 a > Voltage Gain Maximum Output Voltage Swing 1 < Zz {V) New Japan Radio Co,Lid. Voltage Gain vs. Temperature (V*= 6 V, 26dB Application ) 31 30 29 28 27 26 24 23 22 50 25 0 25 50 75 100 125 Ambient Temperatre Ta (C) Maximum Output Voltage Swing vs. Supply Voitage (Standard Application | Ta=25C) RL=0 R, =322 Ri =32Q R, =00 6 8 12 14 16 18 Supply Voltage fv) 7-13 NJM3868B @ Typical Characteristics Power Dissipation vs. Output Power Power Dissipation vs. Output Power (RL=4Q, Ta=25C) (Ri=8Q, Ta=25C) Lo 0.9 0.8 5 & 0.7 & . 2 A 0.6 A 05 3 ae 3% THD LEVEL e 04 10% THD LEVEL Po Pp : {| 0.3 THD (w) (Ww) 0 0.1 0 Output Power Po (W) Output Power Po (W) Power Dissipation vs. Output Power Power Dissipation vs. Output Power (RL=16Q, Ta=25C) (Ri=322, Ta=25C) 1.0 8 8 B a B % a a o - 3 zg a 10 THD a Pp 3, THD LEVEL Pp . (w) (Ww) 10% THD LEVEL 3% THD LEVEL Output Power Po (W) Qutput Power Po (W) 7-14 Ness Jepoan Radio Co.Ltd.