SANYO LA4628 Datasheet

Ordering number : ENN6632

Monolithic Linear IC

LA4628

Two-Channel 20 W BTL Audio Power Amplifier

Overview

The LA4628 is a 2-channel general-purpose BTL audio power amplifier provided in a miniature package. It was designed for the best possible audio quality and features an extended low band roll-off frequency provided by a newly-developed NF circuit that does not require an external capacitor. Furthermore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced by both circuit and wiring pattern improvements. Thus this amplifier can provide powerful lows and clear highs.

Note that this device is pin compatible with the 13.5 W × 2-channel LA4625, and allows end products differentiated by their power rating to share the same printed circuit board.

Features

•Total output: 20 W + 20 W (at VCC = 13.5 V, RL = 4 Ω , THD = 10%)

•High-fidelity design (fL < 10 Hz, fH = 130 kHz)

•Extremely low impulse noise levels

•An arbitrary amplifier startup time can be set up with external components.

•Full complement of built-in protection circuits (includes circuits that protect against shorting to VCC, shorting to ground, load shorting, overvoltages and excessive temperatures)

Package Dimensions

unit: mm

3113A-SIP14HZ
	[LA4628]
	27.0		4.0
	20.0
		R1.7	14.5max
8.4		11.8
7.8
		5.2	4.6
1	0.5	14
1.94			0.4
3.56			1.6
			2.2
1.78	3.56
		SANYO: SIP14HZ

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

92900RM (OT) No. 6632-1/8

LA4628

Allowable power dissipation, Pd max — W

				Pd max — Ta
35
30	θf=3°C/W						θjc=2.0°C/W
25	θf=4°C/W
20
15	θf=7°C/W
	θf=10°C/W
10
5	No Fin
0	0	20	40	60	80	100	120	140	160
–20

Ambient temperature, Ta —°C

Specifications

Maximum Ratings at Ta = 25°C

Parameter	Symbol	Conditions	Ratings	Unit
Maximum supply voltage	VCC max	No signal	24	V
Maximum output current	IO peak	Per channel	4	A
Allowable power dissipation	Pd max	With an arbitrarily large heat sink	32.5	W
Operating temperature	Topr		–20 to +85	°C
Storage temperature	Tstg		–40 to +150	°C

Operating Conditions at Ta = 25°C

Parameter	Symbol	Conditions	Ratings	Unit
Recommended supply voltage	VCC		13.5	V
Recommended load resistance range	RL op		4 to 8	Ω
Allowable operating supply voltage range	VCC op		9 to 20	V

Note: With VCC, RL, and the output level in ranges such that the Pdmax for the heat sink used is not exceeded.

Operating Characteristics at Ta = 25°C, VCC = 13.5 V, RL = 4 Ω , f = 1 kHz, Rg = 600 Ω

	Parameter	Symbol	Conditions		Ratings		Unit
				min	typ	max
	Quiescent current	ICCO	With Rg = 0 and RL open.	70	130	250	mA
	Standby mode current drain	Ist	Standby mode (amplifier off), with no power supply capacitor.		10	60	µA
	Voltage gain	VG	VO = 0 dBm	38	40	42	dB
	Total harmonic distortion	THD	PO = 1 W, Filter = FLAT		0.06	0.2	%
	Output power	PO1	VCC = 13.5 V, THD = 10%, RL = 4 Ω	16	20		W
		PO2	VCC = 16.5 V, THD = 10%, RL = 4 Ω		30		W
	Output offset voltage	VN offset	Rg = 0	–300		+300	mV
	Output noise voltage	VNO	Rg = 0, BPF = 20 Hz to 20 kHz		0.1	0.5	mV
	Ripple rejection ratio	SVRR	Rg = 0, VR = 0 dBm, fR = 100 Hz	40	50		dB
	Channel separation	CH Sep	Rg = 10 kΩ , VO = 0 dBm	50	60		dB
	Input resistance	Ri		21	30	39	kΩ
	Standby pin applied voltage	VST	Amplifier on (applied through an external 10 kΩ resistor)	2.5		VCC	V

No. 6632-2/8

LA4628

Equivalent Circuit Block Diagram

		C2
		100 /16 V									VCC
			+
										+	2200
									C5
											25 V
			2					14
		RIPPLE						OUTPUT PIN TO VCC
		FILTER						SHORT PROTECTOR
									13	–OUT1	–
	C1				PREDRIVER	POWER				C6 0.1
									**
	+ 1		+							R2
							LOAD SHORT	POWER	12		RL
			– IN							2.2	4 Ω
	2.2						PROTECTOR	GND1		R3
	10 V								**	2.2
										C7 0.1
					PREDRIVER	POWER			11
										+OUT1	+
	PRE GND	3	BIAS			OVER	VOLTAGE/	OUTPUT PIN TO GND
								SHORT PROTECTOR	**
			CIRCUIT			SURGE
	R1						VCC		(POLYESTER
									FILM
	ON 10 K	4	STANDBY			THERMAL
									CAPACITOR)
								OUTPUT PIN TO GND
OFF			SW			SHUT DOWN
								SHORT PROTECTOR
Standby
	+5 V									–OUT2	–
SW					PREDRIVER	POWER			9
	C4									C8 0.1
		IN2
	+								**	R4
		6	+				LOAD SHORT				RL
				IN				POWER	10	2.2
			–								4 Ω
	2.2						PROTECTOR	GND2		R5
										2.2
	10 V				PREDRIVER	POWER			8	C9 0.1
										+OUT2	+
								OUTPUT PIN TO VCC
		POP NOISE						SHORT PROTECTOR
		PREVENTION
		CIRCUIT
		+	5		7
					+
		33		C3	0.47	C10
		10 V			10 V

C3	C10
Sets the amplifier starting time	Impulse noise reduction
(Approximately 0.6 seconds when 33 µF)	(Note: The device’s ability to withstand shorting
	to VCC or shorting to ground when VCC is around
	16 V may be reduced as the value of this
	capacitor is increased. We recommend 0.47 µF.)

No. 6632-3/8