AN7077Z
Power supply and boost IC for class-H power amplifier
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Overview
A BTL 50 W × 2-channel (maximum. 75 W × 2- channel) class-H power amplifier can be made up by com- bining the power supply boost amplifier AN7077Z and the single power supply BTL audio power amplifier AN7194Z, and it is possible to make a low consumption power system.
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Features
•Incorporating various protection circuits
•Built-in standby circuit
•Peak detection circuit : Limits class-H operation at high frequency
•Built-in timer circuit
If a current larger than allowable value continues to flow into the power supply transformer, this circuit stops the class-H operation to prevent the transformer from dam- age by a fire.
•Built-in mute function
•Built-in LED driver
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Applications
•Miniature audio component, CD player radio cassette, karaoke and other audio equipment
HZIP015-P-0745A
Unit : mm
18.00±0.30 13.50±0.30
φ3.60±0.10
10.0±0.30
1 15
4.00±0.20 1.50±0.10
0.50+0.20−0.10 (0.61)
(2.54) 0.25+0.15−0.05 R0.55
3.25±0.10
13.25±0.30 18.95±0.5015.65±0.50
1.27
(1.80) (1.95)
19.00±0.30 19.30±0.30
2.40±0.50
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Block Diagram
Pin No. Description
1 Power supply
2 N.C.
3 Timer current setting 4 Current detection
5 Timer
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Pin Descriptions
VCCH
Mute
LED driver
Peek det.
Level shift 1 VBE
Class-H mute
Level shift 4 VBE
ASO
Constant current 24 V clamp
IOUT det.
1
15
9
4
2
3 12
6
8
11
13 VIN
14
5
7 GND
STB10
VRF = 6 V
VRF
15 µA5 µA
0.3 V 6 V
10 kΩ
Pin No. Description
9 NF
10 Standby
11 Muting
12 LED
13 Ripple filter
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Electrical Characteristics at V
CCH=24.0 V, V
CCL=12 V, frep.
=1 kHz, T
a=25
°C
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Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage *2 VCC 34 V
Supply current ICC 9.0 A
Power dissipation *3 PD 68.2 W
Operating ambient temperature *1 Topr −25 to +75 °C
Storage temperature *1 Tstg −55 to +150 °C
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Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage VCC 10.0 to 28.0 V
Parameter Symbol Conditions Min Typ Max Unit
Quiescent current ICQ VIN= open 25 50 mA
Standby current ISTB VIN= open 1 10 µA
Output offset voltage 1 VOFF1 VIN= 8 V, RL= 4 Ω 2.0 2.5 3.0 V
Output offset voltage 2 VOFF2 VIN= 16 V, RL= 4 Ω 2.5 3.0 3.5 V
Output current IOUT VIN= 14 V, RL= 2 Ω 7.0 8.0 A
Voltage gain GV VIN= 3 Vrms (DC 15 V), RL= 4 Ω −1.0 0.0 1.0 dB
Pin 4 output current IDET IOUT= 2 A 150 190 230 µA
Pin 5 output current 1 ITI1 Pin 4 = high, pin 5 =3 V 13 15 17 µA Pin 5 output current 2 ITI2 Pin 4 = low, pin 5 = 3 V 4.5 5 5.5 µA LED output current ILED VIN= 1 Vrms (DC 16 V), VLED= 8 V 15 30 mA Standby terminal current ICQ-STB VIN= open, VSTB= 5 V 500 650 800 µA Note) *1 : Ta = 25°C except operating ambient temperature and storage temperature.
*2 : Without input signals (output current 0 mA).
*3 : The value when Rth(j-c) = 1.1°C/W, Ta = 75°C.
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Usage Notes
1. Always attach an outside heat sink to use the chip. In addition, the outside heat sink must be fastened onto a chassis for use.
2. Connect the radiation fin to GND potential.
3. Avoid short circuit to VCC and short circuit to GND, and load short-circuit
4. The thermal protection circuit will be actuated at TJ = approx. 145°C, but it is automatically reset when the chip temperature drops below the above set level.
5. The overvoltage protection circuit starts its operation at VCC = approx. 36 V.
6. The protection circuit between VCC and the output starts its operation when the VCC − output voltage = approx. 18 V.
7. For the standby voltage, use a stabilized power supply of 3 V or more.
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Technical Information
•PD TA curves of HZIP015-P-0745A
PD TA
0 0 20 40 60 80 100 120
25 50 75
Ambient temperature Ta(°C) Allowable power dissipation PD (W)
100 125 150
Without heat sink 10°C/W heat sink 5°C/W heat sink 3°C/W heat sink 2°C/W heat sink 1°C/W heat sink
Infinite heat sink Rth(j-c) = 1.1°C/W Rth(j-a) = 68.3°C/W 113.6
59.5
40.3
30.5 20.5
11.3 1.8
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Application Circuit Example
12
6
8
11
13
12
4
2
10
3 5 6 11 7 10 14
7 5 14
8 9
1
15 9
4
3
1
13
15 100 s
35 s 0.3 V 5.5 V Off On Off
Mute On Active high
0.1 µF
VCCH 24 V
VCCL 12 V
1 000 µF 1 000 µF
2.2 µF
AC
100 kΩ4.7 kΩ 2.2 Ω
2.2 Ω 0.1 µF
100 µF 0.33 µF
0.22 µF 2.2 Ω
0.22 µF 20 kΩ
4.7 kΩ
56 kΩ 10 kΩ 10 kΩ
2.2 Ω 0.22 µF
2.2 Ω 0.22 µF 10 µF 10 µF
5 V ± 0.5 V VTH = 3.5 V 5 V ± 0.5 V VTH = 2.8 V
STBSTB MuteVIN1 VIN2
100 µF
1 500 pF
AN7077Z
AN7194Z
