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Monolithic Linear IC
Car Stereo 17 W
LA4705NA
Overview
The LA4705NA is a
The low band frequency characteristics were extended with a new
The LA4705NA also features a full complement of protection circuits and a standby mode switch.
Functions
■Total output: 25 W + 25 W (VCC = 14.4 V, THD = 30%, RL = 4Ω )
■Supports loads as low as RL = 2 Ω
■Superb sound quality design (fL < 10 Hz, fH = 130 kHz)
■Noise filter circuit does not require capacitors
■The
■Extremely low levels of impulse noise
■
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◆Output
◆Output
◆Load short
◆Overvoltage
◆Thermal shutdown
■Package: SIP18H
Block Diagram |
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| 100∝F/16V |
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| + |
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| VCC |
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| NC |
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| VCC1 |
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| 3 |
| 1 |
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| 2200∝F | ||||
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| 18 |
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| RIPPLE |
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| OUTPUT PIN TO VCC |
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| FILTER |
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| SHORT PROTECTOR |
| INVERTING |
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| IN1 |
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| PREDRIVER | POWER |
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| 17 | OUT1 |
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| ∝ |
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| + | 2 |
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| ** | 0.1 F | + |
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| + |
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| LOAD SHORT | POWER | 2.2Ω | RL |
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| 2.2∝F/ |
| IN |
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| 16 |
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| - |
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| PROTECTOR | GND1 |
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| Ω | ||||
| 6.3V |
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| 15** | 2.2Ω | - | 2 to 4 | |||
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| PREDRIVER | POWER |
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| 0.1∝F |
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| PRE GND |
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| 4 |
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| BIAS |
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| OUTPUT | ** | OUT1 |
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| CIRCUIT |
| OVER VOLTAGE/ | VCC SHORT PROTECTOR |
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AMP |
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| SURGE PROTECTOR |
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| POLYESTER FILM |
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10KΩ |
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| THERMAL |
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| CAPACITOR |
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OFF ON | 5 | STANDBY |
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| OUTPUT |
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| SHUTDOWN |
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| SW |
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| SHORT PROTECTOR |
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+5V |
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| 14 | OUT2 |
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| PREDRIVER | POWER |
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| IN2 |
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| 0.1∝F | + |
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| + | 7 |
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| LOAD SHORT | POWER | ** | 2.2Ω | RL |
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| 2.2∝F/ |
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| - IN |
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| PROTECTOR | GND2 | 13 | 2.2Ω | - | 2 to 4Ω | |||
| 6.3V |
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| ** |
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| PREDRIVER | POWER |
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| 0.1∝F |
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| POP NOISE |
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| 12 | INVERTING |
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| OUTPUT PIN TO VCC |
| OUT2 |
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| PREVENTION |
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| CIRCUIT |
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| SHORT PROTECTOR |
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| 6 | 8 | 9 | 10 |
| 11 |
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| + | + | NC | NC |
| VCC2 |
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| 33∝F/ |
| 0.47∝F/ |
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1,9,10 Pin······Non connect6.3V |
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| 6.3V |
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Monolithic Linear ICIC
Car Stereo 20 WW
LA4708NF8
Overview
The LA4708NF is
The low band frequency characteristics were extended with a new
The LA4708NF also features a full complement of protection circuits and a standby mode switch.
Note that the LA4708NF is pin compatible with the LA4705NA (car stereo 17 W
(Pins 1 and 9 must be left open to allow the same circuit board to be used.)
Functions
■High power with a total output of 30 W + 30 W (VCC = 13.2 V, THD = 30%, RL = 4 Ω )
■Supports loads as low as RL = 2 Ω (VCC = 13.2 V, THD = 30%, PO = 30 W)
■Superb sound quality design (fL < 10 Hz, fH = 130 kHz)
■Noise filter circuit does not require capacitors
■The
■Extremely low levels of impulse noise
■
■
◆Output
◆Output
◆Load short
◆Overvoltage
◆Thermal shutdown
■Package: SIP18H
Block Diagram |
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| 100∝F/16V |
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| + |
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| VCC | |
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| C2 |
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| + |
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| 3 |
| 1 |
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| 18 |
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| C5 |
| 2200∝F | ||||
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| RIPPLE |
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| OUTPUT PIN TO VCC |
| INVERTING |
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| FILTER |
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| SHORT PROTECTOR |
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| C1 |
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| PREDRIVER | POWER |
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| 17 | OUT1 |
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| 0.1∝F |
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| IN1 |
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| ** | C6 |
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| + | 2 | + |
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| + |
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| LOAD SHORT | POWER | 2.2Ω | RL |
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| IN |
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| 16 | R2 |
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| ∝ |
| - |
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| PROTECTOR | GND1 | 2.2Ω |
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| 2.2 F/ |
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| R3 | - | 2 to 4 | ||||
| 6.3V |
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| ** |
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| PREDRIVER | POWER |
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| C70.1∝F |
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| PRE GND |
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| 15 |
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| 4 |
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| BIAS |
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| OUTPUT | ** | OUT1 |
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| CIRCUIT |
| OVER VOLTAGE/ | VCC SHORT PROTECTOR |
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AMP | R1 |
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| SURGE PROTECTOR |
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| POLYESTER FILM |
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| THERMAL |
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| CAPACITOR |
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OFF ON | 10KΩ |
| STANDBY |
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5 |
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| OUTPUT |
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| SHUTDOWN |
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| SW |
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| SHORT PROTECTOR |
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+5V |
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| 14 | OUT2 |
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| C4 |
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| PREDRIVER | POWER |
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| 0.1∝F |
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| IN2 |
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| ** | C8 |
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| + | 7 | + |
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| + |
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| LOAD SHORT | POWER | 2.2Ω | RL |
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| 13 | R4 |
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| 2.2∝F/ |
| - IN |
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| PROTECTOR | GND2 | 2.2Ω | - | 2 to 4Ω | |||||
| 6.3V |
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| ** | R5 |
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| PREDRIVER | POWER |
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| C90.1∝F |
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| POP NOISE |
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| 12 | INVERTING |
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| OUTPUT PIN TO VCC |
| OUT2 |
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| PREVENTION |
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| CIRCUIT |
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| SHORT PROTECTOR |
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| 6 | 8 | 9 | 10 |
| 11 |
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1,9 Pin······Don' t use | ∝ | + | ∝ + |
| N.C |
| VCC2 |
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10 Pin······Non connect | 33 F/ |
| C3 | 0.47 F/ |
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6.3V |
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| 6.3V |
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| 57 Car Audio | 58 Car Audio |
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