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ML1469
_______________________________________________________________ ML1469 4-channel BTL driver for CD players Application
CD player VCD player DVD player
Features
Built in 3.3V (V33) or 5.0V (V50) V oltage regulator Built in general purpose operational amplifier Built in thermal shutdown circuit Few external parts PackageAvailable : HSOP28
General Description
The ML1469 is a 4-channel BTL driver for CD player motors and actuators. An internal 3.3V or 5.0V voltage regulator and general purpose op-amp are provided for variety of applications.
Block Diagram
ch4-OUTA ch3-OUTB SUBGND ch3-OUTA ch4-OUTB ch4-INA BIAS IN ch4-INB ch3-INB ch3-INA OP IN(+) OP IN(-) 15 + 14 OP-OUT Vcc Vcc 21 Vcc + 13k Level Shiff Vcc 1k
28
27 D.BUF
26 D.BUF
25 10k
24 1k
23
22
20 10k
19
18 D.BUF
17 D.BUF 12 ch2-OUTA
16
+ Level Shiff 13k + T.S.D 10k +
50k 50k
Driver-Mute
10k (3.3k) + + 13k Level Shiff
Level Shiff
13k
-
D.BUF
D.BUF
10k 2 ch1-OUTB 3 ch1- INA 4 ch1-INB
1k 5 Tr-B 6 Vreg OUT 7 MUTE 8 GND
1k 9 ch2-INB
10k 10 ch2-INA
1 ch1-OUTA
D.BUF
11 ch2-OUTB
D.BUF
13 SUBGND
T.S.D : Thermal Shutdown Circuit D.Buf : Drive Buffer
BTL Driver for CD Player 1/5
May, 2004 V1.3
ML1469
_______________________________________________________________ Pin Configuration
ch4-OUTA SUBGND ch4-OUTB ch3-OUTA ch3-OUTB OP IN(+) ch4-INA ch3-INB ch4-INB ch3-INA BIAS IN OP IN(-) 15 14 OP-OUT
Vcc
28
27
26
25
24
23
22
Vcc 21
20
19
18
17
16
ML1469
1 ch1-OUTA
2 ch1-OUTB
3 ch1- INA
4 ch1-INB
5 Tr-B
6 Vreg OUT
7 MUTE
8 GND
9 ch2-INB
10 ch2-INA
11 ch2-OUTB
12 ch2-OUTA
13 SUBGND
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name ch1-OUTA ch1-OUTB ch1-INA ch1-INB Tr-B Vreg OUT MUTE GND ch2-INB ch2-INA ch2-OUTB ch2-OUTA SUBGND OP OUT Function Driver channel 1 negative output Driver channel 1 positive output Driver channel 1 input Driver channel 1 input, gain adjustment Connect to external transistor base Regulated voltage output (5.0V or 3.3V) Driver mute control input Ground Driver channel 2 input, gain adjustment Driver channel 2 input Driver channel 2 positive output Driver channel 2 negative output Substrate ground Operational amplifier output Pin 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin Name OP IN (-) OP IN (+) ch3-OUTA ch3-OUTB ch3-INA ch3-INB Vcc Vcc BIAS IN ch4-INB ch4-INA ch4-OUTB ch4-OUTA SUBGND Function Operational amplifier negative input Operational amplifier positive input Driver channel 3 negative output Driver channel 3 positive output Driver channel 3 input Driver channel 3 input, gain adjustment Power supply Power supply Bias amplifier input pin Driver channel 4 input, gain adjustment Driver channel 4 input Driver channel 4 positive output Driver channel 4 negative output Substrate ground
BTL Driver for CD Player 2/5
May, 2004 V1.3
ML1469
_______________________________________________________________ Absolute Maximum Ratings
Parameter Supply Voltage Power Dissipation Storage Temperature Symbol VCC Pd Tstg Ratings 13.5 1.7 *1 -55 ~ +150 Units V W
o
C
Note 1 : Use base condition : 100x100mm, t=1.6mm, copper leaf 50%, glass epoxy mounting. Derating is done at 13.6mW/ oC for operation above Ta = 25 oC.
Recommended operating conditions
Parameter Operating Temperature Operating Voltage Symbol TOPR VOPR Ratings -25 ~ +85 5.0 ~ 12.0 Units
o
C
V
Electrical Characteristics
Parameter Quiescent Current Output Voltage Offset Output Voltage "H" Output Voltage "L" Gain (Close Circuit) Ripple Rejection Slew Rate Mute-off Voltage 3.3V / 5.0V Regulator Output Voltage Load Regulation Line Regulation Operational Amplifier Offset Voltage Input Bias Current "H" Level Output Voltage "L" Level Output Voltage Output Drive Current (Sink) Output Drive Current (Source) Voltage Gain (Open Circuit) Slew Rate Ripple Rejection Common Mode Rejection Ratio Symbol ICC VOO VOHD VOLD GVC RR SR VMOFF VREG VRL VVCC VOFOP IBOP VOHOP VOLOP ISINK ISOURCE GVO SROP RROP CMRR Conditions No load Min Typ Max Units 5.5 10.0 13.0 mA -40 40 mV 5.2 5.6 V 1.3 1.55 V 7.0 8.0 9.0 V 60 dB 2.0 V/uS 2.0 V 3.10 3.30 3.50 V 4.75 5.00 5.25 -50 0 10 mV -10 0 35 mV -2 6.0 50 ohm, at VCC 50 ohm, at ground VIN=75dBV,f=1kHz VOUT=4VP-P square, f=100kHz VIN=-20dBV,f=100kHz VIN=-20dBV,f=1kHz 10 10 50 30 78 1 65 84 0 2 20 300 mV nA V 1.8 V mA mA dB V/uS dB dB
VIN=0.1Vrms, f=1kHz VIN=0.1Vrms, f=100Hz VOUT=3Vp-p square wave, f=100kHz
IL=100mA IL=0 ~ 200mA VCC=6 ~9V, IL=100mA
70
BTL Driver for CD Player 3/5
May, 2004 V1.3
ML1469
_______________________________________________________________ Application Circuit
SERVO PRE AMP
TRACKING FOCUS SPINDLE SLED MOTOR M 20 19 18 SLED Vcc TRACKING ACT 21
28
27
26
25
24
23
22
BIAS
17
16
15
ML1469 V50
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FOCUS ACT Vcc
MUTE ON-Low OFF - High 5.0V Regulated Output + 22uF
M SPINDLE MOTOR
2SB1237
Precautions for use
(1) A thermal shut down circuit is built. The output current is muted, when the temperature of the chip reaches 175oC typical. (2) It the mute (Pin 7) voltage is open or less than 0.5V, the output current is muted. Under normal operating conditions, make sure to pull this pin above 2.0V. (3) If the bias pin (Pin 23) drops below 1.4V, the output current is muted. Make sure that under normal conditions, this pin is at 1.6V or above. (4) If the power supply voltage drops below 4.5V typical, the drivers are turned off. When the voltage exceeds 4.7V typical, the drivers return to their previous state. (5) The channel 4 output is muted in the event of a thermal shut down, mute on, bias pin voltage drop. Other sections are not muted. When muted, the internal bias voltage of the output pin becomes (roughly (VCC-VF)/2). (6) The built-in input resistance has a positive temperature coefficient of 1500ppm/oC. When changing the gain using an external resistance, the gain will change as the temperature of the resister changes. When using the built-in input resistance, there are virtually no gain variation due to temperature. (7) Make sue to connect a 0.47uF capacitor to the IC input to filter out voltage ripple. (8) Heat dissipation fins are attached to the GND on the inside of the package. Make sure to connect these to the external GND. (9) The capacitor connected between the regulator output (Pin 6) and the GND also serves to stop oscillation of the IC circuit. Consequently, make sure to use one with good temperature characteristics.
BTL Driver for CD Player 4/5
May, 2004 V1.3
ML1469
_______________________________________________________________ Mechanical Dimensions HSOP-28 Unit: mm (inch)
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
BTL Driver for CD Player 5/5
May, 2004 V1.3

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