ICs for Compact Disc/CD-ROM Player AN8497SA 3-channel linear input PWM driver IC ■ Overview Unit: mm 16 +0.10 0.65 (0.625) • Maximum 64% reduction of power consumption compared with a conventional linear 3-channel driver IC • Free gain setting by an external resistor due to voltage feedback • Standby function available (standby current < 20 µA) • Only for supply voltage 5 V • Phase compensation function 0.3 –0.05 Seating plane 0.65±0.10 0.65±0.10 ■ Features +0.10 0.2–0.05 1.5±0.2 1 6.1±0.3 17 0.1±0.1 32 8.1±0.3 11.0±0.3 The AN8497SA is a PWM output 3-channel driver IC supporting linear inputs, and best suited for an actuator and a motor drive for CD-ROM and DVD-ROM. Due to its linear input, a conventional system can be used only by replacing a driver. And, due to an adoption of PWM output, you can reduce considerably power consumption compared with a conventional driver. Further a space saving surface mount package is adopted thanks to its low thermal generation. (0.5) SSOP032 P-0300 ■ Applications Standby (full circuit) FB3 17 CT 18 19 VPUMP 20 BC2 21 SVDD SVDD 15 In3 SGND VREF In2 FB2 14 ABS 13 ABS 12 ABS 11 Logic 10 Logic In1 9 FB1 8 YC2B 7 YC2A 6 YC1B 5 YC1A 4 Logic 16 detection V/I SO1 3 RO1 BC1 VREF detection V/I 2 22 TSD Predriver Predriver H bridge FO1 Triangular wave oscillator Charge pump V/I Predriver 1 N.C. H bridge H bridge VM12 23 RO3 24 VM3 25 PG3 26 FO3 27 SB 28 SO2 29 RO2 30 FO2 31 32 PG12 ■ Block Diagram CLK • Optical disk drive 1 AN8497SA ICs for Compact Disc/CD-ROM Player ■ Pin Descriptions Pin No. Symbol 1 VM12 2 Description Pin No. Symbol Description Channel 1, 2 power supply 17 FB3 Channel 3 feedback signal output pin FO1 Channel 1 forward output pin 18 CT Triangular wave output pin 3 RO1 Channel 1 reverse output pin 19 CLK 4 SO1 Channel 1 feedback signal input pin 20 5 YC1A Channel 1 feedback gain adjustment pin A 21 BC2 Charge pump capacitor connection pin 2 6 YC1B Channel 1 feedback gain adjustment pin B 22 BC1 Charge pump capacitor connection pin 1 7 YC2A Channel 2 feedback gain adjustment pin A 23 N.C. N.C. 8 YC2B Channel 2 feedback gain adjustment pin B 24 RO3 Channel 3 reverse output pin 9 FB1 Channel 1 feedback signal output pin 25 VM3 Channel 3 power supply 10 In1 Channel 1 driver input pin 26 PG3 Channel 3 power ground 11 FB2 Channel 2 feedback signal output pin 27 FO3 Channel 3 forward output pin 12 In2 Channel 2 driver input pin 28 SB All shut off input pin 13 VREF Reference voltage input pin 29 SO2 Channel 2 feedback signal input pin 14 SGND Control circuit ground 30 RO2 Channel 2 reverse output pin 15 In3 Channel 3 driver input pin 31 FO2 Channel 2 forward output pin 16 SVDD Control circuit power supply 32 PG12 Channel 1, 2 power supply CLK synchronous pulse input pin VPUMP Charge pump step-up voltage output ■ Absolute Maximum Ratings Parameter Supply voltage *2 Symbol Rating Unit SVDD 6.0 V − 0.3 to +6.0 V V(m) 7.0 V V(n) SGND to SVDD V ISVDD 200 mA IVM12 2 000 IVM3 1 200 I(o) ±1 000 mA I(p) ±1 200 mA PD 400 mW Topr −30 to +75 °C Tstg −55 to +150 °C VM12 , VM3 Supply voltage application range SVDD VM12 , VM3 Drive output voltage *7 Control signal input voltage Supply current *8 *3 Drive output current channel 1, 2 Drive output current channel 3 Power dissipation *6 *4 Operating ambient temperature Storage temperature *1 *1 *5 Note) Do not apply external currents or voltages to any pins not specifically mentioned expect for the power supply and GND pins. For circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC. *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: The voltage in a step-up voltage circuit exceeds a supply voltage. Refer to "■ Electrical Characteristics" for an allowable value of a step-up voltage. *3: Use within 1 000 mA in each channel 1 and channel 2. 2 ICs for Compact Disc/CD-ROM Player AN8497SA ■ Absolute Maximum Ratings (continued) Note) *4: Use within the range of not exceeding PD = 400 mW without heat sink and at Ta = 75°C in accordance with an allowable power dissipation characteristic curve of "■ Application Note". *5: o = 2, 3, 30, 31 *6: p = 24, 27 *7: m = 2, 3, 4, 24, 27, 29, 30, 31 *8: n = 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 ,15, 17, 18, 19, 22, 28 ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit SVDD 4.5 to 5.0 to 5.5 V VM12 , VM3 3.5 to 5.0 to 5.5 ■ Electrical Characteristics at SVDD = VM12 = VM3 = 5 V, VREF = 1.65 V, SB = 3.3 V, RL = 8 Ω, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Power supply current at standby IVMS SB = "L" 10 µA Control supply current at standby ISVS SB = "L", VREF = 0 V 10 µA Control supply current at no input ISVA SB = "H" 5 10 mA Output voltage VPMP IPMP = 0 mA 7.0 8.4 9.8 V Current output capability VPMPL IPMP = −1 mA 5.9 7.3 8.7 V Sink current ICTSN VCT = 1.6 V 133 153 173 µA Source current ICTSR VCT = 0.1 V 37 44 51 µA fTR CCT = 100 pF 175 200 225 kHz RON1 , RON2 RL = 8 Ω 1.4 2.3 Ω RL = 8 Ω 0.8 1.6 Ω Charge pump Triangular wave generation circuit Self-running oscillation frequency Driver block Channel 1, 2 output on resistance (upper/lower) Channel 3 output on resistance (upper/lower) RON3 Output offset voltage VOS −50 50 mV Voltage gain "+" G 12.0 14.0 16.0 dB "+" / "−" relative gain GR −1.5 1.5 dB Dead zone converted to input VDZ 0 10 30 mV VRESH 4.5 V High-level input voltage VRRH 1.35 V Low-level input voltage VRRL 0.7 V High-level input voltage VSBH 2.7 V Low-level input voltage VSBL 0.8 V SVDD reset Reset supply voltage VREF reset Standby operation 3 AN8497SA ICs for Compact Disc/CD-ROM Player ■ Electrical Characteristics at SVDD = VM12 = VM3 = 5 V, VREF = 1.65 V, SB = 3.3 V, RL = 8 Ω, Ta = 25°C (continued) • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Conditions Min Typ Max Unit TTSD 160 °C ∆TTSD 40 °C ∆VRES 0.2 V Thermal protection Thermal protection operating temperature Thermal protection hysteresis width SVDD reset Hysteresis width ■ Usage Notes 1. Be sure to use SVDD in the highest potential within the IC. 2. Standby operation, reset operation Pin 28 is a standby switch input pin. You can get an active mode with high-level and standby mode with low-level. In a reset operation, all the functions of the IC stop. In a reset mode (SVDD reset, VREF reset and thermal protection on), only a charge pump operates. 3. Power on and off be done in a standby mode (VSB: Low). 4. Do not use pin 13 (VREF) in an open state. 5. Take time to check the characteristics on use. When changing an external circuit constant for use, consider not only static characteristics, but also transient characteristics and external parts with respect to the characteristics difference among ICs so that you can get enough margin. 6. Keep each output pin from being short-circuited to SVDD or VM or GND (line-to-supply and line-to-ground fault) and also between themselves (load short-circuit). Otherwise the IC will be damaged and is likely to get fired. 7. Be cautious on a dip soldering. Prior study is required. ■ Application Note • PD Ta curves of SSOP032-P-0300 PD T a 1.400 1.288 1.200 Power dissipation PD (W) Mounted on standard board (glass epoxy: 50 × 50 × t0.8 mm3) Rth(j-a) = 97.0°C/ W 1.000 0.800 0.667 0.600 0.400 Independent IC without a heat sink Rth(j-a) = 187.2°C/ W 0.200 0.000 0 25 50 75 100 125 Ambient temperature Ta (°C) 4 150 ICs for Compact Disc/CD-ROM Player AN8497SA ■ Application Circuit Example FB3 CT 17 18 100 pF 19 CLK 0.1 µF 20 21 BC2 VREF detection SVDD 8 200 pF ch.1 input 8 200 pF ch.2 input In3 15 SGND 14 18 kΩ VREF 13 15 kΩ ABS In2 12 ABS 910 Ω ABS FB2 11 Logic 15 kΩ 30 kΩ Logic In1 10 FB1 9 YC2B 8 YC2A 7 YC1B 6 YC1A 5 SO1 4 8Ω 30 kΩ Logic 910 Ω V/I 1.1 kΩ SVDD 16 detection V/I RO1 3 22 BC1 TSD Predriver Predriver H bridge FO1 2 Triangular wave oscillator Charge pump V/I Predriver VM12 1 8 200 pF VPUMP H bridge H bridge VM = 5 V 23 N.C. 24 RO3 25 VM3 PG3 26 27 FO3 28 SB Standby (full circuit) CLK synchronous signal input 0.1 µF M 8Ω 29 SO2 30 RO2 31 FO2 32 PG12 High: Active Low: Standby Standby sgnal input ch.3 input VREF = 1.65 V SVDD = 5 V 5