AT5802

AT5802 AIMTRON | Alldatasheet

Document overview

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Technical content

Features

˙4 channels of Power-Mos H-bridge drivers. ˙Built-in DC/DC converter control circuit. ˙Built-in reset circuit. ˙Built-in VG booster circuit. ˙Built-in voltage down regulator circuit. ˙Built-in On/OFF function ˙Low power consumption. ˙Direct PWM drive system. ˙QFP44 package.

Description

The AT5802 is a 4-channel driver and power controller for portable CD players on a single chip. The driver block power supply uses the on-chip switching regulator, making this component an ideal choice for low-power sets.

Applications

Portable compact disc players (CDP) Portable Mini disc player (MD) Other portable compact disc media Block Diagram MUTE1 DC/DC CONVERTER 32 31 30 29 28 27 26 25 24 23 1110987654321 POWER OFF STARTER TRIANG WAVE SW VSYS EI EO N.C. N.C. N.C. START OFF CLK MUTE34 MUTE1 RESET IN1 IN2 IN3 IN4 VREF FIL1 FIL2 FIL3 FIL4 VG LG PGND3 GND REGO REGB DC_IN CT SOFT SPRT OUT1+ OUT4+ OUT1- PGND2 PVCC2 OUT2+ OUT2- OUT3+ OUT3- PGND1 OUT4- PVCC1 PRE-DRIVERPRE-DRIVERPRE-DRIVER PRE-DRIVER MUTE34 RESET PRE-DRIVER POWER SUPPLY CONVERTER REGULATOR SWITCH OUTPUT VSYS DETECT

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Pin Assignments

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1 SW Booster transistor drive

2 VSYS Control circuit power supply input

3 EI DC/DC converter error amplifier input

4 EO DC/DC converter error amplifier output

5 N.C. - 6 N.C. - 7 N.C. -

8 START DC/DC converter starting input

9 OFF DC/DC converter off input

10 CLK External clock synchronization input

11 MUTE34 CH3 CH4 mute input

12 MUTE1 CH1 mute input

13 RESET Reset output

14 IN1 CH1 input

15 IN2 CH2 input

16 IN3 CH3 input

17 IN4 CH4 input

18 VREF Reference power supply input

19 FIL1 CH1 feedback filter

20 FIL2 CH2 feedback filter

21 FIL3 CH3 feedback filter

22 FIL4 CH4 feedback filter

23 OUT4- CH4 negative output

24 OUT4+ CH4 positive output

25 PGND1 Power unit ground 1

26 PVCC1 H-bridge power supply input 1

27 OUT3- CH3 negative output

28 OUT3+ CH3 positive output

29 OUT2- CH2 negative output

30 OUT2+ CH2 positive output

31 PVCC2 H-bridge power supply input 2

32 PGND2 Power unit ground 2

33 OUT1- CH1 negative output

34 OUT1+ CH1 positive output

35 SPRT Short-circuit protection setting input

36 SOFT Soft-start setting input

37 CT Triangular wave output

38 DC_IN AC adapter power supply input

39 REGB TR driving terminal for regulator

40 REGO Battery power supply input

41 GND Pre-Unit Power supply ground

42 PGND3 Power unit ground 3

43 LG Drive coil for boosting VG terminal

44 VG Drive the power-Mos circuit power supply input

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Absolute maximum ratings (Ta = 25oC) Parameter Symbol Limits unit H-bridge power Supply voltage PVCC1, 2 7 V Battery power Supply voltage REGO 7 V System power Supply voltage VSYS 7 V AC adapter power Supply voltage DC_IN 7 V Pre-driver power Supply voltage VG 7 V Power dissipation Pd 1000 * mW Operating temperature range Topr -30~+85 oC Storage temperature range Tstg -55~+150 oC ﹡Derating is done 5mW/ oC for operation above Ta=25oC. Recommended operating conditions (Ta = 25oC) Parameter Symbol Min. Typ. Max. unit H-bridge power Supply voltage PVCC1, 2 1.5 2.4 6.5 V Battery power Supply voltage REGO 1.5 2.4 6.5 V System power Supply voltage VSYS 2.0 2.5 6.5 V AC adapter power Supply voltage DC_IN 2.0 4.5 6.5 V Pre-driver power Supply voltage* VG 5.0 6.0 6.9 V Ambient temperature Ta -10 25 70 oC ﹡The built-in booster circuit is not used, but the voltage is supplied from outside.

Electrical characteristics

(Unless specified particular, Ta = 25oC, PVCC1, 2=REGO=2.4V , VSYS=2.5V , VG=6V , VREF=1.25V ) Parameter Symbol Min. Typ. Max. Unit Conditions Common section REGO stand-by current I REGOST - - 3 μA VSYS=0V VG stand-by current IVGST - - 3 μA VSYS=0V REGO supply current IREGO - 0.45 1.0 mA DC_IN supply current IDC_IN - 1.4 3.0 mA DC_IN=5V VSYS supply current IVSYS - 4.5 9.0 mA VG supply current IVG - 0.35 0.7 mA CT=470PF,fCLK=88.2KHz VIN=1.49V LG leak current ILGLK - - 3 μA LG=6V , VSYS=0V PWM driver Output on-resistance RON - 1.9 4 Ω Sum of on-resistance of top and that of bottom Output offset voltage V OO -50 0 50 mV Output voltage gain GVC 11.5 14.0 16.5 dB RIN=30KΩ Input dead zone CH1,2 (one side) VDB12 2 20 40 mV CH1,2 Input dead zone CH3,4 (one side) VDB34 0 5 15 mV CH3,4

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4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Parameter Symbol Min. Typ. Max. Unit Conditions VG pin threshold voltage V VGTH 6.0 6.5 7.0 V LG=5V DC/DC converter SW pin output voltage H V SWH 1.3 1.8 - V CT=0.2V , ISW=-5mA, EI=0.7, VSPRT=0V SW pin output voltage L V SWL - 0.5 1.0 V CT=2V , I SW=1mA SW pin oscillating frequency at start t SWSTA 75 100 125 KHz VSYS=1.6V , VG=5V SW pin oscillating frequency (self-running) fSW1 46 58 70 KHz EI=0.7, CT=470PF, V SPRT=0V SW pin oscillating frequency (CLK synchronization) fSW2 - 88.2 - KHz EI=0.7, fCLK=88.2KHz, VSPRT=0V SW pin pulse duty at start D SWSTA 40 50 60 ﹪ VSYS=1.6V , VG=5V SW pin oscillating maximum pulse duty (self-running) DSW1 80 90 95 ﹪ EI=0.7, CT=470PF, VSPRT=0V , CLK=0V SW pin oscillating maximum pulse duty (CLK synchronization) D SW2 80 90 95 ﹪ EI=0.7, CT=470PF, VSPRT=0V Triangular wave generation circuit CT pin CT pin threshold voltage L VCTTHL 0.14 0.2 0.26 V CT=0.3V→0V sweep CT pin sink current I CTSIN 80 92 104 μA CT=1.0V CT pin output current ratio HCT 6.5 8 9.5 - Sink current/source current VSYS circuit section Discharge release voltage V DIS 1.40 1.51 1.62 V Starter→normal switching voltage VSTN 1.65 1.75 1.85 V VSYS=1.5V→2V sweep Normal→starter switching voltage VNST 1.57 1.67 1.77 V VSYS=2V→1.5V sweep Starter→normal switching hysteresis voltage VSTNHIS 40 80 120 mV V STN-VNST Reset section EI pin reset voltage threshold ratio HRST 80 85 90 ﹪ Ratio of EI pin threshold ratio Reset pin output voltage VORESE T - - 0.5 V I RESET=-1mA Reset pin leak current ILKRESE T - - 2 μA VRESET=2.5V Regulator circuit section Regulator output voltage V REG 2.9 3.2 3.5 V REGO=OPEN, DC_IN=6V REGB pin output voltage V OREGB - - 1.4 V DC_IN=6V , I REG=10mA REGB pin leak current I LKREGB - - 3 μA REGO=3.5V , DC_IN=6V , REGB=6V REGB pin limit current I LMREGB 10 15 20 mA DC_IN=6V

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Parameter Symbol Min. Typ. Max. Unit Conditions DC_IN low-voltage mute ON voltage VDC-INL V - - 1.3 V DC_IN low-voltage mute OFF voltage VDC-INO F 1.9 - - V ﹡This product is not designed for protection against radioactive rays.

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Application circuit AT5802 1110987654321 2324252627282930313233 IN1 Vref 220u SLED SPINDLE FOCUSTRACKING MM 0.1u0.1u CLK OFF SW START SW 10K 0.022u 0.022u 0.022u 0.022u IN210K IN320K IN433K RESET MUTE1 MUTE34 470P 0.1u 0.1u 22K 220u 10K24K 10uH 1000P 100 101K 0.1u 59T 0.1u100u 10u 10u ZENER 220 DC JACK B1013 C4115SR C4115SR 47P 100uH

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Application explanation 1. DC/DC converter To set the output voltage, use the following R1 and R2. 219.0 R RRVSYS +×= 2. Booster circuit for driving the Power-Mos This circuit can generate a power source VG necessary for driving the built-in Power-Mos transistor. Oscillation frequency of LG terminal is independent and different from that of the main DC/DC converter. When system start-up, this circuit activates at first. 3. Down voltage regulator circuit The DC_IN is the power source of regulator ci rcuit. If PNP transistor is externally attached, it allows the regulator circuit with the REGO set as the output voltage. Output voltage is 3.2V , this regulator output voltage depends on the built-in resistance. This circuit unable to control ON/OFF.

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 4.Soft start The soft-start is functioned by putting a capacitor between SOFT terminal and GND. 5. Short circuit protection If the voltage of SPRT terminal has reached 0.5V , switching of SW terminal is disabled. The main DC/DC converter can be turned off only through the activation of timer latch circuit. Accordingly be sure to attach the capacitor on the SPRT terminal. ⊙ While the error amp output of EO is being comple tely set at “H”, SPRT terminal can be charged. The time until stopping the switching is determined by the following formula for the capacitor of SPRT terminal. SPRT TH SPRT I VCt ×= (sec) (V TH=0.5V , ISPRT=5.8μA) ⊙ While the OFF terminal is being set at below VSYS-1.5V , SPRT terminal can be charged. The time until stopping the switching is determined by the following formula for the capacitor of SPRT terminal. SPRT TH SPRT I VCt ×= (sec) (V TH=0.5V , ISPRT=11.5μA) 6. PWM driver H-bridge driver using 4 pieces of N-channel Mos transistor on output stage. Polarity of output and PWM duty are changed in proportion to differential voltage and absolute value of input sandwiching Vref. Load is direct-PWM driven by square wave of this changing duty. This driver is voltage feedback type, so, voltage gain is invariable in spite of fluctuation of battery voltage.

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 7. Thermal shut down When the chip temperature has been 150 ℃ (Typ.), the output current is muted. And when the chip temperature has dropped to 130℃ (Typ.), the driver circuit starts up. Note in use 1. Between power supplies, attach a by-pass capacitor (approx. 0.1μF) at the root of this IC. 2. In principle, do not apply voltage below sub-potential of IC to terminal. Examine in consideration of operation margin, when each driver output falls below sub-voltage of IC (GND) due to counter- electromotive-force of choke coil, etc. 3. Output pin is to avoid short-circuiting with PVCC, GND, and other output pins. And, be fully careful in the direction of an integrated circuit on the substrate. 4. When use AC adapter, if apply beyond 7V to DC_IN pin, connect Z-Di with DC_IN pin. So keep voltage of DC_IN being below 7V . To protect IC, once the voltage to be applied on the DC_IN terminal exceeded 7.5V (Typ.), SPRT terminal can be charged.( I SPRT=11.5μA, see short circuit protection)

4 - C h a n n e l d r i v e r + P o w e r C o n t r o l l e r Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Package Outlines (units:mm): QFP-44