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| MITSUBISHI(Standard Linear ICs) M62295GP M62295GP LCDPC BACK- LIGHTCONTROLIC BACK-LIGHT CONTROL IC DESCRIPTION M62295GP is a semiconductor integrated circuit designed for PC back- light control, which employs 2 output totempole output circuit specifically suitable for inverter drive with piezo device. Such necessary functions as light control, protection circuit are housed in 16pin SSOP package. This allows for simplified peripheral circuit as well as compact and thin set design. PIN CONFIGURATION (TOP VIEW) G2 1 GND 2 N.C 3 Adj2 4 Vref 5 Cscp1 6 Cscp2 7 Iscp 8 Outline 16P2E-A 16 G1 15 Vcc 14 P/C 13 CT2 12 CT1 11 RT 10 FB 9 IN - FEATURES * Direct drive to n-ch/ p-ch MOSFET * Fixed output duty: 45% * Output current (peak) : 300mA * Light control * Pulse synchronous control Output OFF period is adjusted synchronous with the OSC frequency (1kHz-200kHz). * Light control available from 10%(MIN.) up to 100% by the voltage applied from outside (Adj2 terminal). * Protection functions * 2 kinds of timer-latch time setting available by 3 triggers (few seconds, several tens of seconds set by external capacitor) N.C : NO CONNECTION APPLICATION * CLD Back-light contorol for Note P.C etc. BLOCK DIAGRAM Vcc 15 P/C 14 RT 11 CT1 12 CT2 13 VCC 5 Vref Ref. volt. UVLO ON/OFF OSC. 1 G2 9 IN 1.25V 2.5V VCC Protection Circuit 0.25V (Timer Latch) 16 G1 8 3 4 2 GND 10 FB 6 7 Cscp1 Cscp2 Iscp N.C Adj2 (1/7) MITSUBISHI(Standard Linear ICs) M62295GP PC BACK- LIGHT CONTROL IC ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted) Symbol Vcc IOUT Pd Topr Tstg Parameter Supply voltage Output current Power dissipation Operating temperature Storage temperature Continuous Peak Ta=25C Conditions Ratings 28 50 300 400 -20 ~ +85 -40 ~ +125 Unit V mA mA mW C C ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=15V, unless otherwise noted) Symbol Vcc Icc Icc(PC) VTH ON VTH OFF Vhys IB AV GB VFB+ VFBIFB+ IFBVREF LINE Iref(Max) fosc fosc(Max) VRT VAdj2(Min) Min Duty VAdj2(Max) IAdj2 fosc(CT2) FB VTH(H) FB VTH(L) Iscp VTH(L) Parameter Operating supply voltage range Circuit current Circuit current in power control state Test conditions Limits Min. 3.6 4.5 15 3.27 35 -500 6 30 3.43 3.36 70 -30 80 0.6 2.65 1 -50 2.40 1 2.8 100 2 -80 2.50 5 5 100 200 1.1 2.3 1.25 2.4 10 0.2 -10 1 2.35 0.2 1.1 2.5 0.25 1.25 2.65 0.3 1.4 1.4 2.5 15 0.3 +100 2.60 200 140 Typ. Max. 26 7.5 55 3.59 Unit V mA A V V mV nA dB MHz V mV mA A V mV mA KHz KHz V V % V nA KHz V V V ON threshold voltage OFF threshold voltage Hysterisis Input bias current Open loop gain Gain bandwidth product Max. output voltage Min. output voltage Max. sink current Max. source current Reference voltage Line regulation Max. load current Oscillating frequency Max. oscillating frequency RT termina voltage Adj2 voltage at min. duty Min. duty for light control Adj2 voltage at 100% duty Adj2 terminal current Light control frequency FB terminal H threshold volt. FB terminal L threshold volt. IscpL detection voltage. fosc = 100KHz VAdj2=Vref 5 0.1 -100 (2/7) MITSUBISHI(Standard Linear ICs) M62295GP PC BACK- LIGHT CONTROL IC ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=15V, unless otherwise noted) Symbol ICSCP1 ICSCP2 CSCP1VTH CSCP2VTH Itimer-L P/C IP/C VTH(ON) Duty VOL VOH Parameter CSCP1 charge current CSCP2 charge current CSCP1 detection voltage CSCP2 detection voltage Circuit current at timer-latch P/C terminal flow-in current P/C threshold voltage Output duty Output Low voltage Output High voltage 13.0 RT=12.4K, CT1= 470pF Test conditions Limits Min. -0.8 -0.8 2.35 1.1 1.2 1 0.4 42 Typ. -1.3 -1.3 2.5 1.25 2.2 2 0.7 45 0.05 13.5 Max. -1.8 -1.8 2.65 1.4 3.2 4 1.0 48 0.4 Unit A A V V mA A V % V V (3/7) MITSUBISHI(Standard Linear ICs) M62295GP PC BACK- LIGHT CONTROL IC Function description * Output oscillation circuit and tooth-wave generating circuit for light control (RT, CT1, CT2) As shown in Fig.1, charge/discharge current for each oscillation circuit is set by connecting resistors to RT terminal. RT terminal is connected to FB terminal by resistor to control the frequency for light control. CT1 is the terminal for connecting capacitor for output oscillation circuit, generating triangularwave oscillating between lower limit (approx. 0.25V) and upper limit (approx. 1.25V) by the charge current set at RT terminal. CT2 is the terminal for connecting capacitor for tooth-wave for light control, into which one twentieth of charge current of CT1 terminal flows generating tooth-wave oscillating between lower limit (approx. 0.25V) and upper limit (approx. 1.25V). Each charge current and oscillation frequency is decided by the formula shown below. CT1 charge/ discharge current = (ICT1charge) CT2 charge/ discharge current = (ICT2charge) Output freq. (Fosc) = 1 T 1.25 Ro 1.25 1 Ro * 20 1 CT1 * 2 ICT1charge 1 CT2 * 1 ICT2charge CT1 RT (1.25V) CT1 CT2 FB Ro CT1 CT2 Fig.1 Connections of RT,CT1, CT2 1.25V CT1 T G1 (POUT) G2 (NOUT) 0.8V 0.7V 0.25V = 1.25V Tooth - wave freq. (CT2osc) = CT2 0.25V Tooth - wave freq. (CT2osc) Output freq. (Fosc) (divided ratio) = CT2 * 10 Fig.2 Waveform for CT1, CT2, and G1, G2 * ON/OFF control function (P/C) ON/OFF control is available using P/C terminal. As shown in Fig.3, ON/OFF control is made by connecting P/C terminal to Vcc or GND or by making P/C terminal open. P/C = Vcc : IC in normal operation mode P/C = GND&OPEN : IC operation at halt Vcc P/C Fig.3 Connection example for P/C (4/7) MITSUBISHI(Standard Linear ICs) M62295GP PC BACK- LIGHT CONTROL IC * Light control function (Adj2) Fig.4 shows the connections of Adj2 terminal. When the light control voltage is 2.4V or more, divided voltage by the resistors is applied. Light control is decided by the OSC. frequency of CT2 and the applied voltage to Adj2 terminal. Fig.5 shows how the applied voltage to Adj2 terminal relates itself to light control. The voltage range of Adj2 terminal available for light control is 0.1V to 2.4V. When the voltage is 2.4V or more, light control duty becomes minimum(10%), and when it is 0.1V or less, light control duty becomes 100%. Minimum duty is available by connecting Adj2 terminal to Vref terminal. Output waveform on above mentioned stage is shown in Fig.6(a) to Fig.6(c). Fig6(a) shows 100% light controlled state, Fig.6(b) middle state (50% light controlled), Fig6(c) minimum duty state. Formula for light control level by light control voltage ONDuty = (100 - ONDutyMin) * VAdj2 : Adj2 terminal voltage (V) ONDutyMin = 10 (%) 2.4 - VAdj2 2.4 Light control voltage Light control voltage Adj2 R1 Adj2 R2 (a). In the case of direct applying to Adj2 terminal (b). In the case of applying to Adj2 terminal by the division of resistors Fig.4 Connections of Adj2 terminal 100 80 60 40 20 10 0.1 1.0 1.4 2.0 2.4 +ONDutyMin (%) Adj2 terminal voltage (V) Fig.5 Adj2 terminal voltagelight control duty characteristics G1 output G2 output CT2 wave form Fig.6(a) 100% light control G1 output G2 output CT2 wave form Fig.6(a) 50% light control G1 output G2 output CT2 wave form Fig.6(a) 10% light control (5/7) MITSUBISHI(Standard Linear ICs) M62295GP PC BACK- LIGHT CONTROL IC * Protection function (timer-latch) (Cscp1, Cscp2, Iscp) Application for timer-latch by detecting tube current and feecback voltage is available by using Iscp, Cscp1, Cscp2 terminal. Two kinds of setting for timer-latch time is available by the setting of Cscp1, Cscp2. Each timer-latch time is set by the formula below. Cscp1 : Terminal for capacitance for timer-latch set (few sec.) Timer-L (Cscp1) = Cscp1 * 2.5 1.3 * 10 -6 Cscp1 Cscp1 Cscp2 Cscp2 Cscp2 : Terminal for capacitance for timer-latch set (few msec.) Timer-L (Cscp2) = Cscp2 * 1.25 1.3 * 10 -6 Fig.7 Connections of Cscp1, Cscp2 Detection of tube current Detection of tube current is made by Iscp terminal. Detection voltage for Iscp terminal is set 1.25V. After power is on, when Iscp voltage does not rise up to 1.25V by timer-L(Cscp1) time, or when Iscp voltage becomes 1.25V or less after start-up, abnormality is detected to move on to the protection operation mode in Fig.1. If Iscp voltage is less than 1.25V, light control is not made(100%). Detection of feedback voltage Detection of feedback voltage is made by FB terminal. When FB terminal voltage goes down to FB low detection voltage (0.25V) or less, or when it rise up to FB terminal high detection voltage or more, abnormality is detected to move on to the protection operation mode in Fig.1. Operation state Normal start-up Io=Max Start-up in shortcircuited state Io=0 Operation stop after 10ms Operation stop instantaneously Operation stop after 2sec. Operation stop after 2sec. Normal start-up if turn-on is made within 2sec. Operation stop instantaneously Operation stop instantaneously Operation stop instantaneously BL tube current detection Iscp Fig.8 Connections of Iscp terminal Protection operation mode Triggers for protection operation Ampout="H" Ampout="L" Io=0 Timer-latch time 2sec 10msec Start-up in open state Start-up in black mode OFF ON Shortcircuit while Io=Max in operation Io=0 Open while in operation Table 1. Protection operation mode at a glance Note 1. Timer-latch time refers to the time under Cscp=1uF, Cscp2=0.1uF. 2. Amp. output is "H" when tube current I0 equals to 0, "L" when it is at its minimum. Detection voltage is 2.5V("H" side), 0.25V("L" side). (6/7) MITSUBISHI(Standard Linear ICs) M62295GP PC BACK- LIGHT CONTROL IC (7/7) |
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