BD9478F Datasheet LED Drivers series for LCD Backlights PWM pulse Generator for LCD Panels BD9478F ●General Description ●Features ■The signal that the frequency synchronizes with the VSYNC signal is output to PWMOUT. ■The PWM pulse is generated with the DC signal of a BD9478F is PWM pulse generator for LCD panel. This IC compares triangle waveform which is generated inside IC and external DC signal, and generates a PWM pulse. This PWM pulse is provided to LED driver and controls LED grayscale. PWM pulse frequency can be synchronized to external signal frequency inputted to SYNC terminal. Even if this frequency gets out of range, it works in the setting frequency, is protected and it always provides stable PWM pulse to LED driver. triangular wave and PDIM generated with the LCT capacitor. When the VSYNC frequency exceeds the stipulated range, it fixes by a set frequency. (fSYNC<fPLLtyp*0.35 -> fPLL=0.36*fPLLtyp , fSYNC> fPLLtyp*2.75 -> fPLL=2.75*fPLLtyp) When VSYNC is a no signal input, the self-oscillation is operated by set frequency decided on the CT capacitance. When the pulse signal is input to the terminal EXTPWM, it shifts automatically to external PWM mode. ■ ■ ■ ●Key Specification Operating power supply voltage range: 4.5V to 5.5V Free Run frequency: 150Hz (CT=0.01µF) Operating Current: 2mA (typ.) Operating temperature range: -40 to +85 ℃ ℃ ●Package SOP-8: Pin Pitch: ● Applications LED backlight of monitor, TV, NOTE PC, etc. W(Typ.) D(Typ.) H(Max.) 5.00mm x 6.20mm x 1.71mm 1.27mm ●Typical Application Circuit CVCC VIN PDIM 1 VCC ort ce nn oC CEXTPWM CPDIM fVSYNC CVSYNC 2 EXTPWM 3 PDIM PWMOUT 8 PWM signal out (to LED driver) GND 7 LPF 6 Figure 1. SOP-8 CLPF1 CLPF2 RLPF2 4 VSYNC Figure 2. CT 5 CCT Typical Application Circuit ○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 14 001 ・ ・ 1/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Absolute maximum ratings (Ta=25℃) Parameter Symbol Power supply voltage Operating Temperature Range Storage Temperature Range Junction Temperature Power Dissipation *1 Ratings Unit VCC 7 V Ta(opr) -40 ~ +85 °C Tstg -55 ~ +150 °C Tjmax 150 689※1 Pd °C mW Decreases 5.5mW/°C at Ta=25°C or higher (When mounting a one-layer 70.0mmx70.0mmx1.6mm board) ●Operating Ratings (Ta = 25℃) Parameter Symbol Power supply voltage Range ～ 5.5 0.040 ～ 0.8 FCT ～ 30 4.5 VCC VSYNC input frequency range F_VSYNC EXTPWM input PWM signal frequency range F_EXTPWM Unit V kHz kHz The operating conditions written above are constants of the IC unit. Be careful enough when setting the constant in the actual set. FCT is dimming frequency that oscillates itself when VSYNC terminal is input no signal ●External Components Recommended Range Item VCC capacitance PLL Burst OSC oscillation frequency setting capacitance Symbol Setting Range Unit CVCC 0.1 ~ 10 µF CT 0.040 ～ 0.8 µF The operating conditions written above are constants of the IC unit. Be careful enough when setting the constant in the actual set. 8 7 6 5 GND LPF CT ●Marking diagram and physical dimension PWMOUT ●Pin Configuration VCC EXTPWM PDIM VSYNC D9478 1 2 3 4 Lot No. SOP-8 Figure 3. Pin Configuration www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ Figure 4. 2/12 Physical Dimension TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Electrical Characteristics (Unless otherwise specified, Ta=25°C ， VCC=5V) Limit Parameter Symbol Unit Condition Min. Typ. Max. ICC ― 2 4 mA Release voltage VUVLO 3.5 3.8 4.1 V Hysteresis voltage VUHYS 150 300 600 mV VCC=SWEEP DOWN Oscillation frequency when VSYNC is input no signal fCTNS 142 150 158 Hz CT=0.01µF,LPF=0V Triangle wave maximum voltage VCTH 2.70 3.00 3.30 V fCT=150Hz VCTL CT_SYNC _DET1 CT_SYNC _OKH 0.40 0.50 0.60 V fCT=150Hz 2.612 2.750 2.888 V LPF=2.0V→3.0V 2.517 2.650 2.783 V LPF=3.0V→2.0V [Whole Device] Circuit Current during Operation PDIM=3V,CT=0.01uF VSYNC=EXTPWM=open [UVLO Block] VCC=SWEEP UP [PLL Block] Triangle wave minimum voltage Synchronous signal abnormal judgment voltage, (at High frequency input) Synchronous signal normal judgment voltage, (at High frequency input) Internal RT voltage at Synchronous signal, abnormal judgment when High frequency input Synchronous signal abnormal judgment voltage, (at Low frequency input) Synchronous signal normal judgment voltage, (at Low frequency input) Internal RT voltage at Synchronous signal, abnormal judgment when High frequency input Switch voltage to internal fixed frequency Internal RT voltage at switched to internal fixed, frequency VRTFH CT_SYNC _DET2 CT_SYNC _OKL - 2.750 - V LPF=3V 0.331 0.350 0.389 V LPF=1.0V→0.1V 0.414 0.450 0.486 V LPF=0.1V→1.0V VRTFL - 0.360 - V LPF=0.25V VINTF 0.10 0.15 0.20 V LPF=1.0V→0.1V VRTFI - 0.900 - V LPF=0V Input High level VIH 2.0 - 20 V Input Low level VIL -0.3 - 0.8 V RIPD 0.5 1.0 2.0 MΩ Output High level VOH 4.3 4.85 - V Io=-1mA Output Low level VOL - 0.1 0.5 V Io=1mA 【Input pin (EXTPWM,PDIM,VSYNC)】 Pull down resistance 【Output pin (PWMOUT)】 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 3/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Pin Descriptions Pin No Pin Name 1 In/Out Function Rating [V] VCC - Power supply -0.3~7 2 EXTPWM In External PWM signal input -0.3~20 3 PDIM In DC signal input for Internal PWM -0.3~20 4 VSYNC In Synchronous signal input -0.3~20 5 CT Out Capacitance pin for VCO -0.3~7 6 LPF In/Out LPF output for PLL -0.3~7 7 GND - PWMOUT Out 8 - Ground -0.3~7 PWM dimming signal output ●Pin ESD Type VCC EXTPWM / VSYNC /PDIM CT VCC CT 7V LPF GND Figure 5. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ PWMOUT Pin ESD Type 4/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Block Diagram EXTPWM Frequency lock comparator VCC + ｆ×2.75 GND + Pulse signal VSYNC Phase Comparetor ｆ×0.35 r o t c le e s Voltage Controlled Oscillator + ｆ×0.15 CT Loop Filter PDIM DC signal Figure 6. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 PWMOUT + LPF ・ ・ PWM comparator - r o t c e l e s Block Diagram 5/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Typical Performance Curve Figure 7. Operating Current (ICC) [mA] vs. VCC[V] Figure 8. frequency fCT[Hz] vs. CT[nF] 500 400 3 frequency fCT [Hz] Operating current ICC [mA] 4 2 300 200 1 100 0 0 4.0 4.5 5.0 5.5 6.0 0 5 10 VCC [V] Figure 9. 15 20 CCT [nF] Figure 10. PWM DUTY [%] vs. PDIM[V] PWMOUT jitter [µs] vs. fCT[Hz] 4.0 120 3.5 100 PWMOUT jitter [us] PWM DUTY [%] 3.0 80 60 40 2.5 2.0 1.5 1.0 20 0.5 0.0 0 0 1 2 3 100 4 150 250 300 350 400 fCT [Hz] PDIM [V] Figure 11. 200 Figure 12. Start up waveform (Free Run mode) VCC EXTPWM mode waveform PDIM CT PDIM EXTPWM CT f-200Hz PWMOUT PWMOUT www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 6/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Pin Function ○Pin 1: VCC Power supply pin of the IC. Input range is from 4.5V to 5.5V Operation starts at VCC=3.8V（TYP.） or higher and shuts down at VCC=3.5V(TYP.) or lower. ○Pin 2: EXTPWM External PWM signal input terminal. In case of the following equation, the signal input to EXTPWM is output directly to PWMOUT. The equation ; f(PLL) < 2 * f(EXTPWM) f(EXTPWM) ; frequency of signal input to EXTPWM f(PLL) ; frequency of signal that synchronizes with VSYNC signal ○Pin 3: PDIM DC signal input terminal to generate internal PWM signal. The PWM signal is generated with compare it with a triangular waveform in IC. If PDIM input DC level is changed, PWM Duty can be changed. PDIM input DC voltage range is from 0.5V to 3.0V. (PWM Duty is changed from 0% to 100%) ○Pin 4: VSYNC Synchronous signal input terminal. The signal that synchronizes with the frequency of the signal input to VSYNC is generated with PLL. A triangular wave is generated based on the frequency of this synchronized signal, and the PWM pulse is generated with compare it with the PDIM signal ○Pin 5: CT Capacitor connection terminal that decides the oscillation frequency of VCO.. Please adjust the capacity of CT by the following equation so that the voltage of the terminal LPF may become 0.9V when the frequency of the signal that synchronizes is input. CT = 1.5 f PLLtyp [ Hz] [uF ] ○Pin 6: LPF Low pass filter connection pin. The pulse signal output from Phase Comparator is smoothed by Low path filter, and it inputs to Voltage. Controlled Oscillator (VCO). ○Pin 7: GND Ground pin of this IC. ○Pin 8: PWMOUT PWM signal output pin. The PWM signal generated in IC is output. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 7/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●About Dimming Function Burst Frequency Free Run Function Because PLL is incorporated, Free Run operation is possible for burst frequency. PLL circuit will operate like it synchronizes with the frequency of signal input to VSYNC pin. Then, the voltage that is in proportion to the frequency will be generated in LPF pin. When LPF pin voltage becomes 0.35V or lower, it will judge the external burst frequency is abnormal and clumps with the frequency of fPLLmin. Then, PLL frequency is changed to Free Run frequency. (note1) When the burst frequency becomes normal and LPF pin becomes over 0.9V, it will return to the state that synchronizes with the burst frequency.(note2) In the same way, when LPF pin becomes 2.75V or more, it will clump with the frequency of fPLLmax. When the burst frequency becomes normal and LPF2 pin becomes 2.65V or lower, it will return to the state that synchronizes with the burst frequency. When LPF pin becomes 0.15V or lower, it will judge the external burst frequency is not inputted and switches to the frequency of fPLLtyp.(Free Run mode) Figure 13. Note1 If fVSYNC is less than fPLLmin, the input of VCO is fixed to 0.36V inside IC, and PWM frequency is fixed to fPLLmin. However, since it is fVSYNC<fPLLmin, a LPF terminal approaches 0V. Then, it is set to LPF<0.15V, and it shifts to Free Run mode and PWM frequency is set to fPLLtyp. Note2 In order to shift to PLL mode, it is necessary to input bigger frequency than Free Run frequency into VSYNC. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 8/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F gea lto V 2 F P L Figure 14. （Free Run Operation Explanation） For example, if you set CT=0.01uF (At this time, fPLLtyp is adjusted to 150 Hz.) and f(VSYNC)=180Hz, the LPF pin voltage becomes 1.2V. The built-in VCO is proportional to the LPF pin voltage. If VSYNC is inputted to low frequency and it becomes LPF<0.35V (at this time, f<58Hz),it will clump at fPLLmin=58Hz. However, since it is fVSYNC<fPLLmin, a LPF terminal approaches 0V. Then, it is set to LPF<0.15V, and it shifts to Free Run mode and PWM frequency is set to fPLLtyp. (at this time, f=150Hz).If fSYNC is larger than fPLLtyp, PWM frequency will return to the frequency that synchronizes with f(VSYNC). If VSYNC is inputted high frequency and it becomes LPF>2.75V (at this time, f>343Hz),it will clump at fPLLmax=343Hz. When synchronous signal is not inputted to VSYNC terminal, LPF voltage decreases and then it becomes LPF<0.15V (at this time, f<19Hz), it oscillates typical frequency (at this time, f=150Hz). Note: Please set f(VSYNC) frequency to satisfy the following equations when you start up PLL mode. And then, please change f(VSYNC) frequency. f(VSYNC) > fPLLtyp , fPLLtyp = 1.5/(CT[uF]) [Hz] www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 9/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Dimming Signal Automatic Selection Function In this IC, even if either PWM dimming signal or DC dimming signal is inputted into the DUTY pin, it is automatically distinguished as DC or PWM in the IC. By detecting 4 cycles of the PWM signal within the 8 cycles of the burst frequency in the IC, it will switch automatically to PWM dimming. Therefore, set the burst frequency in the IC as follows: 2 X (Externally inputted PWM signal (fEXTPWM)) (Burst Frequency in the IC(same fSYNC)) Also, if you do not detect 4 cycles of the PWM signal within the 8 cycles of the burst frequency after switching to PWM dimming, it will automatically switch to DC dimming. ＜ (a) When (Burst Frequency in the IC) ＜ 2 X (Externally inputted PWM signal) Burst frequency in the IC Burst FF output in the IC Burst frequency 8 cycles Externally inputted PWM signal PWM signal 4 cycles Output dimming signal Output comparator of triangle wave and PWM signal PWM dimming output Figure 15. （ｂ）When (Burst Frequency in the IC ) ≧ 2 X (Externally inputted PWM signal) Burst frequency in the IC Burst FF output in the IC Burst frequency 8 cycles External PWM signal PWM signal 4 cycles Burst dimming signal Output comparator of triangle wave and PWM signal Figure 16. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 10/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Operational Notes 1.) Although the quality of this product has been tightly controlled, deterioration or even destruction may occur if the absolute maximum ratings, such as for applied pressure and operational temperature range, are exceeded. Furthermore, we are unable to assume short or open mode destruction conditions. If special modes which exceed the absolute maximum ratings are expected, physical safely precautions such as fuses should be considered. 2.) The IC can destruct from reverse connection of the power supply connector. Precautions, such as inserting a diode between t he external power supply and IC power terminal, should be taken as protection against reverse connection destruction. 3.) When attaching to the printed substrate, pay special attention to the direction and proper placement of the IC. If the IC is att ached incorrectly, it may be destroyed. Destruction can also occur when there is a short, which can be caused by foreign objects entering between outputs or an output and the power GND. 4.) Because there is a return of current regenerated by back EMF of the external coil, the capacity value should be determined af ter confirming that there are no problems with characteristics such as capacity loss at low temperatures with electrolysis conde nsers, for example by placing a condenser between the power supply and GND as a route for the regenerated current. 5.) The potential of the GND pin should be at the minimum potential during all operation status 6.) Heat design should consider power dissipation (Pd) during actual use and margins should be set with plenty of room. 7.) Exercise caution when operating in strong magnet fields, as errors can occur. 8.) When using this IC, it should be configured so that the output Tr should not exceed absolute maximum ratings and ASO. Wit h CMOS ICs and ICs which have multiple power sources, there is a chance of rush current flowing momentarily, so exercise c aution with power supply coupling capacity, power supply and width of GND pattern wiring and its layout. 9.) This IC has a built-in Temperature Protection Circuit (TSD circuit). The temperature protection circuit (TSD circuit) is only to cut off the IC from thermal runaway, and has not been designed to protect or guarantee the IC. Therefore, the user should not plan to activate this circuit with continued operation in mind. 10.) If a condenser is connected to a pin with low impedance when inspecting the set substrate, stress may be placed on the IC, so there should be a discharge after each process. Furthermore, when connecting a jig for the inspection process, the power must first be turned OFF before connection and inspection, and turned OFF again before removal. 11.) This IC is a monolithic IC, and between each element there is a P+ isolation and P substrate for element separation. There is a P-N junction formed between this P-layer and each element’s N-layer, which makes up various parasitic elements. For example, when resistance and transistor are connected with a terminal as in figure 15: When GND>(terminal A) at the resistance, or GND>(terminal B) at the transistor (NPN), the P-N junction operates as a parasitic diode. Also, when GND>(terminal B) at the transistor, a parasitic NPN transistor operates by the N-layer of other elements close to the aforementioned parasitic diode. With the IC’s configuration, the production of parasitic elements by the relationships of the electrical potentials is inevitable. The operation of the parasitic elements can also interfere with the circuit operation, leading to malfunction and even destruction. Therefore, uses which cause the parasitic elements to operate, such as applying voltage to the input terminal which is lower than the GND (P-substrate), should be avoided. ○ ○ Transistor (NPN) Resistor B (Pin A) P N N P P P N E C (Pin B) N GND P P N N N P substrate P substrate GND Parasitic element GND Parasitic element (Pin B) (Pin A) B C E Parasitic element GND Figure 17. ＧＮＤ Adjacent other elements Parasitic Example of Simple Structure of Monolithic IC Status of this document The Japanese version of this document is formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document formal version takes priority www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ 11/12 TSZ02201-0F1F0C100010-1-2 24. Jul.2012 Rev.002 Datasheet BD9478F ●Ordering Information B D 9 4 7 8 F Part Number - XX Package F:SOP Packaging and forming specification XX: Please confirm the formal name to our sales. ●Physical Dimension Tape and Reel Information SOP8 <Tape and Reel information> 5.0±0.2 (MAX 5.35 include BURR) +6° 4° −4° 5 1 2 3 0.9±0.15 6 0.3MIN 7 4.4±0.2 6.2±0.3 8 Tape Embossed carrier tape Quantity 2500pcs Direction of feed E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 4 0.595 1.5±0.1 +0.1 0.17 -0.05 S S 0.11 0.1 1.27 1pin 0.42±0.1 (Unit : mm) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111 15 001 ・ ・ Reel 12/12 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. TSZ02201-0F1F0C100010-1-2 24. 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