TPS63010.docx
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- 上传时间:2023-05-19
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TPS63010.docx
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TPS63010
TPS63010SignalsWaveform
PCBPicture:
ReferenceCircuit:
此Schematic為參考線路,不同於實際量測PCB之線路,此兩者差異如下:
1.零件編號不同.
2.實際PCB使用的LEDDriver是TPS63010.
3.VREF_P3P3V為16V,所以referencecircuit的R93,R98,R102由22K變為169K
4.R109is0.1ohm.
Note:
Thereare4levelsettingofLEDbrightness,“lev1”isnormal,“lev4”isbrightest.
SignalsWaveform:
●ThetimingofPowerSequence:
CH1:
SYS_PWR;CH2:
LEDDRV_ON;CH3:
LED_ANODE;CH4:
FB
◆SYS_PWRis3.3VforTPS63010,systemsupply3.3VwhenPicopoweron.
◆
LEDDRV_ONisLEDDriverTPS63010enablesignal,itgoeshighafterSYS_PWRabout1sec,it’scontrolledbyTIDDP2605.WhenDDP2605checkth“Systempowergoo”isOKthenenableLEDDriverTPS63010.
◆LED_ANODEisTPS63010outputpinfordrivingLED,Itwillactafter105usofLEDDriverEnable.
●FBandLED_ANODEoutputatsametimeafterenable.
R,G,B_STROBEandR,G,B_PWMoutputsignalafter700msofenable.
CH2:
LED_ANODE;CH3:
R_STROBE;CH4:
R_PWM
Picoframerateis60Hz,soR_STROBEisturnedon4timein16.7ms.
AndR_PWNalwaysoutputwhenit’sturnon,sameasG,B_PWM.
●
ThetimingofR_STROBE,G_STROBEandB_STROBE:
CH1:
LED_ANODE;CH2:
R_STROBE;CH3:
G_STROBE;CH4:
B_STROBE;
In16,7msfor1frame,LEDturnontimes:
R_LED:
4times.
G_LED:
4times.
B_LED:
2times.
ThetimingofR_STROBE,G_STROBEandB_STROBEisnotoverlap.
ChangeCH1tomeasureR109andMOSside.
Thereisa2.44usgapebetweenR_STROBE,G_STROBEandB_STROBEforturningoffandturningonLED.
Inthis2.44us,thevoltageofR109andMOSsideis0.
●
ThewaveformofR,G,BPWM:
CH1:
LED_ANODE;CH2:
R_PWM;CH3:
G_PWM;CH4:
B_PWM;
Setbrightnesstolev1:
Setbrightnesstolev4
TheperiodofR_PWM,G_PWMandB_PWMaresameas26.9us(37.17KHz),nomatterbrightnessis“lev1”or“lev4”.
ThedutyofR_PWM,G_PWMandB_PWMwillbechangedwhenbrightnesschange,thehighpulseislowerandbrightnessofLEDishigher.
InthisPico,thePWMsettingsofR,G,Baresimilar,sothecurrentR,G,BLEDsareclose.
●
TheR_LEDsignals:
CH1:
LED_ANODE;CH2:
R_STROBE;CH3:
R_PWM;CH4:
FB
Setbrightnesstolev1:
Setbrightnesstolev4
TheoutputvoltageforR-LEDis2.12V.
FBvoltageis0.5V.
TheoutputvoltageforR-LEDis2.76V.
FBvoltageis0.5V.
TheR_PWMperiodis26.9us,dutyofhighpulseis64.3%-35.7%.
TTheR_PWMperiodis26.9us,dutyofhighpulseis35.2%-64.8%.
MeasureR109,thevoltageis0.024V.
MeasureR109,thevoltageis0.076V.
●TheG_LEDsignals:
CH1:
LED_ANODE;CH2:
G_STROBE;CH3:
G_PWM;CH4:
FB
Setbrightnesstolev1:
Setbrightnesstolev4
TheoutputvoltageforG-LEDis3.36V.
FBvoltageis0.5V.
TheoutputvoltageforG-LEDis4.08V.
FBvoltageis0.5V.
TheB_PWMperiodis26.9us,dutyofhighpulseis64.3%-35.7%.
TTheB_PWMperiodis26.9us,dutyofhighpulseis35.2%-64.8%.
●
TheB_LEDsignals:
CH1:
LED_ANODE;CH2:
B_STROBE;CH3:
B_PWM;CH4:
FB
Setbrightnesstolev1:
Setbrightnesstolev4
TheoutputvoltageforB-LEDis3.4V.
FBvoltageis0.5V.
TheoutputvoltageforB-LEDis4.08V.
FBvoltageis0.5V.
TheB_PWMperiodis26.9us,dutyofhighpulseis63.9%-36.1%.
TTheB_PWMperiodis26.9us,dutyofhighpulseis33.8%-66.2%.
MeasureR109,thevoltageis0.024V.
MeasureR109,thevoltageis0.076V.
●
ThewaveformofR109voltagewithR,G,BLEDon/off:
CH1:
LED_ANODE;CH2:
R_STROBE;CH3:
G_STROBE;CH4:
B_STROBE;;Brightness:
lev4
R_LEDOffG_LEDOn
G_LEDOffB_LEDOn
B_LEDOffR_LEDOn
G_LEDOffR_LEDOn
Thereis2.46usgapebetweenoneLEDofftootherLEDon.
Whenbrightnessis“lev4”,thevoltageofR109is78mVwhenstable.
So,currentofR_LED,G_LEDandB_LEDaresame,is0.78A.
Whenbrightnessis“lev1”,thevoltageofR109is26mVwhenstable.
So,currentofR_LED,G_LEDandB_LEDaresame,is0.26A.
●
Thewaveformof74LVC1G315pin1andpin4.
CH1:
LED_ANODE;CH2:
B_STROBE;CH3:
pin1;CH4:
pin4;Brightness:
lev1
Pin1voltageis520mV.
Pin4voltageis510mV.
Changethebrightnessto“lev4”,
Pin4voltageisstill510mV.
●
PinL1,L2waveform:
CH1:
L2;CH2:
L1;Brightness:
lev1
ZoominofL1waveform:
CH1:
L2;CH2:
L1;Brightness:
lev1
ZoominofL1waveform:
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- 关 键 词:
- TPS63010