DEMONSTRATION NOTE. System Power Up

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1 Prepared by: Michael Bairanzade and Thierry Sutto ON Semiconductor Applications Engineering DEMONSTRATION NOTE INTRODUCTION This manual describes a possible application built around the NCP008 and NCP009. We thank you for choosing an ON Semiconductor part, and we hope this guide will help you to run our demo board. Please use the NCP009 data sheet as a reference source, document number NCP008/D, available through the Literature Distribution Center or via our website at Among the electrical parameters, the power supply must be capable to yield 00 ma minimum continuous DC current to operate the system properly. Peak current up to 00 ma can be developed when the driver operates at full power. General Demo Board Description The demo board comes fully assembled, ready to operate, on a. inches board. Included are all the functions needed to evaluate the NCP009 integrated circuit. The board requires only external DC voltage.7 V to 6.0 V. The associated micro controller includes the useful NCP008 and NCP009 routines to set up all the programmable functions. The board is split into five main sub circuits as follow:. The NCP009 area with test points and required passive components: U, L, C, C6, D7, R+R8, Q.. Four white LED: D7 to D0.. The supply connector (J) on the top left.. The amperemeter connector (J) on the right side.. The sub circuits command area: A. The selector (S) allows to select the Local mode or the digital programming mode. B. In local mode: the switch CS SELECT (bottom right) enables or disables the NCP009. C. In programming mode it s possible to choose the desired brightness value with the rotary dip switch on the left and to program this value with the push button PROG on the right. D. The entire passive component needed to set the programming sub circuit. E. Low current LEDs (I f = ma) are used to display the desired mode. Equipment List to Evaluate the Circuit DC Lab power supply (typical:.6 V/00 ma) Amperemeter (not mandatory to operate the system) System Power Up DUE TO THE HIGH LED LUMINOSITY, DO NOT LOOK DIRECTLY AT THE LED, AS IT MAY CAUSE SOME DAMAGE TO YOUR EYES. CARE MUST BE OBSERVED TO AVOID DIRECT VIEW OF THE HIGH INTENSITY LED.. Adjust your power supply output at.6 V (if a current limit circuit is present, set it at 00 ma).. You must connect two cables: The power connector: with polarity respect, plug the two wires extremities into the lab power supply. The amperemeter connector: with polarity respect, plug them into the amperemeter. Preset the amperemeter in DC current, 0 ma range.. Rotate the potentiometer (R8) to the middle position.. Make sure that: S jumper is set between and in order to disable the photo sense feedback in a first way; S jumper is set between and in order to measure with the amperemeter the current through the LEDs; S is set to in order to select the Local mode; Put CS SELECT switch set to the down position in order to disable the NCP009 (logic = high) At this point you can plug the power cable supply on the power supply. The LEDs diodes will be activated accordingly. Local ON Red LED, Mode LOCAL is selected. CSlocal = ON Red LED, Chip Select is set at high level. Semiconductor Components Industries, LLC, 00 May, 00 Rev. 0 Publication Order Number: NCP008DEMO/D

2 Jumper Photo Transistor Selector: Jumper : Photo transistor disabled Jumper : Photo transistor enabled Potentiometer R8 to set the max peak output current in the inductor. Photo Transistor Analog Input Capacitor NCP009 Inductor White LEDs Power Supply Plug Output Capacitor Test Points Operating Mode Selection Mode Selection: Local µp Amperemeter Plug Digital Rotary dip to define the desired value (0 to 9) to be programmed Chip Select status in Local mode: CSlocal = Disable CSlocal = 0 Enable Push button to program the desired value in programming mode. Jumper Amperemeter Selector: Jumper : LEDs connected to Jumper : LEDs connected to through the Amperemeter Chip Select switch in Local mode: Top CS = Enable Bottom CS = Disable Test Points List Vin Connected to power supply Power/Analog VL Connected to NCP009 pin L Power/Analog Vout Connected to output load Power/Analog CS Connected to NCP009 pin CS Digital CLK Connected to NCP009 pin CLK Digital Figure. Demo Board Overview DETAILED DESCRIPTION The NCP009 evaluation board requires.7 V to 6.0 V input voltage range (). The board can drive up to V for the LED output. The current through LEDs must not exceed the maximum output current allowed for the existing white LED. The white LED used has the following characteristic: typical current 0 ma with a maximum at 0 ma. The maximum peak current in the inductor is set with the potentiometer (R8). This demonstration board allows to select two different modes, the Local or the Remote mode. Local Mode The NCP009 is set in local mode when the Local pin is connected to the ground and a Power On Reset (POR) is done. The chip is turned ON/OFF by means of the CS line, the DATA and CLOCK pins being deactivated. How To Do It on the Demonstration Board. Switch off the power supply.. Place the switch S in position.. Switch ON the power supply. The Local LED diode is activated, and the NCP009 is initiated in Local mode. At this point, the product can be controlled directly by the switch CS SELECT: If CS is disable (LED CSlocal = ON) then the NCP009 is in shut down. If CS is enable (LED CSlocal = 0 ON) then the NCP009 works normally and regulates the current through the white LED according to the peak current adjusted in the inductor with R8 (see chapter Output peak current definition:).

3 Remote or P Mode The NCP009 is set in Remote mode (µp controlled) when the Local pin is not connected or left open. The chip is now controlled by the two digital lines: CS and CLOCK. The output current is programmed by the logic control of these pins, allowing a current adjustment within the range defined by R8. How To Do It on the Demonstration Board. Switch off the power supply.. Place the switch S in position.. Switch ON the power supply. The µp LED diode is activated, and the NCP009 is initiated in µp mode. After the POR, the device start in shut down mode forcing the white LEDs in the stand by mode. A programming sequence is necessary to activate the white LEDs. Switches and Jumpers Selection Switch S allows the selecting between the two different modes: LOCAL and REMOTE (or µp). Switch CS SELECT enable or disable the chip in Local mode. The digital content of the rotary switch is used by the system to define a new luminosity upon a press on the push button PROG. Jumper S: it can be selected to enable or disable the photo transistor: S Short Between Photo Pin & Connected to Disable & Connected to Photo Transistor Enable Photo Transistor Status Jumper S: it allows connecting or disconnecting the amperemeter. The amperemeter senses the current through the white LEDs. S Short Between Amperemeter Measure & Shunted/ Not Mandatory 0 ma & Mandatory The current in the white LEDs Output Peak Current Definition The details of the calculation are defined in the data sheet NCP008/NCP009. The output peak current reference through the inductor is: Ipeak_ref (Iref Iphoto) (Bn 0.) k where: k = 76; Iref is the current sunk to ground on pin I REF fixed with the R8 & R; Iphoto is the current sunk to ground on pin PHOTO fixed with the phototransistor; Bn the programming value: Bn = {,,,,, 6, 7}. In fact, the peak programming current settles the average current in the white LEDs according to the white LEDs forward voltage. PROGRAMMING SEQUENCE Figure depicts the programming sequence to program B value. In fact, the number of clock count during the active CS defines the programming value. The chip comes back in shut down mode, when the CLK count is upper than 7 during the active CS. With the demonstration board the V BIAS pin is directly connected to via a pull up resistor. The rotary dip allows to program ten codes defined as follow: Code # Program Value 0 8 CLK count Shut down mode Bn = or B Bn = or B Bn = or B Bn = or B Bn = or B 6 Bn = 6 or B6 7 Bn = 7 or B7 8 8 CLK count Shut down mode 9 Sequence: Shut down B B B B B B6 B7 shut down B For more detail of the programming sequence refer to the data sheet of the NCP008/NCP009.

4 tcssetup CS CLEAR tclear CLK Qdata B B B B B Last latched bit B6 B7 Iout ref Output Current Programmed Register Internal Latch Data & Reset Ioutdly Iout Figure. Programming Sequence Example OSCILLOGRAMS Figure. B Programming Sequence Figure shows a B programming sequence. During the active CS, the CLK count is yielding a programmed B value. Figure. Start Up Programming Sequence Figure shows the internal ON voltage settles at pin Iref, when the device starts up.

5 Figure. Programming Shut Down Sequence Figure shows the internal OFF voltage settles at pin Iref, when the device comes back into shut down mode. Figure 7. Inductor Current Measure on the Internal Sense Resistor Figure 7 conditions: Vin =.6 V; Cin = 0 µf/6. V; Vout =.0 V; Iout = 0 ma; Cout =. µv/6 V. The inductor current can be measured directly on the internal sense resistor between pin and L (see the block diagram in the NCP008/NCP009 data sheet). The peak current can be estimated with the following relation: Ipeak V RSENSEpeak RSENSE Ipeak 7 mv.8 Ipeak 07 ma Figure 6. VoutRipple and VL Figure 6 conditions: Vin =.6 V; Cin = 0 µf/6. V; Vout =.0 V; Iout = 0 ma; Cout =. µv/6 V; and Bn = 7. Figure 6 depicts the switching frequency of the boost is 8 khz (measured on pin L/Iout), and the Vout ripple directly measured on the output capacitor, the ripple is mv with a. µv/6 V capacitor. Depending upon the maximum allowable ripple voltage, the output capacitor can be adjusted accordingly. Figure 8. Vin Ripple Figure 8 conditions: Vin =.6 V; Cin = 0 µf/6. V; Vout =.0 V; Iout = 0 ma; Cout =. µv/6 V. With a 0 µf capacitor connected directly to the battery voltage ripple is lower than mv (see Figure 8). Depending upon the maximum allowable ripple voltage, the input capacitor can be adjusted accordingly.

6 SCHEMATICS VL TP L J Power Supply S JMP Q NPN PHOTO Vin TP 0 C 0 µf/6. V R8 00 k R k U NCP009 R 0 k PHOTO Iref VBIAS R9 7 R 9 L CS CLK µh L/Iout LOCAL R0 7 R D6 MBR00 LOCAL C6. µf/6 V Vout TP D7 White D8 White D9 White D0 White CS CLK CS TP CLK TP J Amperemeter S JMP Figure 9. NCP009 Schematic 6

7 U CODEUR DCB C C 8 C7 00 nf 6 D N8 R k C 68 nf R 0 k R 60 R Y 0 MHz C pf RA0 RA RA RA C pf RA/MCLR U PIC6F67 0I Vdd RB/CK RB/DT RB0/INT RB7/TOSI RB6/TOSO/TCKI RA/TOCKI/CMP RA7/OSC RB RB/PGM RA6/OSC Vss RB/CCP U MC7VHCG CLKµP CSµP Start R.0 k C.0 nf S7 PROG R.0 k D U N8 MC7VHCG Start D N8 Figure 0. Remote or P Command Sub Circuit R6. k D CSlocal = 0 D CSlocal = 6 S CS SELECT CSµP CLKµP R 0 k S SLIDE P > V CS CLK LOCAL R7 D µp. k D Local Figure. Selector Local/Remote Control and CS Command in Local Mode 7

8 BILL OF MATERIALS Designator Part Type Footprint Description Preferred Supplier C 68 nf 06 Capacitor Generic C pf 080 Capacitor Generic C pf 080 Capacitor Generic C.0 nf 080 Capacitor Generic C 0 µf/6. V 080 Capacitor, GRM0 XR 06K 6, Murata C6. µf/6 V 06 Capacitor, GRM 6 X7R K 6 Murata C7 00 nf 080 Capacitor Generic D N8 SOD Signal diode, MMSD8T ON Semiconductor D CSlocal = 0 LEDMM Green LED diode, IF =.0 ma Generic D CSlocal = LEDMM Red LED diode, IF =.0 ma Generic D µp LEDMM Green LED diode, IF =.0 ma Generic D Local LEDMM Red LED diode, IF =.0 ma Generic D6 MBR00 SOD Schottky diode, MBR00 ON Semiconductor D7 White LEDMM LED diode, LW VBW Osram D8 White LEDMM LED diode, LW VBW Osram D9 White LEDMM LED diode, LW VBW Osram D0 White LEDMM LED diode, LW VBW Osram D N8 SOD Signal diode, MMSD8T ON Semiconductor D N8 SOD Signal diode, MMSD8T ON Semiconductor CAV SHUNT CAV SHUNT J Power Supply J STD Connector J Amperemeter J STD Connector L µh 0 Inductor, LQHC0K Murata Q NPN PHOTO PLCC Photo Transistor, SFH0 Osram R 0 k BCN6 A Network resistor R 60 R 080 Generic R k 080 Generic R 0 k 080 Generic R.0 k 080 Generic R6. k 080 Generic R7. k 080 Generic R8 0 k TRIM CMS Potentiometer Generic R9 7 R 080 Generic R0 7 R 080 Generic R k 080 Generic R 0 k 080 Generic R 0 k 080 Generic S JMP Jumper Generic 8

9 BILL OF MATERIALS (continued) Designator Part Type Footprint Description Preferred Supplier S JMP Jumper Generic S CS SELECT Switch Double poles Generic S SLIDE P > V DIP6 P Slide Switch poles tracks Generic S7 PROG Button CMS Push Button Generic TP Vin TEST POINT Test Point Generic TP VL TEST POINT Test Point Generic TP Vout TEST POINT Test Point Generic TP CS TEST POINT Test Point Generic TP CLK TEST POINT Test Point Generic U NCP009 MSOP0 LED Driver ON Semiconductor U CODEUR DCB DIP6 P Rotary DIP Generic U MC7VHCG TSOP /SOT Schmitt Trigger Inverter MC7VHCGDT or DF DT suffix: case TSOP /SOT DF suffix: case SC 88A/SOT U MC7VHCG TSOP /SOT Schmitt Trigger Inverter MC7VHCGDT or DF DT suffix: case TSOP /SOT DF suffix: case SC 88A/SOT ON Semiconductor ON Semiconductor U PIC6F67 0I DIP8 P Micro Controller Microchip Y 0 MHz HC9/HSMX Crystal Generic 9

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12 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 6, Denver, Colorado 807 USA Phone: or Toll Free USA/Canada Fax: or Toll Free USA/Canada ONlit@hibbertco.com N. American Technical Support: Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center Nishi Gotanda, Shinagawa ku, Tokyo, Japan 00 Phone: r@onsemi.com ON Semiconductor Website: For additional information, please contact your local Sales Representative. NCP008DEMO/D