- Cap-XX
Contents
1. the use of supercapacitors in any application Please use the contact details on the header page or visit the cap XX web site All information contained herein is strictly confidential APPEB1006 User Manual rev1 0 31 May 2005 page 4 of 6 CAP XX Pty Limited 2005 CAP X Schematics J1 bd ve 1 2 4 S a tc toa T Ta Vbattery 10u 10u 10u 1V2 805 805 805 R1 R2 M1 J3 82k FDC638P 1 805 R3 SuperSOT 6 p 33k GND ATK 805 805 R37 U2B 150 805 R8 18k 805 R14 TS1852 47k 805 R13 1e6 805 Undervoltage Lockout Vmin 3 1V with 350mV Hysteresis Vout 62 ca G 10u 10u Gw101 805 805 MBRA130LT3 Vin L1 J2 SMA ionom 19 oe Di c7 C8 C9 Ense Inductor Current D3 10u DNP 10u DNP idu R6 805 805 805 3R3 805 a1 R7 d AW EM Vdrive 3 L ZeTtSNSDDES 805 Torch Vout BAS GND AW 6 SOT23 6 a L3 E 33k Isense M2 FDV302P So M SOT23 J4 R12 500k 2_T93YB 3v FDV302P Boost Disable R1 SOT23 14k3 805 805 3 RT 2k 2 T93YB All information contained herein is strictly confidential APPEB1006 CAP XX Pty Limited 2005 User Manual rev1 0 31 May 2005 Vin Vout Vbat U3 3v D1 D2 LSR976 K 2 LYR976 i w 805 w 805 805 1V2 TC1185 BOS R4 R5 SOT23 A 2 U4 12. volts and the Boost is not operating However depending on the LED current required there may not be enough voltage headroom in Vout when the battery nears its end voltage 3 3V For example if the LED current was chosen to be 200mA and the voltage across a typical LED at this current was also 3 3V then there would be no volts available across the current sense resistor R22 and M4 and then only say 150mA would be available Option b is factory chosen and the TORCH current is set to 100mA All information contained herein is strictly confidential APPEB1006 User Manual rev1 0 31 May 2005 page 3 of 6 CAP XX Pty Limited 2005 C AD L Loa L A Pe The user must decide on what is the end voltage of the Li ion battery and what current gives acceptable light for the Torch Of course the user may also decide that it is acceptable to have slightly less light output as the battery nears its end voltage after all most users are familiar with this behavior in an incandescent torch Current Control The FLASH current is factory set to 1 0 Amp It can be reduced by turning R25 10k pot anti clockwise The maximum LED current rating is 2 Amps The FLASH current needs to be adjusted prior to the TORCH current because the FLASH setting affects the TORCH setting but not vice versa The TORCH current is factory set at 100mA It can be reduced by turning R26 2k pot anti clockwise External Flash LED An External white LED or other load can b
3. 1006 User Manual rev1 0 31 May 2005 page 2 of 6 CAP XX Pty Limited 2005 Boost Converter J2 needs to be jumpered for normal operation This jumper has been included so a wire loop can easily be inserted to measure the inductor current By measuring the inductor current and monitoring the base drive voltage of Q1 the current through Q1 D3 and supercap can also be determined J4 is not jumpered during normal operation This jumper has been included to manually disable the boost if required If jumpered it forces the feedback voltage at pin 6 of the boost to be 3V which is gt gt than the 730mV of the internal reference thereby instructing the boost to cease switching The boost can also be disabled by pulling the gate of M3 low This can be done automatically during a FLASH pulse by jumpering J7 or while in TORCH mode by jumpering J10 The advantage of disabling the boost during a FLASH pulse is that the maximum battery current is equal to the load flash LED current however the disadvantage is that the supercap discharge current is also equal to the load current and it will discharge at a faster rate than if the boost was enabled The disadvantage of enabling the boost during a Flash pulse is that the maximum battery current is greater or much greater then the load current depending on the current limit set on the boost FLASH MODE The boost generates an output voltage Vout that is gt the battery voltage For FLASH mode Vout is fa
4. User s Manual Camera Phone Flash Evaluation Board APPEB1006 CAP X wieder 950 MN DUO All information contained herein is strictly confidential APPEB1006 User Manual rev1 0 31 May 2005 page 1 of 6 CAP XX Pty Limited 2005 Camera Phone Flash Evaluation Board User s Manual Board Features FLASH mode with adjustable voltage and current TORCH MOVIE mode with adjustable voltage and current Vin and Vout indicating LED s On board or External triggering On board or External white LED LED and inductor current measurement ability Undervoltage lockout UVLO Boost enable disable during flash and torch for different power architectures Auto run for flash or torch Quick Setup The following jumpers should be in place J2 J5 J7 J8 and J10 Connect the positive terminal of a single cell Lithium lon rechargeable battery 3 3V 4 2V to any pin on J1 and connect the negative terminal to any pin of J3 The red LED D1 should come on immediately and the yellow LED D2 should increase in brightness over a few seconds whilst the supercapacitor charges up When the TORCH push button SW1 is pressed 100mA will flow through the white LED D5 At 100mA the button can be held down continuously When the FLASH push button SW2 is pressed 1A will flow through the white LED D5 for approximately 80ms If the button is held down continuously the flash will retrigger approximately every 2 5s This duty cycle is imposed due to the t
5. ctory set to 5 7V This voltage can be increased by turning R17 a 2k pot anticlockwise Care must be taken if this voltage is increased not to overvoltage the supercap ie the supercap voltage will be Vout minus the voltage of the battery For maximum supercapacitor life the voltage should be kept below 2 3V however short term overvoltages seconds may go up to 2 7V TORCH MODE The continuous current required for TORCH is lt lt FLASH current typically 100mA Vs 1A Therefore the voltage dropped across the LED will be less To increase efficiency and to reduce thermal stress on the current limiting MOSFET M4 Vout should also be reduced There are two options for the TORCH Vout if constant high output light is more important than efficiency then option a should be chosen a In this option the Boost is enabled with J10 removed and J11 is jumpered Vout can be adjusted using R12 a 500k pot Vout is factory set to 4 2V This means that Vout will always be Vin irrespective of the battery voltage In this mode the forward voltage to drive the LED at 200mA for example will always be available even when the battery nears its end voltage 3 3V b In this option the Boost is disabled with J10 jumpered and J11 is don t care This means Vout will always be equal to Vin minus the drops incurred by the inductor s L1 DC resistance and D3 This is the most efficient mode because the current limiting MOSFET M4 does not have to drop as many
6. e connected to the board via J5 This also requires that the on board LED D5 be bypassed with J6 Alternatively a second flash LED LXCL PWF 1 can be connected in parallel to D5 across J6 pin 2 is ve AutoTorch External Torch Mode Control If J12 is jumpered then Torch mode will be permanently on Auto Torch Alternatively an external control signal connected to pin 2 of J12 will select Torch mode when Hi 3V 5V This logic signal drives the gates of M8 M9 and M10 and must source 0 1mA to develop 3 3V across R36 Flash PulseTimers External Flash Pulse Control There are two on board 555 timers One generates the FLASH on time and the other generates the off time The FLASH trigger from these timers is connected to the Current Control circuitry via J8 J8 is jumpered for normal operation An external triggering circuit can be connected by removing the jumper from J8 and connecting the external signal to pin 1 of J8 There is a 33k pull down resistor on this pin A logic high signal on this pin will take a FLASH Make sure that this signal is 100ms long and does not occur for at least another 2s otherwise the thermal limits of the white LED D5 will be violated and it will be destroyed Auto Flash If J13 is jumpered then the two 555 timers will be continuously triggered to generate an 80ms flash pulse every 2 5s Further Information CAP XX will be pleased to provide further information on the applications described here and on
7. hermal constraints of the white LED Circuit Description refer to schematics at the end of this manual Input Voltage The circuit is designed to operate from an external Li ion battery 4 2V 3 3V Vbat is the node connected to the battery via J1 J1 is to be connected to battery positive terminal Pins 1 and 2 of J1 are joined J3 is to be connected to battery negative terminal Pins 1 and 2 of J3 are joined An undervoltage lockout UVLO has been included U2B such that when the battery voltage drops below 3 1V the main switch MOSFET M1 opens It will reclose with 350mV of hysteresis 3 45V The 3V regulator remains operational during a UVLO The main reason for the UVLO is that the boost controls Vout which is the sum of the input voltage battery or perhaps bench top supply plus the supercap C1 voltage The voltage across the supercap is not measured Therefore if the input voltage was say 3V and Vout was controlled to be 5 7V then the supercap would be at 2 7V which reduces its life For maximum life the supercap should be kept below 2 3V However the supercapacitor voltage can be increased to 2 5V for short periods such as while taking flash photos without affecting life Indicating LED s D1 is a red LED that indicates a source voltage is present and that a UVLO has not occurred D2 is a yellow LED and indicates that Vout is present and above approximately 5V All information contained herein is strictly confidential APPEB
8. k 1k 805 805 Vbat genet e C13 E Ka D4 10u ES BZX84C 4V7 _ 805 SOT23 3v LEDpulse C16 C17 3v 10u 100n R28 805 805 C18 220k 100n 805 US _ 805 R29 3v AWW C19 R30 100n 33k 805 805 805 C21 TLC556CD SOIC 3v Offtime Trigger D6 as ae AW BAT754 R33 ow SOT23 33k 805 sw2 Flash B3SN R34 3k3 J13 805 1 2 R35 33k Auto Flash 3v 805 page 5 of 6 CAP X Vout Boost Disable J5 lo o LED Current D5 J6 ne 1V2 a v LumiLED o LED Bypass OQ Pulse Boost Disable K 9 c14 x S c 100n 805 R20 R21 805 M5 4 ZXM64NO2X AN la MSOP8 4 FDV301N 150 H 805 TT zd l o 3v_ T R22 Offtime Trigger R047 805 3 R25 3 R26 3k3 10k 2k 805 2_T93YB 2 T93YB R27 1v2 LEDpulse J8 Pulse M7 1 1 AW 25 ol 4 l FDV301N i ims External Timer R31 33k FDV301N 805 M8 Ps Boost Disable E Torch Vout FDV301N Sw1 a d T ES Torch Flash mo H CR R o B3SN Torch o Torch Boost Disable o Torch Voltage FDV3OIN J12 2 o2 Auto Torch d M10 FDV301N R36 4 33k zl 805 All information contained herein is strictly confidential CAP XX Pty Limited 2005 APPEB1006 User Manual rev1 0 31 May 2005 page 6 of 6
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