iC-WJ, iC-WJZ APPLICATION NOTES Sep 19 2000, Page 1/3 LASER DIODE OUTPUT WAVEFORMS Fig. 1: the lowest operating frequency permitted is determined by a limit of 10% max. overshooting Fig. 2: setup ok, the time constant given by RSET x CI suits the operating frequency ideal Fig. 3: switch delay on leading edge starts to effect the duty cycle and thus the pulse power TYPICAL OPERATIONAL CHARACTERISTICS (taken on iC-WJ) Operating Conditions: VCC= 5V, Tj= 25EC, unless otherwise noted Item Symbol Parameter Conditions Tj Fig. EC Unit Min. Typ. Max. CW Operation (IN= VCC) 1 ton() Power-on Delay CI, RSET, CWD: 22nF, 15k, -pF 0.54 ms 2 470nF, 15k, 100pF 11 ms 3 4.7µF, 15k, 1000pF 120 ms Operating Frequency (50% duty cycle) 4 f(IN) Clock Frequency at IN CI, RSET, CWD: 100nF, 15k, - pF 1 65 kHz 5 see #4 2 150 kHz 6 see #4 3 400 kHz 7 220nF, 15k, -pF 1 8 see #7 2 30 120 150 kHz 250 kHz 9 see #7 3 400 kHz 10 470nF, 15k, 100pF 1 10 kHz 11 see #10 2 12 see #10 3 400 kHz 13 4.7µF, 15k, 1000pF 1 1.8 kHz 14 see #13 2 15 see #13 3 60 30 100 100 350 250 250 kHz kHz kHz iC-WJ, iC-WJZ APPLICATION NOTES Sep 19 2000, Page 2/3 TYPICAL OPERATIONAL CHARACTERISTICS (taken on iC-WJ) Operating Conditions: VCC= 5V, Tj= 25EC, unless otherwise noted Item Symbol Parameter Conditions Tj Fig. EC Unit Min. Typ. Max. Operating Frequency (25% duty cycle) 16 f(IN) Clock Frequency / Pulse Width at IN 17 18 470nF, 50k, - pF 1 see #16 2 40 6.2 50 kHz µs 5 80 kHz µs see #16 3 100 2.5 kHz µs 1µF, 100k, 1nF 1 5 10 kHz µs see #19 2 Operating Frequency (10% duty cycle) 19 f(IN) Clock Frequency / Pulse Width at IN 20 21 see #19 3 10 5 30 kHz µs 50 2 kHz µs Laser Diode Power Delay | | 22 tp(LD)on Light Power Delay IN: lo hi until 90% Popt 230 ns 23 tp(LD)off IN: hi lo until 10% Popt 90 ns iC-WJ, iC-WJZ APPLICATION NOTES Sep 19 2000, Page 3/3 C1 10µF 1 GND KLD 8 C3 5nF R1 12 LD MD AMD 2 7 CWD CI 100nF 3 RSET 10k 4 WDOG CI IN +5V +5V 6 R8 100 R5 REF ISET IN VCC 5 iC-WJ/WJZ +5V C2 100nF R6 R10 R11 +5V + R7 eg. RSET x10 modulation depth Fig. 1: applying external HF modulation Fig. 2.: supplying higher output currents R9 50