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This collection of simulations are design ideas that demonstrate circuits using Zetex solutions.

The circuits can be used as an aid before actual build of the circuit. However, as with all simulations not all aspects of real circuit performance is modeled and care should be taken with interpretation.

Part number Application area
 Circuit description Circuit notes down load Associated documents Download schematic
 FMMT2369A
 FMMT617
 FMMT618
 Power Management AN18_A Circuit shows a method of maintaining the correct drive level and drive phase, when deriving a control signal from a 5V logic based controller, by driving the emitter of a fast switching pre-driver transistor, FMMT2369A The transient simulation itime is 600us. The emmitter Voltage and gate drive are monitored. current are monitored   AN18 Register to
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 FMMT49
 FMMT591
 Power Management AN18_B Circuit shows a level shifted driver for a PMOS device. The turn on speed is controlled by resistors R1 and R3. Q3 acts as a level shifter and an inverter of the control input signal The transient simulation itime is 1ms. The emmitter Voltage and gate drive are monitored. current are monitored   AN18 Register to
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 ZXCT1009 Power Management AN39-1-Fig-10A-1009 The design shows a ZXCT1009 used to implement a current monitor that operates with over-voltage well above the rated 20V without suffering damage. The simulation is a transient one run over 1ms with a supply that ranges from 0 to 60V. The input voltage, Output voltage and level shifted output voltage are monitored AN39-1-Fig-10x-1009 AN39 Register to
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 ZXCT1009 Power Management AN39-1-Fig-10B-1009 The design shows a ZXCT1009 used to implement a circuit that is protected against transient voltages of up to 400V amplitude. The simulation is a transient one run over 1ms with a voltage spike of 400V 4µs on top of a 20V supply. The input voltage, Output voltage and level shifted output voltage are monitored AN39-1-Fig-10x-1009 AN39 Register to
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 ZXCT1009 Power Management AN39-1-Fig-6-1009 The design shows a ZXCT1009 used to implement a basic current monitor. The simulation is a transient one run over 1ms with a supply varying from 0 to 20V. Vin, output current and output voltage are monitored AN39-1-Fig-6-1009 AN39 Register to
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 ZXCT1010 Power Management AN39-1-Fig-12-1010 The design shows a ZXCT1010 used to implement a 200V high side current monitor by "standing" it on a high voltage transistor. Two versions are shown side by side. One with a constant current load demonstrating the good common mode rejecton capability, the other with a resistive load showing linearity. AN39-1-Fig-12-1010 AN39 Register to
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 ZXCT1030 Power Management AN39-1-Fig-22-1030 The design shows a ZXCT1030 used to implement a precision electronic fuse or latching over-current monitor. The simulation is a transient one run over 10ms with a current that ramps up from 0 until the circuit finally trips around 180mA. Several key points are monitored AN39-1-Fig-22-1030 AN39 Register to
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 ZXCT1041 Power Management AN39-1-Fig-14-1009 The design shows a ZXCT1041 used to implement a bidirectional current monitoring applicaiton. The simulation is a transient one run over 1ms with the current alternating between ±100mA. The Vin Flag and Vout are monitired AN39-1-Fig-14-1009 AN39 Register to
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 ZXCT1050 Power Management AN39 Fig 29 The design shows a ZXCT1050 used to implement a current monitor that operates at a higher supply voltage than 20V (30V) and still has a common mode range that includes ground. The simulation is a transient one run over 1ms. Several key points are monitored   AN39 Register to
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 ZXLD1350 Lighting DN83 The design shows a ZXLD1350 driving up to 3 LED's at 300mA from and input Voltage of 12Vac or 12Vdc. R1 is a thermistor and varies from 10k at 25C to about 1.5k at 70 C.As soon as R1 decrease the emitter follower Q1 starts to sink current from the ADJ pin reducing the LED current and hence the temperature. The transient simulation itime is 2ms. The Sense voltage and Voltage and LED current are monitored   DN83 Register to
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 ZXLD1350 Lighting DN86 The design shows a ZXLD1350 driving 3 LEDs at 300mA from 12Vac or 12Vdc as an MR16 replacement   DN86 Register to
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 ZXLD1350 Lighting AN48_1A This design shows a ZXLD1350 and external bipolar devices driving up to 6 leds in series at 1A from a 30V supply.   AN48 Register to
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 ZXLD1350 Lighting AN48_700mA This design shows a ZXLD1350 and external bipolar devices driving up to 6 leds in series at 700mA from a 30V supply.   AN48 Register to
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 ZXSC310 Lighting AN44 The design shows the ZXSC310 configured as a buck convertor, driving 3 LEDs at about 300mA from a 12V input.   AN44 Register to
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 ZXSC310 Lighting DN67. This design shows a ZXSC400 driving a 1W led at a nominal 350mA from a 3V input. The transient simulation itime is 1ms. The Sense voltage and Voltage feedback pins are monitored   DN67 Register to
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 ZXSC310 Lighting DN73 Design shows ZXSC310 driving a 3W LED in buck mode. The input voltage ranges from 3.8V to 6.2V with a maximum output current of 1.11A at 6V input. The transient simulation itime is 1ms. The Sense voltage and Voltage and LED current are monitored   DN73 Register to
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 ZXSC310 Lighting DN75 This circuit shows a ZXSC310 LED driver circuit for a solar powered garden light. The design shows the output current holding up as the input Voltage decays below .5V, with an output current of about 45mA at 1V input. The transient simulation itime is 2ms. The Sense voltage and Voltage and LED current are monitored   DN75 Register to
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 ZXSC310 Lighting DN78 The ZXSC310 and transistor Q1 can be damaged if the battery is put in the flashlight the wrong way. Circuit shows a method of reverse protection for the ZXSC310 by adding current limiting resistor and Schottky diode. The transient simulation itime is 2ms. The Sense voltage and Voltage and LED current are monitored   DN78 Register to
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 ZXSC310 Lighting DN69 The schematic shows a ZXSC310 driving 4 LED in parallel. The input voltage ranges from 1.7V to 2.5V with maximum output current of 160mA at 2.4V input. A pwm signal is applied to the Ven input. The transient simulation itime is 10ms to show the pwm signal. The Sense Voltage and current through 1 LED are monitored.   DN69 Register to
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 ZXSC310 Lighting DN61 The circuit shows the ZXSC310 LED driving a 1W LED. The solution is optimized to drive the 1W LED at 350mA DC current from a dual cell input. PWM is applied to the Ven pin to adjust the brightness without changing the colour. The transient simulation time is 20ms to show the pwm effect. The Sense Voltage, LED current and PWM driveVoltage are monitored.   DN61 Register to
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 ZXSC310 Lighting DN62 This design shows a ZXSC310 driving 3 LEDs at between 8 and 15mA as the input Voltage varies from 3V to 4.3V. The transient simulation runs for 1ms. The Sense Voltae pins and LED current are monitored   DN62 Register to
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 ZXSC310 Lighting DN63 The deisign uses a ZXSC310 to drive 8 white leds in seriesand is optimized for an input voltage range of 3.5V to 4V. The LED current is set to approximately 25mA at 4V input voltage . A pwm wave form applied to the Ven pin reduces the average LED current without changing the colour. The transient analysis runs for 5ms. The Sense Voltage and LED current are monitored.   DN63 Register to
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 ZXSC310 Lighting DN64 The design is a flashlight example using a ZXSC310 to drive 4 white leds at about 20mA from a 2 cell input. The transient simulation itime is 1ms. The Sense Voltage and LED current are monitored   DN64 Register to
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 ZXSC310 Lighting DN65 This solution iuses a ZXSC310 driving 8 white LEDs connected in series at about 20mA from a 4 cell input for an emergency light. The transient simulation itime is 2ms. The Sense Voltage and LED current are monitored   DN65 Register to
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 ZXSC400 Lighting DN67 The design shows a ZXSC400 driving a 1W led at a nominal 350mA from a 3V input The transient simulation itime is 1ms. The Sense voltage and Voltage feedback pins are monitored   DN67 Register to
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 ZXSC400 Lighting DN70 The design shows a ZXSC400 driving a 1W LED at about 350mA with current control. The transient simulation itime is 5ms. The Sense Voltage and Voltage feedback pins are monitored   DN70 Register to
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 ZXSC400 Lighting DN71 The design shows a ZXSC400 driving 2 1W LEDs at about 700mA from 3V with current control. The transient simulation itime is 5ms. The Sense voltage and Voltage feedback pins are monitored.   DN71 Register to
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 ZXSC400 Lighting DN84 The design shows a ZXSC400 driving a 3W led with low loss current control. The transient simulation itime is 2ms. The Sense Voltage, feedbackVoltage and LED current are monitored   DN84 Register to
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 ZXSC400 Lighting DN85 The design shows a ZXSC400 cnfigured as a buck convertor driving a 3W LED at 350mA. The transient simulation itime is 5ms. The Sense voltage and Voltage and LED current are monitored   DN85 Register to
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Applications disclaimer

The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user’s application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use of these circuit applications, under any circumstances.