introduction scg? new mc33370 series are monolithic high voltage power switching regulators that combine the required converter functions with a unique programmable state controller, allowing a simple and economical power system solution for office automation, consumer, and industrial products. these devices are designed to operate directly from a rectified ac line source and are capable of providing an output power in excess of 150 w with a fixed ac input of 100 v, 115 v, or 240 v, and in excess of 90 w with a variable ac input that ranges from 85 v to 265 v. this device series features a programmable state controller, an on-chip 700 v sensef et power switch circuit, 700 v active off-line startup circuit, auto restart logic, fixed frequency duty cycle controlled oscillator, current limiting comparator with leading edge blanking, latching pulse width modulator for double pulse suppression, and a high gain error amplifier with a bandgap reference. protective features include cycle-by-cycle current limiting, input undervoltage lockout with hysteresis, and thermal shutdown. these devices are available in economical five pin to-220 and dip-8 style packages. semiconductor components group analog, logic and discretes mc33369 thru mc33374 very high voltage off-line power switching regulators unique state control function to implement multiple on/off methods of the power converter order this publication as pb33370/d 01-july-1999 rev. 1
page 2 features & advantages ? ? programmable state controller to implement 4 methods of on/off control of the converter ? ? on-chip 700 v sensefet po wer switch circuit ? ? rectified ac line source operation from 85 v to 265 v ? ? on-chip 700 v active off-line start-up circuit ? ? latching pwm for double pulse suppression ? ? cycle-by-cycle current limiting ? ? input undervoltage lockout with hysteresis ? ? internal thermal shutdown ? ? enhanced functionality over competitive series types of applications ? ? consumer electronics: set-top decoders, vcrs, small screen tvs, dvds,video games, audio entertainment, satellite receivers. ? ? office automation: copy machines, faxes, point of sales. ? ? personal computers: inkjet printers, cable modems, external peripherals, multimedia audio, notebook ac/dc adapters, usb power supply, iapc (instantly available pc) initiative- compliant pcs, scanners. ? ? wireless communication: base station of cordless phones, cellular phone ac/dc adapters, battery chargers. ? ? industrial & residential: appliances, battery chargers, utility meters, cable distribution, terminals, ups (uninterruptible power supplies), industrial control, pfc (power factor control).
page 3 programmable state controller startup circuit pulse width modular controller power switch circuit snubber feedback input v cc ground power switch + + + + + dc output 2 1 5 state control input on/off 4 3 ac input customer benefits ? ? simplified interface allows on/off control by a microcontroller or other circuitry. ? ? lower system cost with reduced component count for a total converter system solution. ? ? improved reliability with internal thermal shutdown protection, cycle-by-cycle current limiting, and input undervoltage lockout with hysteresis. key specification table typical application device r ds(on) ( ? ) i lim (a) p out @ v in = 92 to 268 vac (w) mc33369p 12 0.5 12 mc33370p 12 0.9 20 mc33371p 6.8 1.5 30 mc33372p 4.8 2.0 35 mc33373ap 4 2.5 40 mc33369t/tv 12 0.5 12 MC33370T/tv 12 0.9 25 mc33371t/tv 6.8 1.5 45 mc33372t/tv 4.8 2.0 60 mc33373t/tv 3.8 2.7 75 mc33374t/tv 3.0 3.3 90
page 4 on/off control methods 1. primary side manual toggle on/off 2. secondary side microcontroller toggle on/off + feedback input v cc power switch + + + + dc output 2 1 5 state control input on/off c state 4 ac input primary side control snubber programmable state controller startup circuit pulse width modular controller power switch circuit ground 3 c state stimuli nominal stan dby* don't care pulsed low 1.8v operating the converter changes from standby* to operating mode nominal operating don't care pulsed low 1.8v standby* the converter changes from operating to standby* mode * standby means no dc output voltage on the output of the power converter input (pin 4) initial state subsequent state converter mode ac line voltage converter mode description snubber secondary voltage regulation voltage feedback voltage feedback feedback input v cc power switch + + + dc output 2 1 5 state control input control outputs toggle request + - c state 4 mc33370 series ac input microcontroller printer port secondary mode control + programmable state controller startup circuit pulse width modular controller power switch circuit ground 3 c state stimuli nominal stan dby* don't care pulsed low 1.8v operating the converter changes from standby* to operating mode nominal operating don't care pulsed low 1.8v standby* the converter changes from operating to standby* mode * standby means no dc output voltage on the output of the power converter input (pin 4) initial state subsequent state converter mode ac line voltage converter mode description
page 5 on/off control methods (continued) 3. primary side toggle request with secondary side microcontroller graceful shutdown snubber secondary voltage regulation primary and on/off control circuits secondary mode control voltage feedback voltage feedback feedback input v cc power switch + + + dc output 2 1 5 state control input toggle confirm control outputs + - c state 4 mc33370 series ac input microcontroller printer port toggle request opto b opto a isolation boundary + programmable state controller startup circuit pulse width modular controller power switch circuit ground 3 c state stimuli nominal st andby* don't care pulsed high 4.4v operating converter mode toggle requested. the set comparator changes the converter mode from standby* to operating mode. nominal operating don't care pulsed high 4.4v operating converter mode toggle requested. no mode change takes place since the converter was initially operating. the toggle request is communicated to the mcu via opto a. nominal operating don't care pulsed low 1.8v standby* upon completion of the housekeeping routine, the mcu confirms the toggle request via opto b. the converter mode changesfrom operating to standby* * standby means no dc output voltage on the output of the power converter initial state subsequent state converter mode input (pin 4) converter mode description ac line voltage 4. programmable on or off state upon application of ac power secondary common primary common toggle confirm control outputs + - c state microcontroller printer port toggle request r v aux opto b opto a isolation boundary mcu graceful shutdown manual toggle operation primary common toggle request to pin 4 to pin 4 10 ? to 10 k r c state or programmable state controller startup circuit pulse width modular controller power switch circuit feedback input v cc ground power switch 2 1 5 state control input 4 3 c state stimuli zero to nominal off c state 0.05f none operating application of the ac line power causes converter operation. the state control input is presently configured to be transparent and has no effect during power-up. zero to nominal off c state 2.0f pulse low 1.8v by c state standby* discharge capacitor cstate causes the toggle comparator to change the control logic state. the converter is placed in the standby* mode with the power switch disabled. * standby means no dc output voltage on the output of the power converter initial state subsequent state ac line voltage converter mode input (pin 4) converter mode description
page 6 questions to ask ? ? are you presently designing an off-line power supply that requires lower system cost? ? ? is efficiency critical to your application? ? ? do you need low component count with a higher system integration level? ? ? do you need a power supply where no additional circuitry is needed for on/off control? ? ? are you looking for a complete power converter system solution that requires smaller circuit board space? ? ? does your design require low power in standby mode? ? ? are you looking for a power supply design that consumes little power while in standby mode? competitive comparison control scheme motorola mc33370 series competitior a competitor b notes max power switch voltage 700 v 700 v 700 v peak switch current (typical) 0.9 to 3.3 a 0.25 to 3.0 a 4 a 1 typical duty cycle range 0.9 to 74% 1.7 to 67% d max =50 to 99% 2 on resistance for series (typical @ t j =25 c) 3 to 12 ? 2.6 to 15.6 ? 2.3 ? control scheme fixed frequency pwm, voltage mode fixed frequency pwm, voltage mode fixed frequency pwm, current mode frequency 100 khz 100 khz adjustable up to 200 khz frequency tolerance (@ t j =25 c) 10% 10% 10% @ 100 khz packaging to-220 5-pin, dip 8* to-220 3-pin, dip-8 to-220 5-pin, power so-10 tab connection to-220 heat sink connected to gnd pin to-220 heat sink connected to gnd pin to-220 heat sink not connected to gnd pin 3 additional features state control pin for converter on/off none synchronization capability 4 blue angel requirement no no yes 5
page 7 notes from table 1. the peak current limit trip point for the mc33370 is set higher than competitor a allowing for more power delivered to the load. 2. warning, all converters with current mode control and operate above 50% duty cycle require slope compensation to avoid sub- harmonic oscillation. competitor b will exhibit a sub-harmonic oscillation when operating above 50% duty cycle (i.e. maximum load and minimum line. to resolve this, competitor b must add a minimal of 4 external components to a circuit that has already more components. both the mc33370 and competitor a are voltage mode and will not have sub-harmonic oscillations. the mc33370 series has a wider duty cycle operating range that allows the converter to deliver power over a wider line of voltage range. 3. in applications requiring a grounded heat sink, competitor b requires an insulated heat sink. with a tab connected to gnd, the amount of radiated noise (emi) is less. 4. the state control block is designed to interface with a small number of external components to implement various methods of converter on/off control. by utilizing the distinctive features of the state control input, this devices series can be programmed to enter into either the standby or operating mode in response to an appropriate input stimulus. the on/off state control pin can be configured to interface with a microcontroller for graceful shutdown operation. graceful shutdown is an advanced form of power management where the microcontroller has the overriding responsibility for determining if and when the converter enters into the standby mode. this is usually programmed to occur after the microcontroller completes a set of housekeeping routines. the on/off state control pin can also be configured to allow the mc33370 series to be a direct replacement to competitor a. during power failures, the on/off state pin can be configured to either remain off when power is applied, or to turn on when power is applied. for details on operation of the on/off state control pin, please refer to the mc33370 datasheet. 5. the blue angel requirement reflects the power consumed by the converter when no load is applied. conclusion a motorola powered converter is capable of higher conversion efficien- cy and higher output power than the other competitive solutions. the motorola device series offers enhanced mosfet drive for faster transi- tions, higher operating temperature and a higher peak current limit that is stable over the temperature range.
page 8 competitive comparison (continued) device r ds(on) ( ? ) i lim (a) p out @ v in = 92 to 276 vac (w) mc33369 12.0 0.5 12 competitor a, #1 21.2 0.3 7 mc33370 12.0 0.9 25 competitor a, #2 15.6 0.5 15 mc33371 6.8 1.5 45 competitor a, #3 7.8 1.0 30 mc33372 4.8 2.0 60 competitor a, #4 5.2 1.5 45 mc33373 3.8 2.7 75 competitor a, #5 3.9 2.0 60 mc33374 3.0 3.3 90 competitor a, #6 3.1 2.5 75 competitor a, #7 2.6 3.0 90 25 20 15 10 5 0 100 80 60 40 20 0 mc33369 competitor a, #1 mc33370 competitor a, #2 mc33371 competitor a, #3 mc33372 competitor a, #4 mc33373 competitor a, #5 mc33374 competitor a, #6 competitor a, #7 r ds(on) , ? and i lim , a p out , w r ds(on) , ? i lim , a p out , w @ v in = 92 to 276 vac
page 9 ordering information to-220 dip-8 to-220 (bent leads) device r ds(on) ( ? ) i lim (a) temperature range package mc33369t 12 0.5 to-220, 5-leads mc33369tv 12 0.5 -40 to +150 c to-220, 5-leads (bent) mc33369p 12 0.5 dip-8 MC33370T 12 0.9 to-220, 5-leads MC33370Tv 12 0.9 -40 to +150 c to-220, 5-leads (bent) mc33370p 12 0.9 dip-8 mc33371t 6.8 1.5 to-220, 5-leads mc33371tv 6.8 1.5 -40 to +150 c to-220, 5-leads (bent) mc33371p 6.8 1.5 dip-8 mc33372t 4.8 2.0 to-220, 5-leads mc33372tv 4.8 2.0 -40 to +150 c to-220, 5-leads (bent) mc33372p 4.8 2.0 dip-8 mc33373t 3.8 2.7 to-220, 5-leads mc33373tv 3.8 2.7 -40 to +150 c to-220, 5-leads (bent) mc33373ap 4.0 2.7 dip-8 mc33374t 3.0 3.3 to-220, 5-leads mc33374tv 3.0 3.3 to -220, 5-leads (bent) -40 to +150 c literature a data sheet containing full specifications is available as mc33370/d . see the last page for detailed information on how to obtain technical lit- erature. lead times & pricing all products are currently available in production quatities. pricing in 10k quantities starts at $0.85. * mc33369 devices are only available in sample quantities. production quantities will be available in 2q99. ** dip-8 packages are only available in sample quantities. production quantities will be available in 1q99.
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