1 sr036/sr037 06/13/02 supertex inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." supertex does not assume responsibility for use of devices described and limits its liabi lity to the replacement of devices determined to be defective due to workmanship. no responsibility is assumed for possible omissions or inaccuracies. circuitry and specifications are subject to c hange without notice. for the latest product specifications, refer to the supertex website: http://www.supertex.com. for complete liability information on all supertex products, refer to the most curre nt databook or to the legal/disclaimer page on the supertex website. inductorless, dual output off-line regulators sr036 sr037 general description the supertex sr036 and sr037 are inductorless, dual output off-line controllers. they do not require any transformers, inductors, or high voltage input capacitors. the input voltage, hv in , is designed to operate from an unfiltered full wave rectified 120v or 240v ac line. it is designed to control an external n-channel mosfet. when hv in is between v gs(th) to 40v, where v gs(th) is the threshold voltage of the external mosfet, the external n-channel mosfet is turned on allowing it to charge an external capacitor connected to v source . an unregulated dc voltage will develop on v source . once hv in is above 45v, the n-channel mosfet is turned off. the maximum gate voltage for the external mosfet is 24v. the unregulated voltage is approximately 18v. the sr036 also provides a regulated 3.3v whereas the sr037 provides a regulated 5.0v. w arning!!! galvanic isolation is not provided. dangerous voltages are present when connected to the ac line. it is the responsibility of the designer to assure adequate safeguards are in place to protect the end user from electrical shock. features ? accepts peak input voltages up to 700v ? operates directly off of rectified 120v ac or 240v ac ? integrated linear regulator ? minimal power dissipation ? no high voltage capacitors required ? no transformers or inductors required applications ? 3.3v or 5.0v power supplies ? smps house keeping power supplies ? white goods ? appliances ? small off-line low voltage power supplies ? lighting controls sr03x typical application circuit surge protection sr036 or sr037 100 f 1.0 f sr036: v out =3.3v regulated sr037: v out =5.0v regulated ~ 18v unregulated 120vac or 240vac v out v source gate demo kit a vailable
2 sr036/sr037 absolute maximum ratings* v in , high voltage input +700v v out , low voltage output +6.0v storage temperature -65 c to +150 c soldering temperature +300 c power dissipation, msop-8 300mw power dissipation, so-8 slug 1.50w * all voltages are referenced to gnd. ordering information v h n i m u m i x a m e g a t l o v e g a t l o v e t a g ) x a m ( v t u o s n o i t p o e g a k c a p 8 - p o s mg u l s t a e h / w 8 - o s v 0 0 7v 4 2 v 3 . 3* g m 6 3 0 r sg s 6 3 0 r s v 0 . 5* g m 7 3 0 r sg s 7 3 0 r s . l e e r e p a t r e i r r a c e c e i p 0 0 5 2 n o d e i l p p u s t c u d o r p * pin configuration so-8 slug backside: gnd (top view) 1 2 3 4 8 7 6 5 hv in gate n/c source n/c v out gnd n/c msop-8 (top view) 1 2 3 4 8 7 6 5 hv in gate n/c source n/c v out gnd n/c electrical characteristics (over operating supply voltages unless otherwise specified, t a =0 c to +125 c) l o b m y sr e t e m a r a pn i mp y tx a ms t i n us n o i t i d n o c v h n i e g a t l o v t u p n i 0 0 7 v e g a t l o v t n e i s n a r t k a e p 7 0 4e g a t l o v c a d e i f i t c e r k a e p v h t v h n i d n u o r g o t d e l l u p s i e t a g n e h w e g a t l o v0 45 40 5v v s g e g a t l o v p m a l c e c r u o s o t e t a g0 1 ? 1 ? 2 ?i s g a 0 0 1 = v e t a g e g a t l o v p m a l c d n u o r g o t e t a g8 10 24 2v v t u o e h t r o f e g a t l o v t u p t u o d e t a l u g e r 8 - p o s m 6 3 0 r s7 9 . 20 3 . 33 6 . 3 v v e c r u o s i , v 0 1 = t u o a m 5 1 = 7 3 0 r s0 5 . 40 0 . 50 5 . 5v e c r u o s i , v 0 1 = t u o a m 5 1 = v t u o 8 - o s e h t r o f e g a t l o v t u p t u o d e t a l u g e r g u l s t a e h h t i w 6 3 0 r s7 9 . 20 3 . 33 6 . 3 v v e c r u o s i , v 0 1 = t u o a m 0 3 = 7 3 0 r s5 . 40 0 . 50 5 . 5v e c r u o s i , v 0 1 = t u o a m 0 3 = q e r fy c n e u q e r f c a t u p n i0 40 0 1z h
3 sr036/sr037 t ypical performance curves gate clamp temperature ( c) hv in (off) temperature ( c) hv in (v) hv in (v) vgate (v) hv input current i in ( a) load regulation (sr037) v out (v) i out (ma) regulator output (sr037) v out (v) source voltage (v) gate voltage hv in (v) v gate (v) -40 -10 20 50 80 110 140 0 5 10 15 20 25 -40 -10 20 50 80 110 140 0 10 20 30 40 50 60 0510 15 20 25 0 1 2 3 4 5 6 0102 03040506070 80 0 2 4 6 8 10 12 14 16 18 20 050 100 150 200 250 300 350 400 0 300 600 900 1200 1500 1800 2100 0510 15 20 25 30 35 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 5.05 source=8v 25 c source=15v 25 c -40 c 25 c 125 c
4 sr036/sr037 applications information functional block diagram v ref cm reg hv in gate source gnd v out operating principle the sr03x operates by controlling the conduction angle of the external mosfet as shown in figure 1. when the rectified ac voltage is below the v th threshold, the pass transistor is turned on. the pass transistor is turned off when the rectified ac is above hv in(off) . output voltage (vunreg) decays during the periods when the switch is off and when the rectified ac is below the output voltage. the amount of decay is determined by the load and the value of c1. since the switch only conducts with low voltages across it, power dissipation is minimized. switch on v th hv in v reg v unreg not to scale figure 1: typical waveforms
5 sr036/sr037 applications information, continued 220 f 1 f sr036 or sr037 vn2460n 8 v unreg hv in gnd gate source v out v reg i out typical 40ma ( i unreg + i reg) fuse surge protection 120vac or 240va c figure 2: example circuit with enable control 1k ? tn2106k1 on/off figure 3: generating two regulated voltages 220 f 1 f sr036 vn2460n 8 1 f 1m ? vz 5.6v v out1 =5.0v v out2 =3.3v 10k ? 120vac or 240vac fuse surge protection 2n3904 hv in gnd gate source v out figure 2 is an example circuit using the sr036 or sr037 along with a supertex vn2460n8 mosfet to generate an unregu- lated voltage of approximately 18v and a regulated voltage of 3.3v for the sr036 or 5.0v for the sr037. the combined total output current is typically 40ma. the tn2106k1 in series with a 1k ? resistor can be added for applications requiring an enable control. for applications requiring two regulated voltages, an inexpen- sive discrete linear regulator can be added to regulate the unregulated output as show in figure 3. the discrete linear regulator consists of a zener diode, a resistor and a bipolar transistor. the regulated voltage, vout1, is determined by the zener diode voltage minus the base-to-emitter voltage drop of 0.6v. figure 3 uses a 5.6v zener diode to obtain a 5.0v output. different zener diode voltages can be used to obtain different regulated output voltages.
6 sr036/sr037 applications information, continued 12v coil relay 220 f 1 f sr036 vn2460n 8 120vac or 240vac fuse surge protection logic control circuit unregulated voltage 3.3v vn2110k1 1n4001 hv in gnd gate source v out figure 4: driving 12v relay coils the circuit shown in figure 4 uses the sr036 to supply a regulated 3.3v for the logic control circuitry while the unregu- lated voltage is used to drive a 12v relay coil. the operating voltage for a 12v relay coil is typically very wide and can therefore operate directly from the unregulated line. 220 f 1 f sr037 vn2460n8 120vac or 240vac fuse surge protection logic control circuit unregulated voltage 5.0v 100 ? 1k ? 2n3904 1n4001 5v coil relay hv in gnd gate source v out figure 5: driving 5v relay coils the circuit shown in figure 5 uses the sr037 to supply a regulated 5.0v for the logic control circuitry while the unregu- lated voltage is used to drive a 5.0v coil relay. to overcome the voltage variation of the unregulated line, a bipolar transistor is used to drive the coil with a constant current. the resistor value from the emitter to ground sets the desired coil current. for an arbitrary coil current of 40ma, the resistor value can be calcu- lated as: r = 5.0v - 40ma 1k - v 40ma where v = 0.6v and = 100 = 100 be be ? ? ,
7 sr036/sr037 applications information, continued 1235 bordeaux drive, sunnyvale, ca 94089 tel: (408) 744-0100 ?fax: (408) 222-4895 www.supertex.com 06/13/02rev.12 ?002 supertex inc. all rights reserved. unauthorized use or reproduction prohibited. 220 f 1 f sr037 vn2460n8 120vac or 240vac fuse surge protection logic control circuit unregulated voltage 5.0v 5v coil relay vz 5.1v hv in gnd gate source v out figure 6: driving 5v relay coils with zener diode clamp the circuit shown in figure 6 uses the sr037 to supply a regulated 5.0v for the logic control circuitry. a 5.1v zener diode is used in parallel with the 5.0v relay coil to ensure that the relay coil s maximum operating voltage is not exceeded. the zener diode also acts as the catch diode when the coil is switched to the off state. an external series resistor is used to limit the amount of zener current. 220 f 1 f sr036 or sr037 tn2425n8 120vac fuse surge protection 330 ? 330 ? unregulated voltage hv in gnd gate source v out figure 7: driving leds from 120vac v reg the circuit shown in figure 7 uses the sr036 or sr037 to drive 12 high efficient red leds from a 120v ac line. the average led current is approximately 20ma.
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