ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 1 of 8 r power management ics general description features the ryc91xx is a digital pwm controller designed for small power, universal line voltage applications. the ryc91xx series of pwm controllers allows the designer to implement source switched architecture to control the hv mosfet or emitter switched architecture to control a bjt. using this technique, the pin count, as well as the number of external components are minimized. the ryc91xx utilizes three-terminal operation by combining the feedback pin with the bias supply pin. current sensing is incorporated within the device and is made possible through the unique source/emitter switching architecture. the ryc91xx contains a startup current source, pwm generator, junction temperature monitor, current sensing and its comparator, and a high current open- drain output stage capable of carrying the entire primary side peak and rms current for up to 5w applications. ? unique emitter drive capability to switch bjt?s ? low operating current allows for low power consumption, green supply designs ? 3 terminal design in a to-92 package ? auto shut down and restart ? cycle-by-cycle current limit ? pulse skip mode operation ? ot protection ? uv protection ? optional frequency dither to reduce electromagnetic interference (emi) applications ? cell phone battery chargers ? pda power supplies ? digital cameras ? set-top cable converter boxes ? digital video keep-alive supplies ? low quiescent current (green) power supplies for appliances and white goods ? universal off-line power supplies (up to 5w) typical application schematics implemented with a bjt implemented with a mosfet r1 zr1 c1 to hvdc r2 t1 sw fb/bias gnd ryc91xx q1 r1 zr1 c1 to hvdc q1 r2 d2 t1 sw fb/bias gnd ryc91xx
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 2 of 8 r power management ics ordering information part description voltage mode vs. current mode frequency (khz) current limit (ma, typ) package type ryc9114-1t current 65 400 to-92 RYC9114-2T voltage 65 400 to-92 ryc9124-1t current 130 400 to-92 ryc9124-2t voltage 130 400 to-92 note: other options are ava ilable, please contact factory. pin configuration device marking pin description pin number pin name pin function 1 fb/bias input for both ic feedback and bias supply, acceptable range: 3.6 to 5.8v 2 gnd control ground and supply return 3 sw switch output block diagram - + pwm control circuit oscillator volt age ref erence star tup vol tag e detector with hyster esi s thermal pr otecti on - + vr ef sw fb/bia s gnd gate driver raychem logo part id1 91xx - xt part id2 lot id
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 3 of 8 r power management ics absolute maximum ratings (notes 1,2) parameter symbol value units max switch voltage v sw -0.3 to +25 v max bias supply voltage v fb/bias -0.3 to +6.7 v storage temperature t s ? 65 to +165 c operating junction temperature t j -20 to 125 c max power dissipation p d 0.6 w junction to ambient thermal resistance r , j-a 200 c/w note 1. operation beyond absolute maximum rating or improper use may result in permanent damage to the device. exposure to absolute maximum rating conditions for ex tended periods or to conditions beyond absolute maximum rating condi tions may adversely affect device reliability. functional operation under absolute maximum rating conditions is not implied. note 2. devices are esd sensitive. handling precautions recommended. electrical characteristics (t a = 25c unless noted) parameters conditions min typ max units fb/bias clamp voltage i in = 5ma 5.9 6.3 6.7 v fb/bias start threshold 5.4 5.8 6.2 v fb/bias uv threshold after turn on 3.4 3.6 4.0 v supply current no switching 0.2 0.4 1 ma full load switching, f sw = 130khz 0.5 0.9 1.5 ma off state leakage current v sw = 10v 0.2 2.2 30 a switch to bias resistor during startup, note 3 2.5 k ? rise time 1000 pf capacitor load with 15 ? pull up resistor 15 30 70 ns fall time 1000 pf capacitor load with 15 ? pull up resistor 10 20 50 ns output drive fet on resistance 25 o c 1.9 ? 125 o c, note 3 2.9 ? thermal shutdown temperature note 3 145 o c thermal shutdown hysteresis note 3 14 o c output current limit di/dt = 100 ma/ s 400 ma output current limit delay di/dt = 165 ma/ s 150 ns output current limit bl anking time 150 250 380 ns output frequency ryc9114 65 khz ryc9124 125 khz output frequency dither 0 khz minimum duty cycle 3.9 6 % maximum duty cycle 65 74 80 % pwm gain 0.06 0.09 0.15 %/ mv input dynamic impedance 4.3 5.7 7.2 k ? note 3. validated by design, not production tested.
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 4 of 8 r power management ics typical characteristics 0 0 0 0 v fb/bias v out v sw v in v uv v start min duty max duty t pulse skip figure 1. power-up waveforms i out 0 a blanking time i limit i pk current limit delay figure 2. graphical explanation of current limit terminology 10% 0 v 90% v sw t fall 90% t rise figure 3. rise and fall time
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 5 of 8 r power management ics v uv pulse skip v start max d.c. min d.c. v fb/bias clamp fb/bias voltage supply current dynamic impedance slope figure 4. supply current vs. fb/bias voltage 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -60 -40 -20 0 20 40 60 80 100 120 140 junction temperature (c) resistance (ohm) (normalized to 25 o c) figure 5. r on vs. temperature 0 0.2 0.4 0.6 0.8 1 1.2 -60 -40 -20 0 20 40 60 80 100 120 140 junction temperature (c) frequency (normalized to 25 o c) figure 6. frequency vs. temperature 0 0.2 0.4 0.6 0.8 1 1.2 -60 -40 -20 0 20 40 60 80 100 120 140 junction temperature (c) current limit (normalized to 25 o c) figure 7. current limit vs. temperature
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 6 of 8 r power management ics functional description the three-terminal ryc91xx series pwm controller incl udes a switch pin (sw), a f eedback and bias pin (fb/bias) and ground pin (gnd). the sw pin is an open-drain output with a current sensing circui t in its output path. the open-drain mosfet is designed to carry the entire prim ary side peak and rms currents for up to 5w line-voltage fed power supplies. the startup current source is also supplied through the switch terminal. the fb/bias pin accomplishes two functions: 1) voltage feedback function. t he output voltage is normally fed back to this pin through an op-to isolator. and 2) bias supply func tion. the ic?s bias power is received at this pin. these two functions are internally decoupled for independent performance. the initial bias power is supplied through the p-ch mosf et, the resistor and the blocking diode as shown in the functional block diagram. as the fb/bias pin voltage reaches a startup threshold value, the pmos is turned off and the ic starts to drive the hv transisto r in a pwm manner. the initial ic bias voltage is supplied by the energy of the external capacitor on the fb/bias terminal until feedba ck energy is received from the auxiliary winding of the transformer. application information 4w constant voltage constant current cell-phone charger d8 1n5821 c7 470uf 85-265vac d5 uf4007 d7 1n4148 d3 d1 d4 d2 zr1 bzx55c15 c1 4.7u c3 1500p r2 1m r3 1m u2 kt1010b c4 47u u3 sl431sf r11 6.8k r12 4.75k c9 0.1u c8 100uf r7 180 r10 4.7k c2 4.7u u1 ryc9124 t1 c5 47u c6 1000p y1 a c 1 a c 2 dc - dc+ r5 470 r8 1.6 q1 stx13003 d6 1n4148 r6 47 l1 2.2mh sw fb/bias gnd r9 180 r1 10 ohm 2w r4 100k c10 0.1u l2 2.2mh a typical application schematic is show n above, using the ryc91xx with a bj t as the high voltage transistor. the power supply operates over a universal input r ange (85?265 vac) and delivers 6v, 700ma current which is adequate to charge most single-cell lithium-ion batteries.
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 7 of 8 r power management ics the inductors l1 and l2, along with the capacitors c1 and c2, provide both common mode and differential mode attenuations for emi. this filter along with the y1 capacitor c6 and the bjt slew control during switching transitions, ensures the power supply to meet the worldwi de emi standards with a 130 khz switching frequency. the high voltage bjt is driven with an emitter switched manner, hence the turn-off storage time is drastically reduced. resistor r5 limits the base current during turn-on and during forward conduction. zener diode zr1 claims the bjt bias as well as the auxiliary winding output of the transformer to 15v. during startup, a small base and collector current flow into the internal current source of ryc91xx and charge the capacit or c4. as the voltage at the fb/bias pin reaches the start thres hold level (5.8v), the controller wakes up, performing pwm function and the internal current source is disconnected at the same time . the energy stored in c4 supplies the ic bias power until adequate energy has been transferred to t he output and the auxiliary winding. the error amplifier circuit of u3 prov ides a constant voltage output. the cons tant current output is accomplished by the voltage drop across the current sensing resistor r8. as the output current increases this voltage reaches the forward bias voltage of the led of the op-to isolator, the output control is t hus switched to a constant current mode. please refer to the appropriate application not es for more details of the application. package information mechanical dimensions to-92 package notes: 1. dimensions and tolerance per ansi y14.5m-1982. 2. controlling dimensions: millimeters 3. dimensions do not include mold flash. mold flash shall not exceed 0.15mm [0.006] per side. 4. interlead flash shall not exceed 0.25 mm [0.010]. min max min max dimension mm mm inch inch a 4.45 5.08 0.175 0.2 b 4.45 5.08 0.175 0.2 c 3.45 3.68 0.135 0.145 d 12.7 0.5 e 1.26 1.28 0.0498 0.0502 f 1.14 1.40 0.045 0.055 g 0.13 0.51 0.005 0.02
ryc91xx pwm power supply controller www.tycopowercomponents.com document: scd 25391 status: preliminary rev. a april 16, 2003 tyco electronics corporation 308 constitution drive, menlo park, ca 94025 tel: ( 800) 227-4856 fax: (800) 227-4866 8 of 8 r power management ics information furnished is believed to be accurate and reliable. however, users should independently evaluate the suitability of each product for their applications. tyco electronics corporation assumes no responsibility for the use of its product or for any infringement of pate nts or other rights of third parties resulting from the use of its product. no license is granted by implic ation or otherwise under any patent or pro prietary right of tyco electronics except the right to use such pr oduct for the purpose for which it is sold. tyco electronics reserves the right to change or update, without notice, any information contained in this publication; to change, without notice, the des ign, construction, processing, or specification of any product; and to discontinue or limit production or distribution of any product. this publication supersedes and replaces all i nformation previously supplied. without express written consent by an officer of tyco electronics, tyco electronics does not authorize the use of an y its products as components in nuclear facility applications, aer ospace, or in critical life support devices or systems. tyco electronics? only obligations are those in the tyco electronics standard terms and conditions of sale and in no case will tyco electronics be liable for any incidental, i ndirect, or consequential damages arising from the sale, re sale, use, or misuse of its products. r is a trademark of tyco electronics corporation ? 2003 tyco electronics corporation
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