dionics, inc. 65 rushmore street westbury, ny 11590 phone: (516) 997 - 7474 fax: (516) 997 - 7479 website: www.dionics - usa.com dig - 11 - 15 - 30 - dd mosfet drivers with dynamic discharge* *us patent 4,931,656 features: ? fast turn off, active gate disch arge ? dielectrically isolated ? logic circuit compatibility ? high open circuit voltage up to 15v ? high operating temperature ? fast response time ? high isolation resistance ? excellent input/output linearity ? self limiting gate voltage applications: ? gate drive for m os devices ? gate drive for scr ? solid - state relays ? interface between logic circuits & external loads ? a.t.e. (automatic test equipment) ? switching equipment ? isolation amplifiers ? load control from microprocessor i/o ports ? thermocouple open detectors descriptio n: the photovoltaic mosfet driver is a state - of - the - art, optically coupled floating power source used primarily to control mosfets when electrical isolation between input and output is required. in addition to the infrared led and photovoltaic diode arr ay, each of the dd (dynamic discharge) products contains circuitry that rapidly discharges the power mosfet gate when the led is deactivated. the unique rapid discharge features of the photovoltaic mosfet drivers make them particularly useful for high side switching of n - channel mosfets in solid - state relays, dc motor control and switching regulator applications. the typical input circuit to the led is a limiting resistor connected in series with the led. when activated, the led emits infrared light toward s the photovoltaic diode array, which then responds by generating an open circuit voltage (v oc ) and disabling the turn off circuitry. the self - limiting photovoltaic output of the diode array is floating and therefore, can be safely applied directly to the gate and source of a mosfet, regardless of the source potential of the mosfet. when the led is deactivated, the active turn off circuit discharges the capacitive input of the mosfet. the active turn off circuitry is designed such that the turn off time of the mosfet is relatively independent of the input capacitance of the mosfet over a range of 300 to 5000 pf. standard packages include low cost plastic mini - dips and hermetic 8 - pin dip ceramic side brazed. pin designation pin number dig - 11 - 15 - 3 0 - dd 1 input + 2 input - 3 n.c 4 n.c 5 n.c 6 output + 7 n.c 8 output - v equivalent circuit: 2 3 6 7 led pv 1 8 t.o cir. v package layout: 0.185 0.250 dig-11 15-30-dd xxxx 0.380 0.025 0.020 0.070 11 /2001
dig - 11 - 15 - 30 - dd mosfet drivers with active dynamic discharge v electrical characteristics (t a =25 0 c unless otherwise specified) model number dig - 11 - 15 - 30 - dd unit parameter & test condition sym bol min. typ. max. open circuit voltage v oc i led = 2ma 12.0 14.5 16.0 v i led = 10ma 14.0 14.8 16.0 v i led = 30 ma; 50% duty cycle 14.5 15.0 16.0 v short circuit current i sc i led = 2ma 1.0 8.0 - m m a i led = 10ma 10.0 20.0 - m m a i led = 30 ma; 50% duty cycle 39.0 60.0 - m m a led forward voltage v r i f = 20ma - 1.3 1.7 v led reverse current i r v r = 5v 0.1 10.0 - m m a off state voltage v off i off = 10ma; i led = 0ma - 0.65 0.75 v isolation voltage v i so 2500 - - vdc temp. coefficients q q v - 60 - mv / 0 c i led = 10ma q q i - 0.5 - %i / 0 c turn - on time i led = 30 ma t on - 100 - m m s c=1500pf; v oc to 50% turn - off time i led = 30 ma t off - 3.0 6.0 m m s c=1500pf; v oc to 50% typical applications power mosfet photovoltaic spst n/o relays with short circuit protection npn 1 100 ohms 10 mohms 5v dc output - led pv output + dig - 11 - 15 - 30 - dd 6 enh. t.o cir. rs 2 8 power mosfet photovoltaic spst n/o ac - dc relays output led pv 2 output enh. 8 1 t.o cir. 6 5v dc dig - 11 - 15 - 30 - dd 100 ohms 10 mohms enh. 11 /2001 v absolute maxim um ratings (t a = 25 0 c) led forward current led forward current led reverse voltage output discharge current operating temperature range operating temperature range storage temperature power dissipation steady state peak 10% duty cycle plastic d.i.p sid e braze d.i.p 100 ma 150 ma 10v 15ma - 4 0 to 85 0 c - 50 to 125 0 c - 50 to 125 0 c 100 mw
|
