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ZXGD3101N8 document number ds31945 rev. 1 - 2 1 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller description the zxgd3101 is intended to drive mosfets configured as ideal diode replacements. the device is comp rised of a differential amplifier detector stage and high current driv er. the detector monitors the reverse voltage of the mosfet such that if body diode conduction occurs a positive voltage is applied to the mosfet?s gate pin. once the positive voltage is applied to the gate the mosfet switches on allowing reverse current flow. the detectors? output voltage is then proportional to the mosfet drain-source reverse voltage drop and this is applied to t he gate via the driver. this action provides a rapid turn off as current decays. application ? flyback converters in: ? adaptors ? lcd monitors ? server psu?s ? set top boxes ? llc converter in: ? high power adaptors ? lcd tv ? street lighting refer to documents: an54, an69, dn90, dn91 and dn94 available from the website features ? turn-off propagation delay 15ns and turn-off time 20ns. ? suitable for discontinuous mode (dcm), critical conduction mode (crcm) and continuous mode (ccm) operation ? compliant with energy star v2.0 and european code of conduct v3 ? halogen free part ? 5-15v vcc range mechanical data ? case: so-8 ? marking information: see page 13 ordering information product status package marking reel size (inches) tape width (mm) quantity per reel ZXGD3101N8tc active so-8 zxgd3101 13 12 2500 www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 2 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller maximum ratings parameter symbol limit unit supply voltage (note 1) v cc 15 v continuous drain pin voltage (note 1) v d -3 to180 v gateh and gatel output voltage (note 1) v g -3 to v cc + 3 v driver peak source current i source 4 a driver peak sink current i sink 7 a reference current i ref 25 ma bias voltage v bias v cc v bias current i bias 100 ma power dissipation at t a =25 c p d 490 mw operating junction temperature t j -40 to +150 c storage temperature t stg -50 to +150 c thermal characteristics parameter symbol value unit junction to ambient (note 2) r ja 255 c/w junction to lead (note 3) r la 120 c/w esd rating model rating unit human body 4000 v machine 400 v notes: 1.all voltages are relative to gnd pin 2. mounted on minimum 1oz weight copper on fr4 pcb in still air conditions. 3. output drivers - junction to solder point at end of the lead 5 and 6 www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 3 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller electrical characteristics @t a = 25c, v cc = 10v, r bias =1.8k ? , r ref =3k ? parameter symbol conditions min. typ. max. unit input and supply characteristics operating current i op v drain -200m v - 3 - ma v drain 0v - 8 - gate driver turn-off threshold voltage(note 4) v t v g = 1v, (note 5) -45 -16 0 mv gate output voltage (note 4) v g(off) v drain 0v, (note 5) - 0.6 1 v v g v drain = -60mv, (note 6) 5.0 7.5 - v drain = -80mv, (note 6) 7.0 8.5 - v drain = -100mv, (note 6) 8.4 9 - v drain -140mv, (note 6) 9.2 9.4 - v drain -200mv, (note 6) 9.3 9.5 - gateh peak source current i source v gh = 1v 2.5 - a gatel peak sink current i sink v gl = 5v 2.5 - a turn on propagation delay t d1 c l = 2.2nf, (notes 6 and 7) 525 ns turn off propagation delay t d2 15 ns gate rise time t r 305 ns gate fall time t f 20 ns notes: 4. gateh connected to gatel 5. r h = 100k ? , r l = o/c 6. r l = 100k ? , r h = o/c 7. refer to fig 6: test circuit and fig 7: timing diagram on page 12 www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 4 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller schematic symbol and pin out details differential amplifier high volt comparator threshold voltage control driver gate drive amplitude control turn-on/off control + + - - gateh gatel vcc gnd drain ref bias pin no. symbol description and function 1 nc no connection this pin can be connected to gnd 2 ref reference this pin is connected to v cc via resistor, r ref . r ref should be selected to source approximately 3ma into this pin. (note 8) 3 gatel gate turn off this pin sinks current, i sink , from the synchronous mosfet gate. 4 gateh gate turn on this pin sources current, i source , to the synchronous mosfet gate. 5 v cc power supply this is the supply pin. it is reco mmended to decouple this point to ground closely with a ceramic capacitor. 6 gnd ground this is the ground reference point. connect to the synchronous mosfet source terminal. 7 bias bias this pin is connected to v cc via resistor, r bias . r bias should be selected to source 1.6 times i ref into this pin. (note 9) 8 drain drain connection this pin connects directly to the synchronous mosfet drain terminal. notes: 8. ref pin should be assumed to be at gnd +0.7v. 9. bias pin should be assumed to be at gnd +0.3v. www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 5 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller operation normal operation the operation of the device is described step-by-st ep with reference to the timing diagram below. 1. the detector monitors the mosfet drain-source voltage. 2. when, due to transformer action, the mosfet body diode is forced to conduct there is approximately -0.6v on the drain pin. 3. the detector outputs a positive voltage with respect to ground, this voltage is then fed to the mosfet driver stage and curr ent is sourced out of the gateh pin. 4. the current out of the gateh pin is sourced into the synchronous mosfet gate to turn the device on. 5. the gateh output voltage is now proportional to the drain-sour ce voltage drop across the mosfet due to the current flowing t hrough the mosfet. 6. mosfet conduction continues until the drain current reaches zero. 7. at zero current the detector output voltage is zero and the sy nchronous mosfet gate voltage is pulled low by the gatel, turn ing the device off. drain current zero body diode conduction mosfet gate current www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 6 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller 1a) continuous conduction mode (ccm) 1b) critical conduction mode (crcm) 1c) discontinuous conduction mode (dcm) figure 1: typical waveforms www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 7 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller typical characteristics www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 8 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller typical characteristics -400 -200 0 200 400 600 800 1000 -2 0 2 4 6 8 10 -20 0 20 40 60 -2 0 2 4 6 8 10 -50 -25 0 25 50 75 100 125 150 10 100 1000 -50 -25 0 25 50 75 100 125 150 8.0 8.1 8.2 8.3 8.4 8.5 8.6 0246810 0 5 10 15 20 25 30 35 1000 10000 100000 0 2 4 6 8 10 12 14 16 18 20 v d switch on speed voltage (v) time (ns) v g see fig.4 see fig.4 v g v d switch off speed voltage (v) time (ns) v cc =10v r bias =1.8k r ref =3k c load =2.2nf r load =1k ton toff switching vs temperature time (ns) temperature (c) supply current vs temperature f=100khz v cc =10v r bias =1.8k r ref =3k c load =2.2nf r load =100k supply current (ma) temperature (c) f=100khz, r bias =1.8k r ref =3k , r load =100k supply current vs capacitive load supply current (ma) capacitance (nf) vcc=15v vcc=12v vcc=10v vcc= 8v c load =10nf c load =4.7nf c load =2.2nf c load =1nf v cc =10v r bias =1.8k r ref =3k r load =100k supply current vs frequency frequency (hz) supply current (ma) www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 9 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller -0.10 -0.08 -0.06 -0.04 -0.02 0.00 0 2 4 6 8 10 -0.10 -0.08 -0.06 -0.04 -0.02 0.00 0 2 4 6 8 10 transfer characteristic v g gate voltage (v) v d drain voltage (v) i ref = 2ma i ref =2.5ma i ref = 3ma i ref =3.5ma i ref = 4ma v cc = 10v i bias = 5ma r load =1k i bias = 6ma i bias =5.5ma i bias = 5ma i bias =4.5ma i bias = 4ma transfer characteristic v g gate voltage (v) v d drain voltage (v) v cc = 10v i ref = 3ma r load =1k component selection it is advisable to decouple t he zxgd3101 closely to v cc and ground due to the possibility of high peak gate currents with c1 in figure 2. the proper selection of external resistors r ref and r bias is important to the optimum device oper ation. select a value for resistor r ref to give a reference current, i ref , of ~3ma. the value of r bias must then be 0.6 times the value of r ref giving a bias current, i bias , of ~1.6 times i ref . this provides a recommended typical offset voltage of ~20mv. external gate resistors are optional. they can be inserted to c ontrol the rise times which may help with emi issues, power supp ly consumption issues or dissipation within the part. r ref = (v cc -0.7v) / 0.003 r bias = (v cc -0.3v) / 0.005 layout considerations the gate pins should be as close to the mo sfet gate as possible. also the ground retu rn loop should be as short as possible. th e decoupling capacitor should be close to the v cc and ground pin, and should be a x7r type. for more detailed information refer to application note an54.. www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 10 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller figure 2 example connection for low side synchronous rectification figure 3: example connection for high side synchronous rectification www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 11 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller figure 4: example connections for llc converter figure 5: example connections for forward converter www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 12 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller figure 6: test circuit figure 7: timing diagram www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 13 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller package outline and dimensions suggested pad layout marking information date code key year 2009 2010 2011 2012 2013 2014 2015 code w x y z a b c month jan feb mar apr may jun jul aug sep oct nov dec code 1 2 3 4 5 6 7 8 9 o n d so-8 dim min max a - 1.75 a1 0.10 0.20 a2 1.30 1.50 a3 0.15 0.25 b 0.3 0.5 d 4.85 4.95 e 5.90 6.10 e1 3.85 3.95 e 1.27 typ h - 0.35 l 0.62 0.82 0 8 all dimensions in mm dimensions value (in mm) x 0.60 y 1.55 c1 5.4 c2 1.27 gauge plane seating plane detail ?a? detail ?a? e e1 h l d e b a2 a1 a 45 7 ~ 9 a3 0.254 x c1 c2 y zxgd ym 3101 zxgd3101 = product type marking code ym = date code marking y = year (ex. w = 2009) m = month (ex. 9 = september) www.datasheet.co.kr datasheet pdf - http://www..net/
ZXGD3101N8 document number ds31945 rev. 1 - 2 14 of 14 www.diodes.com june 2010 ? diodes incorporated ZXGD3101N8 a product line o f diodes incorporated synchronous rectifier controller important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical com ponents in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support dev ice or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2010, diodes incorporated www.diodes.com www.datasheet.co.kr datasheet pdf - http://www..net/

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