may 2012 ? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev. 1.0.3 fan7601b ? green current mode pwm controller fan7601b green current mode pwm controller features ? green current mode pwm control ? low operating current: maximum 4ma ? burst mode operation ? internal high-voltage startup switch ? under-voltage lockout (uvlo): 12v/8v ? latch protection and soft-start function ? over-voltage protection: 19v ? operating frequency up to 300khz ? maximum duty cycle: 95% applications ? offline adapter applications ? auxiliary power supplies related resources ? an4129 ? green current mode pwm controller fan7601 description the fan7601b is a programmable frequency green current mode pwm controller. it is specially designed for the offline adapter applicati ons and the auxiliary power supplies that require high e fficiency at light load and no load. the internal high-volt age startup switch and burst mode reduce the power loss. fan7601b includes protections, such as latch protection and over-voltage protection. the latch protection can be used for over-voltage protecti on, thermal protection, and others. the soft-start pr events the output voltage overshoot at startup. ordering information part number operating junction temperature top mark package packing method fan7601bm -40 c to +150 c 7601b 8-sop rail fan7601bmx 7601b 8-sop tape & reel fan7601bgx 7601b 10-ssop tape & reel
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 2 fan7601b ? green current mode pwm controller block diagram latch/ss delay circuit 1v enable + ? ? gnd (6) startup circuit 2.5v 1.5v startup circuit 5v ref v cc (8) v ref (10) r t /c t (5) latch/ss (4) out (7) cs/fb (3) uvlo 12a v ref 7 19v ovp + ? + ? 12v/8v 6 2 + ? 0.97v/0.9v 1 8 r q s osc 4 3 + ? ovp r q s reset circuit + ? 5 v str (1) 1v figure 1. internal block diagram note: 1. ( ) is 10-ssop pin number.
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 3 fan7601b ? green current mode pwm controller pin configurations figure 2. 8-pin configuration (top view) figure 3. 10-pin configuration (top view) pin definitions pin # (8-pin) pin # (10-pin) name description 1 1 v str startup 2 3 cs/fb current sense and feedback 3 4 latch/ss latch protection and soft-start 4 5 rt/ct oscillator timing 5 6 gnd ground 6 7 out gate drive output 7 8 v cc ic power supply 8 10 v ref voltage reference
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 4 fan7601b ? green current mode pwm controller absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the devic e may not function or be operable above the recommended operating condi tions and stressing the parts to thes e levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v cc supply voltage 20 v v cs/fb input voltage cs/fb -0.3 20.0 v t stg storage temperature -55 +150 c t j recommended operating junc tion temperature -40 +150 c i o output current 250 ma v str v str input voltage 500 v esd electrostatic discharge capability human body model, jesd22-a114 2000 v charged device model, jesd22-c101 1500 thermal impedance symbol parameter value unit ja thermal resistance, junction-to-ambient 8-sop 180 c/w 10-ssop 130
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 5 fan7601b ? green current mode pwm controller electrical characteristics t a =-25 c~125 c, v cc =14v, r t =9.5k , c t =2.2nf unless otherwise specified. symbol parameter conditions min. typ. max. unit reference section v ref reference output voltage i o =1ma 4.85 5.00 5.15 v v ref1 line regulation v cc =10v~18v 10 20 mv v ref2 load regulation i o =1ma ~ 10ma 20 30 mv oscillator section f osc initial accuracy 90 100 110 khz st v voltage stability v cc =10v~18v 1.0 1.5 % v osc amplitude v pin4 peak-to-peak 1.25 v pwm section v cs/fb1 cs/fb threshold voltage1 0.9 1.0 1.1 v d max maximum duty cycle t a =25c 92 95 98 % d min minimum duty cycle 0 % burst mode section v cs/fb2 cs/fb threshold voltage2 (2) 0.77 0.97 1.17 v v cs/fb3 cs/fb threshold voltage3 (2) 0.7 0.9 1.1 v soft-start section i ss soft-start current v pin3 =gnd 9 12 15 a v sl soft-start limit voltage (3) i ss =1 a 1.2 1.5 1.8 v protection section v latch latch voltage 2.25 2.50 2.75 v v ovp over-voltage protection 18 19 20 v uvlo section v th start threshold voltage 11 12 13 v v tl minimum operating voltage 7 8 9 v total current section i op operating supply current 3 4 ma output section v ol low output voltage t a =25 c, i o =100ma 2.0 2.5 v v oh high output voltage t a =25 c, i o =-100ma 11.5 12.0 14.0 v t r rising time (2) t a =25 c, c i =1nf 45 150 ns t f falling time (2) t a =25 c, c i =1nf 35 150 ns startup section i str v str startup current v str =30v, t a =25c 0.5 1.0 1.5 ma notes: 2. these parameters, al though guaranteed, are not 100% tested in production. 3. it is recommended to connect a 1m resistor between the latch/ss pin and gnd to prevent abnormal operation of the latch protection by noise coupling.
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 6 fan7601b ? green current mode pwm controller typical performance characteristics 4.95 4.97 4.99 5.01 5.03 5.05 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() vref (v) 0 0.5 1 1.5 2 2.5 3 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() supply current icc (ma) figure 4. trimmed reference voltage figure 5. supply current 10 10.5 11 11.5 12 12.5 13 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() vcc start threshold vth (v) 7 7.5 8 8.5 9 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() vcc stop threshold vtl (v) figure 6. v cc start threshold voltage figure 7. v cc stop threshold voltage 85 90 95 100 105 110 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() oscillator frequency fos c (khz) 90 92 94 96 98 100 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() maximum duty cycle dmax (%) figure 8. oscillator frequency figure 9. maximum duty cycle 2.3 2.4 2.5 2.6 2.7 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() oscillator high threshold vrh (v) 1.15 1.2 1.25 1.3 1.35 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() oscillator low threshold vrl (v) figure 10. oscillator high threshold voltage figure 11. oscillator low threshold voltage
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 7 fan7601b ? green current mode pwm controller typical performance characteristics (continued) 0 0.4 0.8 1.2 1.6 2 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() start up current istr (ma) 18 18.4 18.8 19.2 19.6 20 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() over voltage protection vov p (v) figure 12. startup current figure 13. over-voltage protection level 2.2 2.3 2.4 2.5 2.6 2.7 2.8 -45 -25 -15 0 25 50 80 100 125 140 junction temperature( ) latch protection vlatc h (v) 9 10 11 12 13 14 -45 -25 -15 0 25 50 80 100 125 140 junction temperature() soft start current iso f (ua) figure 14. latch protection voltage figure 15. soft-start current ct= 1 10 100 1000 5k 15k 25k 35k 45k rt[kohm] frequency[khz ] 10nf 8.2nf 4.7nf 3.3nf 2.2nf 1nf 820pf 680pf figure 16. oscillator fre quency characteristic
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 8 fan7601b ? green current mode pwm controller physical dimensions 8 0 see detail a notes: unless otherwise specified a) this package conforms to jedec ms-012, variation aa, issue c, b) all dimensions are in millimeters. c) dimensions do not include mold flash or burrs. d) landpattern standard: soic127p600x175-8m. e) drawing filename: m08arev13 land pattern recommendation seating plane 0.10 c c gage plane x 45 detail a scale: 2:1 pin one indicator 4 8 1 c m ba 0.25 b 5 a 5.60 0.65 1.75 1.27 6.20 5.80 3.81 4.00 3.80 5.00 4.80 (0.33) 1.27 0.51 0.33 0.25 0.10 1.75 max 0.25 0.19 0.36 0.50 0.25 r0.10 r0.10 0.90 0.406 (1.04) option a - bevel edge option b - no bevel edge figure 17. 8-lead, small outline package (sop) package drawings are provided as a servic e to customers considering fairchild co mponents. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online pack aging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 9 fan7601b ? green current mode pwm controller physical dimensions notes: a) no drawing standard applies to this package b) all dimensions are in millimeters. c) dimensions are exclusive of burrs, mold flash, and tie bar extrusions. d) land pattern recommendation is fsc sourced. e) drawing file name and revision : mkt-msb10a,rev1 land pattern recommendation detail a top view side view end view 5.12 4.72 4.00 4.15 3.75 6.30 5.70 pin one indicator (1.00) #1 5 6 10 1.80 max 0.25 0.10 0.506 0.306 0.30 0.15 r0.20 see detail a seating plane gage plane 8?? r0.15 r0.15 (0.36) 0.70 0.30 (2.04) scale: 2:1 1.75 0.65 5.60 #1 (1.00) (0.26) figure 18. 10-lead, small outline package (ssop) package drawings are provided as a servic e to customers considering fairchild co mponents. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online pack aging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2008 fairchild semiconductor corporation www.fairchildsemi.com fan7601b ? rev.1.0.3 10 fan7601b ? green current mode pwm controller
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