sc2545 Semtech Corporation, sc2545 Datasheet
sc2545
Related parts for sc2545
sc2545 Summary of contents
Page 1
... POWER MANAGEMENT Description The SC2545 is a high performance dual PWM controller designed to convert a wide ranged input voltage down to two independent output rails. The SC2545 support “peel off ” tracking for the two outputs at start up which means the two outputs ramp up together till the one with lower output level reaching the regulation ...
Page 2
... SC2545 ...
Page 3
... SC2545 ...
Page 4
... SC2545 € ƒ ÃS h ÃU Ãà Ç‚ à Ç‚ à ‰h yˆh ‡v‚ Ã7 ‚ h …q $*1' $*1' 9,1 9 526& ...
Page 5
... SC2545 ...
Page 6
... SC2545 ...
Page 7
... Semtech Corp 0.65V + OUT R - Protect UVLO 0.75V Band 10V Band Gap 1 LDO Gap 2 0.75V 0.675V FB1 FB2 7 SC2545 PVCC Protect 1 PHASE1 PVCC Protect 1 VCC 10u A - OCP OUT + FB1 + OVP OUT - 0.89V + - OUT OVP OCP - www.semtech.com BST ...
Page 8
... DRVH/ DRVL signals stop pulsing. The output voltage ramps down at a rate determined by the load condition. The SC2545 can also be shutdown by pulling down directly on the SS pin. The designer needs to consider the slope of the SS pin voltage and choose a suitable pull down resistor to prevent the output from undershooting ...
Page 9
... The ramp down threshold of the signal is 80% of the regulation target. External pull up is required for the PWRGD pin, and the pull up resistor should be chosen such that the pin does not sink more than 2mA when PWRGD is low. 9 SC2545 100nS 100nS OCP Active OCP Active Blanking ...
Page 10
... ã SC2545 UPV out &R /HVO 5HVU output W ³ HVO R HVU ...
Page 11
... The total equivalent ESR is not simply the parallel combination of all the individual ESR’s either. Instead V O they should be calculated using the following formula esr2 11 SC2545 . The RMS current ripple rating should also ...
Page 12
... The input capacitance should be high Co Ro enough to handle the ripple current common pratice that multiple capacitors are placed in parallel to increase the ripple current handling capability. 12 SC2545 and the input capacitor C has an ESR δ ...
Page 13
... & & ã à … à ‡ SC2545 Sq† Sq† Sq† Sq† P…r†v†‡hprÀPu€ 20 A^` 20 A^` 20 A^` ...
Page 14
... Switching loss however increases with the input voltage. The total power loss of MOSFET should be calculated and compared for high-line and low-line cases. The worst case is then used for thermal design. 14 SC2545 is the gate charge needed to bring the gs1 to the threshold voltage and Q ...
Page 15
... Bottom Switch RMS , , ' UPV PD PD RVV ã SC2545 ˜ & 2'8/$725 &R ( 287 HVU = /& ...
Page 16
... I Ã I Ã S@RV@I8`ÃC“ S@RV@I8`ÃC“ & & 2XW ($ 9 ã Ã Ã Ã Ã & WRS ERW SC2545 : : ...
Page 17
... SC2545 ...
Page 18
... & 13 & 13 SC2545 92 . 5 . 3:*5' )% 66 & Q Q 5 N & & 5 . & 13 5 9, & & & & 5 X)9 X)9 X)9 1 5 5 & & & & & 13 & ...
Page 19
... SC2545 ...
Page 20
... CH1: TG1 CH2: BG1 CH3: TG2 CH4: BG2 Shut down by pulling down EN pin CH1:TG CH2:BG CH3:VSS CH4:Vo Transient response(0-5A). Vss Vss Vo1 Vo1 Vo2 Vo2 Over current protection (5A/10mV) 20 SC2545 CH1:Vi CH2:Ven CH3:VSS CH4:Vo voltage. CH3:Vo CH4:Io CH1:TG CH2:BG CH3:TG CH4:BG www.semtech.com ...
Page 21
... Semtech Corp. Vin=16V 190 188 186 184 182 180 178 Freq. vs. Temp. ( Rosc=75kohm, Vin=16V). 10.5 10.3 10.1 9.9 9.7 9 10.13 10.11 10.09 10.07 10.05 10.03 -40 21 SC2545 -40 - 110 Temperature (Degree C) Vin (V) Vcc vs. Vin ( Ta=25 Degree C). - 100 Tj (Degree C) Vcc vs. Temp. www.semtech.com 120 ...
Page 22
... Tj (Degree C) DL min Ton vs. Tj (Vin=16V). 100 -40 - (Degree C) Dead time vs. Tj (Vin=16V, DH falling to DL rising). © 2005 Semtech Corp 100 120 60 80 100 120 22 SC2545 www.semtech.com ...
Page 23
... SEE DETAIL SIDE VIEW -A- AND - DETERMINED AT DATUM PLANE -H- DIM INCHES Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 23 SC2545 DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - - - .047 1. .006 0.05 0. .042 0.80 1 ...
Page 24
... D/2 K DIM Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 24 SC2545 DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .031 .040 0.90 1.00 .035 0.80 .000 .002 0.00 0.02 0.05 .001 - - ( ...