sc2608a Semtech Corporation, sc2608a Datasheet
sc2608a
Available stocks
Related parts for sc2608a
sc2608a Summary of contents
Page 1
... Current limit is implemented by sensing the voltage drop across the bottom MOSFET R The SC2608A operates at a fixed frequency of 250kHz providing an optimum compromise between efficiency , external component size, and cost. SC2608A has a thermal protection circuit, which is ...
Page 2
© ...
Page 3
© ...
Page 4
... POWER MANAGEMENT Gate Drive Timing Diagram Block Diagram REF 0.8V E/A + SENSE - 2006 Semtech Corp. © Figure 2 OSC PWM VCC OCP & UVLO OCP PHASE COMP/SS Figure 3 4 SC2608A BST VCC LEVEL DH SHIFT PHASE NON-OVERLAP TIMING 0 Vcc DL GND 0 0 www.semtech.com ...
Page 5
... SC2608A ...
Page 6
... OCP Hiccup OCP Hiccup OCP Hiccup OCP Hiccup In the event that an overcurrent is detected, the SC2608A latches the fault and begins a hiccup cycle. Switching is immediately stopped, and the drivers are set to a tristate condition (Both DH and DL are low). COMP is slowly discharged to 300mV with an internal 6uA current source, providing a long cooldown time to keep power dissipation low in the event of a continuous dead short ...
Page 7
... SENSE is high(above 300mV) while COMP is low, then the SC2608A turns on the low side FET to discharge the output before changing to shutdown or soft-start mode. The low side FET turns off when SENSE drops below 300mV and the converter remains in the tri-state condition until COMP is released ...
Page 8
... R F zero SC2608A soft start time is determined by the compensation capacitor. Capacitance can be adjusted to satisfy the soft start requirement. (6) The final step is to generate the Bode plot by using the simulation model in Fig using the equations pro- vided here with Mathcad. The phase margin can then be checked using the Bode plot ...
Page 9
... SC2608A ture - mpe ra ture ( ture - ...
Page 10
... SC2608A +12V/+5V/+3. 2.5VOUT/15A C10 C11 ...
Page 11
... DH DH Phase node Phase node sustain loading 2006 Semtech Corp. © Vin Vin Comp/ SS Comp Over Current Protection (21A DC tripped) 11 SC2608A Start Vin Vin Comp/ SS Comp OCP HICCUP Vin Vin Comp/ SS Comp ...
Page 12
... SC2608A 5VDual 1.8VOUT/24A C8 C9 C10 C11 C12 C13 R3 1.27k ...
Page 13
... SC2608A 20VIN 5VOUT/8A 2.2uH 2R2 ...
Page 14
... SC2608A ...
Page 15
... REFERENCE IPC-SM-782A, RLP NO. 300A. Contact Information 2006 Semtech Corp. © DIM INCHES Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 15 SC2608A DIMENSIONS MILLIMETERS (.205) (5.20) .118 3.00 .050 1.27 .024 0.60 .087 2.20 .291 7.40 www.semtech.com ...