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SS9175CS-10TR Datasheet(PDF) 10 Page - Silicon Standard Corp. |
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SS9175CS-10TR Datasheet(HTML) 10 Page - Silicon Standard Corp. |
10 / 12 page www.SiliconStandard.com 10 of 12 SS9175/6 Two independent voltage outputs using SS9175 For independent outputs, this design is implemented using SS9175. The dual-phase MOSFETs can be supplied from different supply voltages (in this case, from 12V for channel 2, and 5V for channel 1). They can be supplied from the same supply voltage, too. As there are two independent output voltages (2.1V and 1.4V in this case), the divided voltages are fed back to their respective IN1 and IN2 pins. The VCC supply voltage can be either 12V or 5V, depending on the convenience of PCB layout, but VCC = 12V is recommended. If VCC > 6.5V, the BSTC output is fixed at 6V. This BSTC voltage is used as the supply voltage for the bootstrap circuit’s diodes input. A 10uF capacitor is recommended for BSTC decoupling. A 1k resistor is connected from CL1+ and CL2+ to the MOSFET’s high-side voltages. This 1k resistor is used to program the OCP level. 12V 5V PWRG CL1+ CL1- DH1 DL1 BST1 PGND COMP1 VCC PWRGD IN1 CL2+ CL2- DH2 DL2 BST2 BSTC COMP2 SS/ENB GND IN2 10uF 1k 7.5uH 7.5uH 50k 450uF 25k 50k 50k 2.1v 1uF 1uF 0.22uF 1k 2.2pF 2.2pF 450uF n APPLICATION INFORMATION (cont.) Rev.2.02 12/29/2003 PRELIMINARY |
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