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SC4201 POWER MANAGEMENT Pin Configuration Top View Ordering Information Part Number (1) SC4201IMSTR S C 4201E V B P ackag e MSOP-8 Evaluation Board Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (MSOP-8) Pin Descriptions Pin 1 Pin Name RT Pin Function Oscillator frequency is configured by connecting resistor R from RT to ground. Values for R can be selected to provide desired 3 phase or 4 phase output frequencies. [ FOUT {1.25 /(15pF x Rt )]/ phase} 2 3 VD D SYNC The power input connection for the device. SYNC is a positive edge triggered input with a threshold of 1.5V. SYNC should be grounded when not required or connected to an external synchronization clock with frequency higher than the on board oscillator frequency (with respect to internal clock). Logic level output clock. Phase "A". Logic level output clock. Phase "B". Logic level output clock. Phase "C". Logic level output clock and phase selection pin. Default operation 4 phase/2 phase (90/180). Tie D to VDD to select 3 phase operation through A, B and C 120 out of phase. Reference ground and power ground for all functions. 4 5 6 7 8 A B C D GND Block Diagram 2002 Semtech Corp. 3 www.semtech.com SC4201 POWER MANAGEMENT Application Information Diagram in Figure 1 shows multi-phase operation of several power converters with fixed switching frequency FSW. VDD +3 to 6V Ph A sync PWM L C Vout1 = Fsw SYNC Ph B sync PWM L C Vout 2 = Fsw RT Ph C sync PWM L C Vout 3 = Fsw GND Ph D PWM sync L C Vout 4 = Fsw SC4201 optional 3 or 2/4 Phases Figure 1 2002 Semtech Corp. 4 www.semtech.com SC4201 POWER MANAGEMENT Application Information (Cont.) Diagram in Figure 2 demonstrates a multi-phase operation of a single power supply with current sharing through the individual phases and with fixed switching frequency FSW. VDD +3 to 6V Ph A sync PWM L = Fsw SYNC Ph B sync PWM L = Fsw Vout C RT Ph C sync PWM L = Fsw GND Ph D PWM sync L = Fsw SC4201 optional 3 or 2/4 Phases Figure 2 2002 Semtech Corp. 5 www.semtech.com SC4201 POWER MANAGEMENT Application Information (Cont.) Diagram in Figure 3 assumes variable switching frequency FSW, e.g. resonant power converters. This circuit will require additional "FSW Control" block, which is a task for a power designer. VDD +3 to 6V Ph A sync PWM L ~ Fsw SYNC Ph B sync PWM L ~ Fsw Vout C Fsw control RT Ph C sync PWM L ~ Fsw GND Ph D sync PWM L ~ Fsw SC4201 optional 3 or 2/4 Phases Figure 3 2002 Semtech Corp. 6 www.semtech.com SC4201 POWER MANAGEMENT Application Information (Cont.) Diagram in Figure 4 demonstrates a synchronous operation of two (or more) SC4201 controllers. If the "time delay" circuit is to be employed then 6-phase, 8-phase and other configurations become possible. Power Section of choice +3 to 6V VDD Ph A sync PWM L V DD +3 to 6V Ph A ~ Fsw Time Delay (optional) SYNC Ph B sync PWM L SYNC Ph B ~ Fsw Vout C Fsw control RT Ph C sync PWM L RT Ph C ~ Fsw GND Ph D sync PWM L GND Ph D ~ Fsw SC4201 - A optional 3 or 2/4 Phases SC4201 - B Figure 4 2002 Semtech Corp. 7 www.semtech.com SC4201 POWER MANAGEMENT Evaluation Board Schematic +3 to 6V R3 1k 3 Phase - 4 Phase U1 SC4201 1 Run - Sync 2 VDD D 7 D Out RT GND 8 Sync J1 3 SYNC C 6 C Out 4 A B 5 B Out R1 15k C1 1.0 C2 0.1 R2 100K C3 22pF C4 22pF C5 22pF C6 22pF A Out Top View Layout 2002 Semtech Corp. 8 www.semtech.com SC4201 POWER MANAGEMENT Outline Drawing - MSOP-8 Land Pattern - MSOP-8 Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2002 Semtech Corp. 9 www.semtech.com |
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