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SIP12401DMP-T1-E3 Datasheet(PDF) 4 Page - Vishay Siliconix |
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SIP12401DMP-T1-E3 Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 7 page www.vishay.com 4 Document Number: 73193 S-71822-Rev. C, 03-Sep-07 Vishay Siliconix SiP12401 FUNCTIONAL BLOCK DIAGRAM DETAILED OPERATION SiP12401 is a 600 kHz boost controller IC, packaged in 6-pin MLP33, for white LED applications. It features fixed frequency voltage mode PWM control with internal frequency compensation. With the low rDS(on) external power MOSFET, this device maintains high efficiency over a wide range of load current. Soft-Start During soft-start, the loop compensation guarantees the slow increase of the output voltage and inrush current, so that no large voltage overshoot and inrush current occur when the soft-start is ended. PWM operation After soft-start, the device is working in PWM operation with a fixed frequency of 600 kHz. APPLICATION INFORMATION White LED Brightness Control The current of white LED can be adjusted by PWM signal on the XSHD pin or by a variable dc voltage to control its brightness, (see Figure 1.) As control voltage VCTRL increases, the voltage drop on R2 increases and the voltage drop on R1 decreases. Thus, the LED current decreases. The selection of R2 and R3 will make the current from VCTRL much smaller than LED current and much larger than the FB pin bias current. Compensation Reference and Soft-Start Oscillator Driver - + PWM + - E/A VIN AGND PGND FB XSHD EXT XSHD AGND SiP12401 PGND VIN EXT FB 1 3 4 6 2 5 22 µH XSHD 10 µF VIN 4.7 µF MBR0520 15 Ω Si2302ADS R3 3.9 k Ω VCTRL R2 1 k Ω I LED 0.3 V 15 Ω 0.3 V CTRL 15 Ω R2 R3 - |
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