参数资料
型号: TPS65530RSLRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: 3.3 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PQCC48
封装: 6 X 6 MM, 0.40 MM PITCH, GREEN, PLASTIC, QFN-48
文件页数: 13/31页
文件大小: 931K
代理商: TPS65530RSLRG4
SLVS744C – OCTOBER 2007 – REVISED MAY 2008....................................................................................................................................................... www.ti.com
Figure 9. LED Brightness Control Block Diagram
At first, CH7 operates as pulse frequency modulation (PFM) mode at start-up. After reaching the target output
voltage, CH7 operation is changed from PFM mode to pulse width modulation (PWM) mode automatically. The
output voltage is programmable up to 20 V to use the feedback loop sensed by the external resistances. The
maximum output voltage is calculated by Equation 8. The block diagram is shown in Figure 10.
VOUT7 MAX = 1 + (R2/R1) × 1.25 [V]
(8)
Where:
VOUT7 MAX = Maximum output voltage of CH7 [V]
R1, R2 = Feedback resistance (see Figure 10)
20
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65530
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