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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MP4088GS датащи(PDF) 14 Page - Monolithic Power Systems |
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MP4088GS датащи(HTML) 14 Page - Monolithic Power Systems |
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14 / 20 page  MP4088 – NON MP4088 Rev. 1.0 11/23/2015 MPS Proprietary Information MOS Diode IL I PK I O V O VFB VREF Figure 4: VFB vs. IOUT The inductor’s average curren regulated by monitoring the intern capacitor voltage. The inductor aver can be calculated with Equation (2): REF L _ AVG S V I R = The peak inductor current can be with Equation (3): = CS _ LIMIT PK S V I R Where RS is the sense resistor con CS to GND. Minimum Operating Frequency Li The MP4088 incorporates a minimu frequency (22kHz) to eliminate au When the operating frequency is 22kHz, the internal peak curren decreases the peak current value operating frequency constant at abo Minimum Off-Time Limit The MP4088 implements a minim limit. During normal operation, the m time limit is 9.3μs. In the start-up minimum off-time limit is shortene from 3.5 times to 1.2 times the norm off-time (see Figure 5). Each minim limit lasts for 32 switching cycles. T ensures a soft-start function of the start up the part. ≥ tMIN_OFF ×3.5 Driver 32 Switching Cycles ≥ tMIN_OFF ×2 ≥ tMIN_OFF ×1.2 32 Switching Cycles 32 Switching Cycles Figure 5: tOFF_MIN at Start-U N-ISOLATED, TRIAC DIMMABLE PFC LED DR www.MonolithicPower.com n. Patent Protected. Unauthorized Photocopy and Duplication Pro © 2015 MPS. All Rights Reserved. nt can be nal sampling rage current (2) e calculated (3) nected from mit um operating udible noise. s less than nt regulator to keep the out 22kHz. mum off-time minimum off- period, the ed gradually mal minimum mum off-time This process IC to safely ≥ tMIN_OFF Up Thermal Protection To protect the IC and the s damage, the MP4088 redu decrease the output curre temperature rising speed junction temperature exc output current drops to aro IC temperature rises to junction temperature exc MP4088 shuts down the sw the junction temperature d the power supply resume thermal shutdown, VCC VCCPRO, and then it is recha high-voltage regulator. Over-Voltage Protection (O If VOVF is higher than VOVP turns off, the MP4088 sto restart cycle begins. Whe chip works in hiccup m monitors the OVF voltage VCC discharges and rechar MP4088 resumes operatio removed. Short-Circuit Protection (S When an LED short circuit o off-time is extended. Due operating frequency limit, switching frequency automa a closed loop control. The condition is limited at a MP4088 resumes normal short circuit is released. Leading Edge Blanking (L Internal leading edge employed to prevent a sw terminating prematurely capacitance discharging w turns on. During the blan from CS to the current c blocked. Figure 6 shows blanking time. t LEB VCS VLIMIT Figure 6: Leading Edge RIVER FOR 230VAC 14 ohibited. system from thermal ces the reference to ent. This limits the of the IC when the ceeds 145°C. The ound 20% when the 160°C. Once the ceeds 160°C, the witching cycle. Once drops below 110°C, es operation. During is discharged to arged by the internal OVP) when the MOSFET ops working and a en OVP occurs, the mode. The MP4088 e continuously, and rges repeatedly. The on once the fault is SCP) occurs, the switching e to the minimum the IC reduces the atically and achieves output power at this a safe range. The operation once the LEB) blanking (LEB) is witching pulse from due to parasitic when the MOSFET king time, the path comparator input is s the leading-edge t e Blanking (LEB) |
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