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关于升压失败芯片发烫的问题

		            
		

			

									
					    santajlx
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 6, 2025 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTC7871  
    
    		        		    		    	
			
    LTC7871芯片手册明确表示VHIGH=1.2×（1+RD/RC)的公式，我通过理论计算VHIGH应得48V，但第一次实际测试24V输入，VHIGH等于94V，当我把RD减小时，再次测试，发现芯片发烫，输出电压等于输入电压等于24V，请问是什么原因呢谢谢 
    
									
			                
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    Tags: 
                                            
                 hardware
                
                                                    
                 High Input Voltage Buck Regulators
                
                                                    
                 LTC7871
                
                                                    
                 Step-Down (Buck) Regulators