LM5050 High Side OR-ing FET Controller
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1 LM5050 High Side OR-ing FET Controller TI reference design number: PMP20096 Rev A Input: 5V 75V DC DC Test Results Page 1 of 14
2 Table of Contents Contents 1 Circuit Description Schematic Basic Startup Nominal Input Vin=12V, Force-off Mode On Nominal Input Vin=12V, Force-off Mode Off Minimum Input V in =5V, Force-off Mode On Minimum Input V in =5V, Force-off Mode Off Maximum Input V in =36V, Force-off Mode On Maximum Input V in =36V, Force-off Mode Off OR-ing Function Input shorted from 12V, Output Open Input -12V transient from 12V, Output Open Low-I q Function Quiescent Currents Reverse Polarity Protection V in =-12V, Force-off Mode On, Soft Plug V in =-12V, Force-off Mode Off, Soft Plug V in =-5V, Force-off Mode On, Soft Plug V in =-5V, Force-off Mode Off, Soft Plug Vin=-24V, Force-off Mode On, Soft Plug V in =-24V, Force-off Mode Off, Soft Plug V in =-12V, Force-off Mode On, Hot Plug V in =-12V, Force-off Mode Off, Hot Plug V in =-5V, Force-off Mode On, Hot Plug V in =-5V, Force-off Mode Off, Hot Plug V in =-24V, Force-off Mode Off, Hot Plug V in =-24V, Force-off Mode On, Hot Plug Page 2 of 14
3 1 Circuit Description PMP20096 is an OR-ing FET controller targeted for automotive applications. This design uses the LM5050 OR-ing FET controller, and adds reverse polarity protection and a low quiescent current mode. In this implementation, mosfet Q2 was removed from the original PNP20096 and a PNP BJT based circuit was soldered on to achieve the low-quiescent effect. All tests were performed at room temperature on an open bench, unless otherwise specified. 2 Schematic Page 3 of 14
4 3 Basic Startup Nominal Input Vin=12V, Force-off Mode On Nominal Input Vin=12V, Force-off Mode Off Page 4 of 14
5 3.2.1 Minimum Input V in =5V, Force-off Mode On Minimum Input V in =5V, Force-off Mode Off Page 5 of 14
6 3.3.1 Maximum Input V in =36V, Force-off Mode On Maximum Input V in =36V, Force-off Mode Off Page 6 of 14
7 4 OR-ing Function 4.1 Input shorted from 12V, Output Open 4.2 Input -12V transient from 12V, Output Open Page 7 of 14
8 5 Low-I q Function 5.1 Quiescent Currents BJT solution R1= 1M R5=130K: Currents taken at Pin outputs Iin Iout Ivs Nominal Voltage IN=1KΩ, OUT=14V Low-IQ mode OFF 205.6uA -2.86mA -676uA IN=12V, OUT=14V Low-IQ mode OFF uA -1.08mA uA IN=12V, OUT=1KΩ Low-IQ mode OFF uA mA uA Low Voltage IN=1KΩ, OUT=6V Low-IQ mode OFF 111.5uA -1.51mA uA IN=5V, OUT=6V Low-IQ mode OFF uA -241uA -81uA IN=5V, OUT=1KΩ Low-IQ mode OFF uA -2250uA -59.2uA High Voltage IN=1KΩ, OUT=36V Low-IQ mode OFF uA -3.1mA -798uA IN=25V, OUT=36V Low-IQ mode OFF uA mA uA IN=36V, OUT=1KΩ Low-IQ mode OFF -340uA -3.3uA uA Page 8 of 14
9 6 Reverse Polarity Protection V in =-12V, Force-off Mode On, Soft Plug V in =-12V, Force-off Mode Off, Soft Plug Page 9 of 14
10 6.1.3 V in =-5V, Force-off Mode On, Soft Plug V in =-5V, Force-off Mode Off, Soft Plug Page 10 of 14
11 6.1.5 Vin=-24V, Force-off Mode On, Soft Plug V in =-24V, Force-off Mode Off, Soft Plug Page 11 of 14
12 6.2.1 V in =-12V, Force-off Mode On, Hot Plug V in =-12V, Force-off Mode Off, Hot Plug Page 12 of 14
13 6.2.3 V in =-5V, Force-off Mode On, Hot Plug V in =-5V, Force-off Mode Off, Hot Plug Page 13 of 14
14 6.2.5 V in =-24V, Force-off Mode Off, Hot Plug V in =-24V, Force-off Mode On, Hot Plug Page 14 of 14
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