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ISL6115CB Fiches technique(PDF) 7 Page - Intersil Corporation |
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ISL6115CB Fiches technique(HTML) 7 Page - Intersil Corporation |
7 / 13 page 7 FN9100.7 April 29, 2010 Biasing the ISL6116 Table 3 gives typical component values for biasing the ISL6116 in a ±48V application. The formulas and calculations deriving these values are also shown in the following equations. When using the ISL6116 to control -48V, a Zener diode may be used to provide the +12V bias to the chip. If a Zener is used then a current limit resistor should also be used. Several items must be taken into account when choosing values for the current limit resistor (RCL) and Zener Diode (DD1): •The variation of the VBUS (in this case, -48V nominal) • The chip supply current needs for all functional conditions • The power rating of RCL. • The current rating of DD1 Formulas Sizing RCL is expressed in Equation 1: Power Rating of RCL is expressed in Equation 2: DD1 current rating is expressed in Equation 3: Example: A typical -48V supply may vary from -36 to -72V. Therefore: VBUS,MAX = -72V VBUS,MIN = -36V ICHIP = 15mA (Max) Sizing RCL is expressed in Equation 4: Power rating of RCL is expressed in Equation 5: DD1 current rating is expressed in Equation 6: TABLE 3. TYPICAL VALUES FOR A -48V HOT SWAP APPLICATION SYMBOL PARAMETER RCL 1.58kΩ, 1W DD1 12V Zener Diode, 50mA Reverse Current VBUS LOAD ISL6116 PWRON NC FIGURE 2. TYPICAL 5A LOAD CONTROL -48V RCL DD1 12V 1.58kΩ 1W 0.01µF 0.047µF 1.47kΩ 0.005 1% 0.001µF 2kΩ 1% R CL V BUS MIN () 12 – I CHIP ------------------------------------------- = (EQ. 1) (EQ. 2) P RCL I C VBUS MAX () 12 – () = (EQ. 3) I DD1 V BUS MAX () 12 – () R CL -------------------------------------------------- = (EQ. 4) R CL V BUS MIN () 12 – () I C ------------------------------------------------ = R CL 36 12 – 0.015 ------------------- = R CL 16k Ω TypicalValue 1.58k Ω = [] = (EQ. 5) P RCL I C VBUS MAX () 12 – () = P RCL 0.015 () 72 12 – () = P RCL 0.9W TypicalValue 1W = [] = (EQ. 6) I DD1 V BUS MAX () 12 – () R CL -------------------------------------------------- = I DD1 72 12 – () 1.58k Ω ------------------------ = I DD1 38mA TypicalValue 12Vrating, 50mA reverse current = [] = ISL6115, ISL6116, ISL6117, ISL6120 |
Numéro de pièce similaire - ISL6115CB |
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Description similaire - ISL6115CB |
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