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ISL6117CBZA Datasheet(PDF) 7 Page - Renesas Technology Corp |
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ISL6117CBZA Datasheet(HTML) 7 Page - Renesas Technology Corp |
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7 / 14 page  ISL6115, ISL6116, ISL6117, ISL6120 FN9100 Rev 8.00 Page 7 of 14 December 3, 2015 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 1.58k, 1W DD1 12V Zener Diode, 50mA Reverse Current VBUS LOAD ISL6116 PWRON NC FIGURE 2. TYPICAL 5A LOAD CONTROL -48V RCL DD1 12V 1.58k 1W 0.01µF 0.047µF 1.47k 0.005 1% 0.001µF 2k 1% RCL VBUS MIN 12 – ICHIP ------------------------------------------- = (EQ. 1) (EQ. 2) PRCL IC VBUS MAX 12 – = (EQ. 3) IDD1 VBUS MAX 12 – RCL -------------------------------------------------- = (EQ. 4) RCL VBUS MIN 12 – IC ------------------------------------------------ = RCL 36 12 – 0.015 ------------------- = RCL 16k TypicalValue 1.58k = = (EQ. 5) PRCL IC VBUS MAX 12 – = PRCL 0.015 72 12 – = PRCL 0.9W TypicalValue 1W = = (EQ. 6) IDD1 VBUS MAX 12 – RCL -------------------------------------------------- = IDD1 72 12 – 1.58k ------------------------ = IDD1 38mA TypicalValue 12Vrating, 50mA reverse current = = |
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