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ISL6151CBZA Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL6151CBZA Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 19 page  11 Applications Information Typical Values for a representative system; which assumes: • 43V to 71V supply range; 48 nominal; UV = 43V; OV = 71V • 1Amp of typical current draw; 2.5 Amp Over-Current • 100 µF of load capacitance (CL); equivalent RL of 48Ω (R = V/I = 48V/1A) R1: 0.02 Ω (1%) R2: 10 Ω (5%) R3: 18k Ω (5%) R4: 549k Ω (1%) R5: 6.49k Ω (1%) R6: 10k Ω (1%) C1: 150nF (25V) C2: 3.3nF (100V) Q1: IRF530 (100V, 17A, 0.11 Ω) Quick Guide to Choosing Component Values (See fig 23 for reference) This section will describe the minimum components needed for a typical application, and will show how to select component values. (Note that “typical” values may only be good for this application; the user may have to select alternate component values to optimize performance for other applications). Each block will then have more detailed explanation of how the device works, and alternatives. R4, R5, R6 - together set the Under-Voltage (UV) and Over- Voltage (OV) trip points. When the power supply ramps up and down, these trip points (and their hysteresis) will determine when the GATE is allowed to turn on and off (UV and OV do not control the PWRGD / PWRGD output). The input power supply is divided down such that when the voltage on the OV pin is below its threshold and the UV pin is above its threshold their comparators will be in the proper state signaling the supply is within its desired range, allowing the GATE to turn on. The equations below define the comparator thresholds for an increasing (in magnitude) supply voltage. The values of R4 = 549K, R5 = 6.49K, and R6 = 10K shown in figure 23 set the Under-Voltage turn-on threshold to 43V, and the Over-Voltage turn off threshold to 71V. The Under- Voltage (UV) comparator has a hysteresis of 135mV (4.6V of hysteresis on the supply) which correlates to a 38.4V turn off voltage. The Over-Voltage comparator has a 25mV hysteresis which translates to a turn on voltage (supply decreasing) of approximately 69.6V. Q1 - is the FET that connects the input supply voltage to the output load, when properly enabled. It needs to be selected based on several criteria: • Maximum voltage expected on the input supply (including transients) as well as transients on the output side. • Maximum current and power dissipation expected during normal operation, usually at a level just below the current limit threshold. • Power dissipation and/or safe-operating-area considerations during current limiting and single retry events. • Other considerations include the GATE voltage threshold which affects the rDS(ON) (which in turn, affects the voltage drop across the FET during normal operation), and the maximum GATE voltage allowed (the ICs GATE output is clamped to ~14V). ISL6141 VDD UV OV VEE SENSE GATE DRAIN PWRGD R4 R5 R6 R1 R2 R3 C2 C1 Q1 CL GND -48V IN -48V OUT RL (LOAD) FIGURE 23. TYPICAL APPLICATION WITH MINIMUM COMPONENTS V UV R 4 R 5 R 6 ++ 〈〉 R 5 R 6 + () ----------------------------------------- 1.255 × = (EQ. 1) V OV R 4 R 5 R 6 ++ 〈〉 R 6 () ----------------------------------------- 1.255 × = (EQ. 2) ISL6141, ISL6151 |
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