L6615 STMicroelectronics, L6615 Datasheet
L6615
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L6615 Summary of contents
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... L6615 L6615 L6615 L6615 BCD TECHNOLOGY DIP8 SO8 ORDERING NUMBERS: L6615N L6615D L6615DTR(T & Reel) +OUT +OUT +OUT LOAD LOAD LOAD GND GND GND ( * ) OR-ing FET can ( * ) OR-ing FET can be used to reduce be used to reduce power dissipation power dissipation ...
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... The device is able to perform both high side and low side current sensing, that is the sense current resistor can be placed either in series to the power supplies output or on the ground return. The L6615 then drives the share bus to a voltage proportional to the output current of the master that is to the highest amongst the output currents delivered by the paralleled power supplies. ...
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... VCC VCC GND GND 1 7 CGA 7 CGA 2 2 CS- CS CS+ CS ADJ ADJ COMP COMP Parameter L6615 Value Unit selflimit -0 -0.3 to 1.5 V -0.7 to 0.7 V SO8 0.45 W DIP8 0.6 -40 to +125 °C -55 to +150 °C MINIDIP SO8 Unit 90 120 ° ...
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... L6615 ELECTRICAL CHARACTERISTCS (Tj = -40 to 85°C, Vcc=12V, V ADJ SENSE L SENSE G1 G2 Symbol Parameter Vcc V Operating range cc I Quiescent current cc V Turn-on voltage CC Turn-off voltage CC,OFF V Hysteresis H Vz CURRENT SENSE AMPLIFIER V Input offset voltage OS V Out high voltage CGA ...
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... SHARE DRIVE SHARE DRIVE AMPLIFIER (SDA) AMPLIFIER (SDA 1.5V 1. GND GND L6615 Max. Unit -400 A 300 A 0. 140 COMP COMP 5/20 ...
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... L6615 Figure 1. Turn-on and turn-off voltage [V] CC(ON) CC(OFF) 3 2.6 2.2 - Figure 2. Supply current vs. supply voltage I [ mA] CC 100 10 1 0.1 0.01 0 [V] CC Figure 3. Supply current I [mA] CC 4.7 4.3 3.9 3.5 3.1 2 6/20 Figure 4. Max CGA current I CGA(max) 2.8 2.6 2.4 2 100 Figure 5. High side/low side sensing ...
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... Figure 7. Share bus input impedance Figure 8. ADJ maximum current I [mA] AD J[MAX 100 - 50 L6615 0 50 100 7/20 ...
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... On the power lines are placed the sense resistors R (to avoid that the failure of one module shorts the load out) L6615 allows attaining an automatic master-slave current sharing architecture: one L6615 is associated to each power supply and all these IC's are linked each other through the share bus (referred to the common ground). ...
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... CS- ing a drop across the R external resistor: two internal buffers transfer V CGA Only the L6615 V limits the upper voltage at the CGA and SH pin, independently of the voltage present CC at the current sense pins. In noisy applications, two capacitors of small value (e.g. 1nF) connected between current sense pins and ground could be useful to clean the signal at the input of the current sense amplifier ...
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... The first design step is usually the choice of the sense resistor whose maximum value is limited by power dissipation; this constraint must be traded off against the precision of L6615 current sensing. In fact a small sense resistance value lowers the power dissipation but reduces the signal available at the inputs of the L6615 current sense amplifier ...
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... The effect of current sharing feedback loop is to force the voltages of the slave's CGA pins to be equal to V (that is to reduce the voltage difference at the inputs of the L6615 error amplifier). For the sake of SH simplicity we consider 2 paralleled power supplies (as in fig. 11): under closed loop condition: ...
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... H 1 ADJ V REF lower than (or equal to) one tenth of R1, considering that, in ADJ V OUT I = ------------------ ADJ max R ADJ must be done to make the L6615 able to correct the ADJ V OUT R = ------------------------- - ADJ min I ADJ max – + OUT ADJ ADJ ...
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... MOS is placed in series to the output and its channel resistance (R DS(ON) as sense resistor (fig 13a): the L6615 sense pins will be connected, through R and to the source of the MOS. Besides providing the sense resistor, the FET is used as "ORing" el- ement: driving properly its gate possible isolate the power supply output from the load (the body diode is reversed biased so it doesn't conduct). This is useful whenever features like hot swap or hot plug are required ...
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... L6910 [1] or L6911 [2] ST de- vice). The L6615 reads the drop across the Rds(ON) of the OR-ing FET and the LM293 drives its gate, pulling it down whenever a fault condition (e.g. short on the low side) appears. A charge pump could be necessary to be sure that the ORing FET V on the input and output voltage) ...
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... In fig.15 two AC-DC converters supply the same load through a +48V bus; these converters usually exhibit also a +12V auxiliary output useful to supply the L6615 whose ADJ pin works on the +48V feedback sec- tion (COMP pin and CGA pin connections are not showed) in figure 15. ...
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... The current sharing accuracy strongly depends on the unbalance between the relevant parameters of the paralleled sections. Each percentage point on the relevant parameters tolerance introduces a maximum error equal to the double of the tolerance.The L6615 introduces an inherent error in current sharing due to the 40mV offset at the negative input of the error amplifier; this offset is necessary to guarantee the low value of the master COMP pin ...
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... CGA L6615 L6615 R R CGA CGA ---------------------------------------------------------------------------- - V – OUT MIN R OPT and it has to be set at one half of its range OUT OUT CS- CS- and its value will be: OUT(MAX – OPT R R – – K OPT K G L6615 , OUT(MIN) 17/20 ...
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... L6615 mm DIM. MIN. TYP. MAX. A 3.32 a1 0.51 0.020 B 1.15 1.65 0.045 b 0.356 0.55 0.014 b1 0.204 0.304 0.008 D 10.92 E 7.95 9.75 0.313 e 2.54 e3 7.62 e4 7.62 F 6.6 I 5.08 L 3.18 3.81 0.125 Z 1.52 18/20 inch MIN. TYP. MAX. 0.131 0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0.260 0.200 0.150 0.060 OUTLINE AND MECHANICAL DATA Minidip ...
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... D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). inch MIN. TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 0.050 0.150 0.15 0.157 0.050 0.024 OUTLINE AND MECHANICAL DATA SO8 L6615 19/20 ...
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... L6615 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...