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ISL6522CRZ-T Datasheet(PDF) 4 Page - Intersil Corporation |
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ISL6522CRZ-T Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 14 page 4 FN9030.7 March 4, 2005 Functional Pin Descriptions RT This pin provides oscillator switching frequency adjustment. By placing a resistor (RT) from this pin to GND, the nominal 200kHz switching frequency is increased according to the following equation: Conversely, connecting a pull-up resistor (RT) from this pin to VCC reduces the switching frequency according to the following equation: Upper Gate Sink RUGATE ISL6522C, ILGATE = 0.3A - 5.5 10 Ω ISL6522I, ILGATE = 0.3A - 5.5 7.2 Ω Lower Gate Source ILGATE VCC = 12V, VLGATE = 6V 300 450 - mA Lower Gate Sink RLGATE ISL6522C, ILGATE = 0.3A - 3.5 6.5 Ω ISL6522I, ILGATE = 0.3A - 3.5 4.5 Ω PROTECTION OCSET Current Source IOCSET VOCSET = 4.5VDC 170 200 230 µA Soft-Start Current ISS -10- µA Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Typical Performance Curves FIGURE 1. RT RESISTANCE vs FREQUENCY FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY 10 100 1000 SWITCHING FREQUENCY (kHz) 10 100 1000 RT PULLUP TO +12V RT PULLDOWN TO VSS 100 200 300 400 500 600 700 800 900 1000 80 70 60 50 40 30 20 10 0 SWITCHING FREQUENCY (kHz) CGATE = 1000pF CGATE = 3300pF CGATE = 10pF 8 9 10 11 12 13 14 7 6 5 4 3 2 1 OCSET SS EN COMP FB RT VCC LGATE PGND BOOT UGATE PHASE GND PVCC SOIC and TSSOP QFN 1 3 4 15 SS COMP FB EN 16 14 13 2 12 10 9 11 6 57 8 PVCC LGATE PGND BOOT GND Fs 200kHz 510 6 • RT ------------------ + ≈ (RT to GND) Fs 200kHz 410 7 • RT ------------------ – ≈ (RT to 12V) ISL6522 |
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