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ISL1903EVAL2Z Scheda tecnica(PDF) 11 Page - Renesas Technology Corp |
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ISL1903EVAL2Z Scheda tecnica(HTML) 11 Page - Renesas Technology Corp |
11 / 19 page ISL1903 FN8285 Rev 1.00 Page 11 of 19 September 20, 2012 Unbiased Output Voltage Clamp VDD = 6V, ILOAD = 3mA - - 1.9 V Frequency 291 320 349 Hz Maximum Duty Cycle REFIN = 0.5V - - 100 % Minimum On-Time REFIN = 0V - - 0.5 s OVP OVP Threshold 1.46 1.50 1.54 V OVP Hysteresis 10 20 27 A Input Bias Current -1.0 - 1.0 A OVP Clamp Voltage IOVP = 1mA 5.4 - 7.0 V THERMAL PROTECTION Thermal Shutdown (Note 8) 150 160 170 °C Hysteresis (Note 8) - 25 - °C NOTES: 7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 8. Limits established by characterization and are not production tested. Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram - ISL1903” on page 2 and “Typical Application schematics” beginning on page 3. VDD = 17V, RRAMP = 54k, CRAMP = 470pF, TA = -40°C to +125°C, Typical values are at TA = +25°C; Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued) PARAMETER TEST CONDITIONS MIN (Note 7) TYP MAX (Note 7) UNITS Test Waveforms and Circuits FIGURE 2. RISE/FALL TIME TEST CIRCUIT FIGURE 3. RISE/FALL TIMES 9 10 11 12 13 14 15 16 1 2 4 3 5 6 7 8 CS+ DHC OFFREF PWMOUT VREF OUT VDD OC OVP AC IOUT RAMP GND FB DELADJ VERR ISL1903 8V 1nF 2.2nF 470pF 5k 54k 0 TO1V 120Hz OUT OR PWMOUT tR tF 90% 10% |
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