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| ISL8843 |
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6 page 
6 FN9238.0 October 19, 2005 Long Term Stability TA = 125°C, 1000 hours (Note 8) - 5 - mV Current Limit, Sourcing -20 - - mA Current Limit, Sinking 5- - mA CURRENT SENSE Input Bias Current VCS = 1V -1.0 - 1.0 µA CS Offset Voltage VCS = 0V (Note 8) 95 100 105 mV COMP to PWM Comparator Offset Voltage VCS = 0V (Note 8) 0.80 1.15 1.30 V Input Signal, Maximum 0.97 1.00 1.03 V Gain, ACS = ∆VCOMP/∆VCS 0 < VCS < 910mV, VFB = 0V 2.5 3.0 3.5 V/V CS to OUT Delay -35 60 ns ERROR AMPLIFIER Open Loop Voltage Gain (Note 8) 60 90 - dB Unity Gain Bandwidth (Note 8) 1.0 1.5 - MHz Reference Voltage VFB = VCOMP 2.460 2.500 2.535 V FB Input Bias Current VFB = 0V -1.0 -0.2 1.0 µA COMP Sink Current VCOMP = 1.5V, VFB = 2.7V 1.0 - - mA COMP Source Current VCOMP = 1.5V, VFB = 2.3V -0.4 - - mA COMP VOH VFB = 2.3V 4.80 - VREF V COMP VOL VFB = 2.7V 0.4 - 1.0 V PSRR Frequency = 120Hz, VDD = 12V to 18V (Note 8) 60 80 - dB OSCILLATOR Frequency Accuracy Initial, TA = 25°C 485153 kHz Frequency Variation with VDD TA = 25°C, (F30V - F9V)/F30V -0.2 1.0 % Temperature Stability (Note 8) - - 5 % Amplitude, Peak to Peak Static Test - 1.75 - V RTCT Discharge Voltage (Valley Voltage) Static Test - 1.0 - V Discharge Current RTCT = 2.0V 6.2 8.0 8.5 mA OUTPUT Gate VOH VDD - OUT, IOUT = -200mA - 1.0 2.0 V Gate VOL OUT - GND, IOUT = 200mA - 1.0 2.0 V Peak Output Current COUT = 1nF (Note 8) - 1.0 - A Rise Time COUT = 1nF (Note 8) - 20 40 ns Fall Time COUT = 1nF (Note 8) - 20 40 ns GATE VOL UVLO Clamp Voltage VDD = 5V, ILOAD = 1mA - - 1.2 V PWM Maximum Duty Cycle COMP = VREF 93.5 95 - % Minimum Duty Cycle COMP = GND - - 0 % NOTES: 6. Specifications at -55°C and 125°C are guaranteed by 25°C test with margin limits. 7. This is the VDD current consumed when the device is active but not switching. Does not include gate drive current. 8. Guaranteed by design, not 100% tested in production. Electrical Specifications ISL8843M - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application schematic. VDD = 15V, RT = 10kΩ, CT = 3.3nF, TA = -55 to 125°C (Note 6), Typical values are at TA = 25°C (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ISL8843 |
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