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NCP1081 Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP1081 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 17 page NCP1081 http://onsemi.com 9 Table 3. Operating Conditions Symbol Parameter Min. Typ. Max. Units Conditions VDDH REGULATOR VDDH_reg Regulator output voltage (Notes 10 and 11) Ivddh_load + Ivddl_load < 10 mA with 0 < Ivddl_load < 2.25 mA 8.4 9 9.6 V VDDH_Off Regulator turn−off voltage − VDDH_reg + 0.5 V − V For information only VDDH_lim VDDH regulator current limit (Notes 10 and 11) 13 − 26 mA VDDH_Por_R VDDH POR level (rising) 7.3 − 8.3 V VDDH_Por_F VDDH POR level (falling) 6 − 7 V VDDH_ovlo VDDH over−voltage level (rising) 16 − 18.5 V VDDL REGULATOR VDDL_reg Regulator output voltage (Notes 10 and 11) 0 < lvddl_load < 2.25 mA with lvddh_load + Ivddl_load < 10 mA 3.05 3.3 3.55 V VDDL_Por_R VDDL POR level (rising) VDDL – 0.2 − VDDL – 0.02 V VDDL_Por_F VDDL POR level (falling) 2.5 − 2.9 V GATE DRIVER Gate_Tr GATE rise time (10−90%) − − 50 ns Cload = 2 nF, VDDHreg = 9 V Gate_Tf GATE fall time (90−10%) − − 50 ns Cload = 2 nF, VDDHreg = 9 V PWM COMPARATOR VCOMP COMP control voltage range 1.3 − 3 V For information only ERROR AMPLIFIER Vbg_fb Reference voltage 1.15 1.2 1.25 V Voltage with respect to ARTN Av_ol DC open loop gain − 80 − dB For information only GBW Error amplifier GBW 1 − − MHz For information only SOFT−START Vss Soft−start voltage range − 1.15 − V Vss_r Soft−start low threshold (rising edge) 0.35 0.45 0.55 V Iss Soft−start source current 3 5 7 mA CURRENT LIMIT COMPARATOR CSth CS threshold voltage 324 360 396 mV Tblank Blanking time − 100 − nS For information only OSCILLATOR DutyC Maximum duty cycle − 80% − Fixed internally Frange Oscillator frequency range 100 − 500 kHz F_acc Oscillator frequency accuracy ±25 % 10.Power dissipation must be considered. Load on VDDH and VDDL must be limited especially if VDDH is not powered by an auxiliary winding. 11. Ivddl_load = current flowing out of the VDDL pin. Ivddh_load = current flowing out of the VDDH pin + current delivered to the Gate Driver (function of the frequency, VDDH voltage & MOSFET gate capacitance). |
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