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UCC28521DW Datasheet(PDF) 6 Page - Texas Instruments |
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UCC28521DW Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 34 page  UCC28521, UCC28528 SLUS608D − JANUARY 2005 REVISED NOVEMBER 2005 6 www.ti.com ELECTRICAL CHARACTERISTICS TA = –40°C to 105°C for the UCC2851x, TA = TJ, VCC = 12 V, RT = 156 kΩ, RCT_BUFF = 10 kΩ (unless otherwise noted) zero power PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Zero power comparator threshold Measured on VAOUT, falling edge 0.20 0.33 0.50 V Zero power comparator hysteresis Measured on VAOUT, rising edge 40 90 140 mV PFC gate driver PARAMETER TEST CONDITIONS MIN TYP MAX UNITS GT1 pull-up resistance −100 mA ≤ ∆IOUT ≤ −200 mA 5 12 Ω GT1 pull-down resistance IOUT = 100 mA 2 10 Ω GT1 output rise time CLOAD = 1 nF, RLOAD = 10 Ω 16 25 ns GT1 output fall time CLOAD = 1 nF, RLOAD = 10 Ω 7 15 ns Maximum duty cycle 93% 95% 100% Minimum duty cycle (trailing edge) See Note 1 1% − 7% PWM stage undervoltage lockout (UVLO2) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS PWM turn-on reference UCC28521 6.30 6.75 7.30 PWM turn-off threshold UCC28521 5.3 V Hysteresis UCC28521 1.16 1.45 1.74 V PWM stage soft-start PARAMETER TEST CONDITIONS MIN TYP MAX UNITS SS2 charge current VSENSE = 7.5 V, SS2 = 0 V –7.0 –10.5 –14.0 µA SS2 discharge current UCC28521 VSENSE = 2.5 V, SS2 = 2.5 V, (UVLO2 = Low, ENABLE = High) 6 10 14 mA Input voltage (VERR) UCC28521 IVERR = 2 mA,UVLO2 = Low 300 mV PWM stage duty cycle clamp PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Maximum duty cycle D_MAX = 4.15 V 70% 75% 80% PWM stage pulse-by-pulse current sense PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Current sense comparator offset voltage ISENSE2 = 0 V, measured on VERR 1.35 1.50 1.65 V 1. Ensured by design. Not 100% tested in production. |
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