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UCC28221PW Datasheet(PDF) 4 Page - Texas Instruments |
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UCC28221PW Datasheet(HTML) 4 Page - Texas Instruments |
4 / 30 page UCC28220, UCC28221 SLUS544C − SEPTEMBER 2003 − REVISED OCTOBER 2007 4 www.ti.com ELECTRICAL CHARACTERISTICS: VDD = 12 V, 0.1-µF capacitor from VDD to GND, 0.1-µF capacitor from REF to GND, FOSC = 1 MHz, TA = −40°C to 105 °C, TA = TJ, (unless otherwise noted). PARAMETER TEST CONDITION MIN TYP MAX UNITS Reference Output voltage 8 V < VDD < 14 V, ILOAD=0 mA to −10 mA 3.15 3.3 3.45 V Output current Outputs not switching; CNTRL = 0 V 10 mA Ouput short circuit current VREF = 0 V −40 −20 −10 mA VREF UVLO 2.55 3 3.25 V Soft-Start SS charge current RCHG=10.2 k Ω, SS = 0 V −70 −100 −130 A SS discharge current RCHG=10.2 k Ω, SS = 2 V 70 100 130 µA SS initial voltage LINEOV=2 V, LINEUV = 0 V 0.5 1 1.5 V SS voltage at 0% dc Point at which output starts switching 0.5 1.2 1.8 V SS voltage ratio 75% 90% 100% SS Max voltage LINEOV = 0 V, LINEUV = 2 V 3 3.5 4 V Oscillator and PWM Output frequency RCHG = 10.2 k Ω, RDISCHG = 10.2 kΩ 450 500 550 kHz Oscillator frequency RCHG = 10.2 k Ω, RDISCHG = 10.2 kΩ 900 1000 1100 kHz Output maximum duty cycle RCHG = 10.2 k Ω, RDISCHG = 10.2 kΩ, measured at OUT1 and OUT2 73% 75% 77% % CHG voltage 2 2.5 3 V DISCHG voltage 2 2.5 3 V Slope Compensation Slope RSLOPE = 75 k Ω, RCH = 66 kΩ, RDISCHG = 44 kΩ, Csx = 0 V to 0.5 V 140 200 260 mV/us Channel matching RSLOPE = 75 k Ω, Csx = 0 V 0% 10% Current Sense CS1, CS2 bias current CS1 = 0, CS2 = 0 −500 0 500 nA Prop delay CSx to OUTx CSx input 0 V to 1.5 V step 40 85 ns CS1, CS2 sink current CSx = 2 V 2.3 4.5 7 mA CNTRL Section Resistor ratio(1) 0.6 Ctrl input current CTRL = 0 V and 3.3 V −100 0 100 nA Ctrl voltage at 0% dc CSx = 0 V, Point at which output starts switching (checks resistor ratio) 0.5 1.2 1.8 V NOTES: (1). Ensured by design. Not 100% tested in production. |
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