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UCC3973PWTR Datasheet(PDF) 3 Page - Texas Instruments |
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UCC3973PWTR Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 24 page  3 UCC1972/3 UCC2972/3 UCC3972/3 ELECTRICAL CHARACTERISTICS:Unless otherwise specified these specifications hold for TA=0°C to +70°C for the UC3972/3, –40°C to +85°C for the UC2972/3, and –55°C to +125°C for the UC1972/3; TA=TJ; VDD=VBAT=VBUCK=12V; MODE=OPEN. For any tests with VBAT>17V, place a 1k resistor from VBAT to VDD. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Oscillator Section Synchronizable Frequency (See Note 2.) BUCK = VBAT– 2, VBAT = 12V to 25V, TA = –40°C to +85°C 80 - 160 kHz BUCK = VBAT–2, VBAT = 12V to 25V TA = –55°C to +125°C 80 - 145 kHz Maximum Duty Cycle FB = 1V, TA < 0°C 84 % FB = 1V, TA = 0°C to 70°C 90 95 % Minimum Duty Cycle FB = 2V 0 % BUCK Input Bias Current BUCK = VBAT = 12V 40 90 mA BUCK = VBAT = 25V 80 110 mA Zero Detect Threshold Measured at BUCK w/respect to VBAT, VBAT=12V to 25V, TA < 0°C –2.4 –1 –0.3 V Measured at BUCK w/respect to VBAT, VBAT=12V to 25V, TA = 0°C to 70°C –2.0 –1 –0.3 V Error Amplifier Input Voltage COMP = 2V, TA =0°Cto+70°C 1.465 1.5 1.535 V COMP = 2V 1.455 1.545 V Line Regulation –2 2 10 mV Input Bias Current –500 –100 nA Open Loop Gain COMP = 0.5V to 3.0V 60 80 dB Output High Voltage FB = 1V 3.3 3.7 4.1 V Output Low Voltage FB = 2V 0.15 0.35 V Output Source Current FB = 1V, COMP = 2V –1.2 –0.4 mA Output Sink Current FB = 2V, COMP = 2V 2 4 mA Output Source Current FB = 1V, COMP = 2V, MODE = 0.5V –1 1 mA Output Sink Current FB = 2V, COMP = 2V, MODE = 0.5V –1 1 mA Unity Gain Bandwidth TJ = 25C, Note 1 2 MHz Mode Select Output Enable Threshold 0.85 1 1.15 V Open Lamp Detect Enable Threshold 2.75 3 3.25 V Mode Output Current MODE = 0.5V 15 20 25 mA MODE Clamp Voltage MODE = OPEN 3.3 3.7 4 V Open Lamp Open Lamp Detect Threshold Measured at BUCK with respect to VBAT, VBAT=12V to 25V –8 –7 –6 V Over-voltage Clamp Threshold (UCC3973) Measured at BUCK with respect to VBAT, VBAT=12V to 25V, IFB = 100µA –10.3 –9 –7.7 V Note 1. Ensured by design. Not 100% tested in production. Note 2. Oscillator operates at 2x transformer switching frequencey. |
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