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UCC3839 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC3839 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 6 page 3 UCC1839 UCC2839 UCC3839 ELECTRICAL CHARACTERISTICS: Unless otherwise specified, 0°C to 70°C for the UCC3839, –40°C to 85° for the UCC2839 and –55°C to 125°C for the UCC1839. VLINE = 10V, RG = 400Ω. TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Precision Reference REF TJ = 25°C 4.95 5 5.05 V IREF = 0mA to 1mA, VLINE = 10V to 20V 4.9 5.1 V VA+/REF 0.298 0.3 0.302 V/V VDD Regulator VDD IDD = 0mA to –15mA, VLINE = 10V to 40V 7 7.5 8 V IVDD VLINE = 10V to 40V, CA– = 0V, CA+ = 1V, VA– = 2.9V, CS+ = CS– = 0, IREF = 0 1.3 2 mA Note 1: Guaranteed by design. Not 100% tested in production. CA–: Current Error Amplifier Negative Input. CAO: Current Error Amplifier Output. Output source cur- rent is limited, and output sink current is guaranteed to be greater than the VAO output source current. Current loop compensation components are generally connected to CAO and CA–. CA+: Current Error Amplifier Positive Input. CS–: Current Sense Amplifier Negative Input. CSO: Current Sense Amplifier Output. Internally set gain VOUT/VIN = 8 VIN = 0V results in CSO = 1V. CS+: Current Sense Amplifier Positive Input. GM: Gm (transconductance) Programming Pin. Resistor RGM = 400 Ω to GND. GND: Chip Ground. LED: Output of LED Driver. Connect LED from VDD pin to LED. REF: 5V Precision Reference Buffer Output. Minimum Decoupling Capacitance = 0.01 µF VA–: Voltage Error Amplifier Negative Input. Voltage Er- ror Amplifier is internally referenced to 1.5V VAO: Voltage Error Amplifier Output. In a two loop aver- age current mode control configuration, VAO is con- nected to CA+ and is the current command signal. VAO is internally clamped not to exceed 5V for short circuit control. In a single loop voltage mode control configura- tion with a parallel average short circuit current control loop, VAO is connected directly to CAO. Output source current is limited, and output sink current is guaranteed to be greater than the CAO output source current. VDD: 7.5V Regulator output. Supply for most of the chip. Minimum Decoupling Capacitance = 0.01 µF VGATE: External FET Gate Control Voltage. PIN DESCRIPTIONS Fig. 1 shows a typical secondary side average current mode controller configuration using the UCC3839. In this configuration, output voltage is sensed and regulated by the voltage error amplifier. Its output, VAO provides the reference for the current error amplifier at the CA+ pin. VAO can be connected to CA+ directly or through a re- sistive divider depending on the particular application re- quirements. Average current mode control needs accurate output cur- rent information which is provided by a low value current sense resistor. The voltage proportional to the con- verter’s output current is sensed and amplified by the precision current sense amplifier of the chip. The onboard current sense amplifier has a gain of 8 and is in- tended for differential sensing of the shunt voltage with a common mode voltage range from 0V up to 5V. The out- put of the current sense amplifier, CSO is 1V for zero in- put which guarantees that the circuit can control currents down to 0A. The CSO signal is fed to the CA– input of the current er- ror amplifier through a resistor. The current error ampli- fier takes the VAO and CSO signals and generates the error signal for the pulse width modulator. APPLICATION INFORMATION |
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