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LTC3805-5 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3805-5 Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LT3798 6 3798f CTRL1, CTRL2, CTRL3 (Pin 1, Pin 2, Pin 3): Current Output Adjustment Pins. These pins control the output current. The lowest value out of the three CTRL inputs is compared to negative input of the operational amplifier. VREF (Pin 4): Voltage Reference Output Pin. Typically 2V. This pin drives a resistor divider for the CTRL pin, either for analog dimming or for temperature limit/compensation of output load. Can supply up to 200μA. OVP (Pin 5): Overvoltage Protection. This pin accepts a DC voltage to compare to the sample and hold’s voltage output information. When output voltage information is above the OVP, the part divides the minimum switching frequency by 8, around 500Hz. This protects devices con- nected to the output. This also allows the part to operate with very little power consumption with no load to meet energy star requirements. VC (Pin 6): Compensation Pin for Internal Error Amplifier. Connect a series RC from this pin to ground to compensate the switching regulator. A 100pF capacitor in parallel helps eliminate noise. COMP+, COMP– (Pin 7, Pin 8): Compensation Pins for Internal Error Amplifier. Connect a capacitor between these two pins to compensate the internal feedback loop. FB (Pin 9): Voltage Loop Feedback Pin. FB is used to regulate the output voltage by sampling the third wind- ing. If the converter is used in current mode, the FB pin will normally be at a voltage level lower than 1.25V, and will reach the steady state of 1.25V if it detects an open output condition. DCM (Pin 10): Discontinuous Conduction Mode Detection Pin. Connect a capacitor and resistor in series with this pin to the third winding. VIN (Pin 11): Input Voltage. This pin supplies current to the internal start-up circuitry and to the INTVCC LDO. This pin must be locally bypassed with a capacitor. A 42V shunt regulator is internally connected to this pin. EN/UVLO (Pin 12): Enable/Undervoltage Lockout. A resis- tor divider connected to VIN is tied to this pin to program the minimum input voltage at which the LT3798 will turn on. When below 1.25V, the part will draw 60μA with most of the internal circuitry disabled and a 10μA hysteresis current will be pulled out of the EN/UVLO pin. When above 1.25V, the part will be enabled and begin to switch and the 10μA hysteresis current is turned off. INTVCC (Pin 13): Regulated Supply for Internal Loads and GATE Driver. Supplied from VIN and regulates to 10V (typical). INTVCC must be bypassed with a 4.7μF capacitor placed close to the pin. PIN FUNCTIONS Power Factor vs Input Voltage Efficiency vs Input Voltage VIN (VAC) 90 0.90 0.92 0.91 0.95 0.96 0.97 0.98 0.99 1.00 150 210 190 230 0.93 0.94 130 110 170 250 270 3798 G15 PAGE 17 SCHEMATIC: UNIVERSAL VIN (VAC) 90 60 70 80 90 100 150 210 190 230 130 110 170 250 270 3798 G16 PAGE 17 SCHEMATIC: UNIVERSAL TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C, unless otherwise noted. |
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