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LT3475 Datasheet(PDF) 6 Page - Linear Technology |
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LT3475 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT3475/LT3475-1 6 3475fb 3475 BD QR QS ∑ INT REG AND UVLO SLAVE OSC SLOPE COMP SLOPE COMP MOSC 1 MOSC 2 FREQUENCY FOLDBACK FREQUENCY FOLDBACK Q R Q S ∑ MASTER OSC SLAVE OSC DRIVER gm1 gm2 BOOST1 BOOST2 D1 D2 D3 D4 DLED1 DLED 2 Q1 Q2 Q3 Q4 C1 C2 CIN COUT1 COUT2 VC2 CC1 VC1 VADJ1 VADJ2 VIN VIN VIN RT SHDN CC2 RT GND EXPOSED PAD REF PWM 1 PWM2 LED1 LED2 SW1 SW2 OUT1 OUT2 0.067Ω 100Ω 0.067Ω 100Ω 1.25k 1.25V 1.25k 2V 2V L1 L2 DRIVER C1 C2 BLOCK DIAGRAM RT (Pin 14): The RT pin is used to set the internal oscillator frequency. Tie a 24.3k resistor from RT to GND for a 600kHz switching frequency. SHDN (Pin 16): The SHDN pin is used to shut down the switching regulator and the internal bias circuits. The 2.6V switching threshold can function as an accurate undervoltage lockout. Pull below 0.3V to shut down the LT3475/LT3475-1. Pull above 2.6V to enable the LT3475/ LT3475-1. Tie to VIN if the SHDN function is unused. REF (Pin 17): The REF pin is the buffered output of the internal reference. Either tie the REF pin to the VADJ pin for a 1.5A output current, or use a resistor divider to generate a lower voltage at the VADJ pin. Leave this pin unconnected if unused. VC1, VC2 (Pins 18, 13): The VC pin is the output of the internal error amp. The voltage on this pin controls the peak switch current. Use this pin to compensate the control loop. VADJ1, VADJ2 (Pins 19, 12): The VADJ pin is the input to the internal voltage-to-current amplifier. Connect the VADJ pin to the REF pin for a 1.5A output current. For lower output currents, program the VADJ pin using the following formula: ILED = 1.5A • VADJ/1.25V. PWM1, PWM2 (Pins 20, 11): The PWM pin controls the connection of the VC pin to the internal circuitry. When the PWM pin is low, the VC pin is disconnected from the internal circuitry and draws minimal current. If the PWM feature is unused, leave this pin unconnected. PI FU CTIO S |
Similar Part No. - LT3475_15 |
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Similar Description - LT3475_15 |
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