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TPS40091 Fiches technique(PDF) 6 Page - Texas Instruments |
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TPS40091 Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 24 page TPS40090 TPS40091 SLUS578A − OCTOBER 2003 − REVISED JUNE 2004 6 www.ti.com TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION BP5 22 O Output of an internal 5V regulator. A 4.7- µF capacitor should be connected from this pin to ground. For 5V applications this pin should be connected to VDD. COMP 9 O Output of the error amplifier. The voltage at this pin determines the duty cycle for the PWM. CS1 1 I CS2 2 I Used to sense the inductor current in the phases. Inductor current can be sensed with an external current sense resistor or by using an external circuit and the inductor’s DC resistance. They are also used for overcurrent CS3 3 I resistor or by using an external circuit and the inductor’s DC resistance. They are also used for overcurrent protection and forced current sharing between the phases. CS4 4 I protection and forced current sharing between the phases. CSCN 5 I Common point of current sense resistors or filter inductors DIFFO 11 O Output of the differential amplifier. The voltage at this pin represents the true output voltage without drops that result from high current in the PCB traces DROOP 7 I Used to program droop function. A resistor between this pin and the REF pin sets the desired droop value. EN/SYNC 24 I A logic high signal on this input enables the controller operation. A pulsing signal to this pin synchronizes the main oscillator to the rising edge of an external clock source. These pulses must be of higher frequency than the free running frequency of the main oscillator set by the resistor from the RT pin. FB 10 I Inverting input of the error amplifier. In closed loop operation, the voltage at this pin is the internal reference level of 700 mV. This pin is also used for the PGOOD and OVP comparators. GND 17 − Ground connection to the device. GNDS 13 I Inverting input of the differential amplifier. This pin should be connected to ground at the point of load. ILIM 6 I Used to set the cycle-by-cycle current limit threshold. If ILIM threshold is reached, the PWM cycle is terminated and the converter delivers limited current to the output. Under these conditions the undervoltage threshold is reached eventually and the controller enters the hiccup mode. The controller stays in hiccup mode for seven consecutive cycles. At the eighth cycle the controller attempts a full start-up sequence. PGOOD 14 O Power good indicator of the output voltage. This open-drain output connects to the supply via an external resistor. PWM1 21 O Phase shifted PWM outputs which control the external drivers. The high output signal commands a PWM cycle. PWM2 20 O Phase shifted PWM outputs which control the external drivers. The high output signal commands a PWM cycle. The low output signal commands controlled conduction of the synchronous rectifiers. These pins are also used PWM3 19 O The low output signal commands controlled conduction of the synchronous rectifiers. These pins are also used to program various operating modes as follows: for three-phase mode, PWM4 is connected to 5 V; for two-phase mode, PWM2 and PWM4 are connected to 5 V. PWM4 18 O to program various operating modes as follows: for three-phase mode, PWM4 is connected to 5 V; for two-phase mode, PWM2 and PWM4 are connected to 5 V. REF 8 O Output of an internal 0.7-V reference voltage. RT 16 I Connecting a resistor from this pin to ground sets the oscillator frequency. VIN 23 I Power input for the chip. De-coupling of this pin is required. VOUT 12 I Non-inverting input of the differential amplifier. This pin should be connected to VOUT at the point of load. |
Numéro de pièce similaire - TPS40091 |
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Description similaire - TPS40091 |
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