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SP6121 Folha de dados(PDF) 3 Page - Sipex Corporation |
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SP6121 Folha de dados(HTML) 3 Page - Sipex Corporation |
3 / 16 page Date: 5/25/04 SP6121 Low Voltage, Synchronous Step Down PWM Controller © Copyright 2004 Sipex Corporation 3 PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1VCC Positive input supply for the control circuitry and gate drivers. Properly bypass this pin to GND with a low ESL/ESR ceramic capacitor. 2 GND Ground pin. Both power and control circuitry of the IC is referenced to this pin. 3VFB Feedback Voltage Pin. It is the inverting input of the Error Amplifier and serves as the output voltage feedback point for the buck converter. The output voltage is sensed and can be adjusted through an external resistor divider. 4 COMP Output of the Error Amplifier. It is internally connected to the non-inverting input of the PWM comparator. A lead-lag network is typically connected to the COMP pin to compensate the feedback loop in order to optimize the dynamic performance of the voltage mode control loop. Sleep mode can be invoked by pulling the COMP pin below 0.2V with an external open-drain or open-collector transistor. Supply current is reduced to 25µA (typical) in shutdown. An internal 5µA pull-up ensures start-up. 5ISENSE Current Limit Sense pin. Connect this pin to the switching node at the junction between the two external power MOSFET transistors. This pin monitors the voltage dropped across the RDS(ON) of the high side P-channel MOSFET while it is conducting. When this drop exceeds the sum of the voltage programmed through the ISET pin plus the internal 160mV threshold, the overcurrent comparator sets the fault latch and termi- nates the output pulses. The controller stops switching and goes through a hiccup sequence. This prevents excessive power dissipation in the external power MOSFETs during an overload condition. An internal delay circuit prevents that very short and mild overload conditions, that could occur during a load transient, activate the current limit circuit. 6ISET Current Limit Threshold pin. An external resistor connected between this pin and the source of the high side P-channel MOSFET adds to the internal current limit threshold of 160mV. If a current limit threshold in excess of 160mV is required, the external programming resistor can properly be chosen based on the internal 30µA pull down current available on the ISET pin. Both this 30µA current source and the 160mV built-in current limit threshold have a positive temperature coefficient to provide first order correction for the temperature coefficient of the external P-channel MOSFET’s RDS(ON). 7 NDRV High current driver output for the low side MOSFET switch. It is always low if PDRV is low or during a fault. 8 PDRV High current driver output for the high side MOSFET switch. It is always high if NDRV is high or during a fault. ELECTRICAL SPECIFICATIONS: Continued Unless otherwise specified: 0°C < TA < 70°C, 3.0V < VCC < 5.5V, CCOMP = 22nF, CPDRV = CNDRV = 3.3nF, VFB = 1.25V, ISET = ISENSE = VCC, GND=0V PARAMETER MIN TYP MAX UNITS CONDITIONS SOFT START, SHUTDOWN, UVLO: continued Shutdown Threshold Voltage 0.2 0.3 0.4 V Measured at COMP Pin Shutdown Input Pull-up Current 5 µA COMP = 0.2V, Measured at COMP pin V CC Start Threshold 2.69 2.79 2.89 V V CC Stop Threshold 2.59 2.69 2.79 V V CC Hysteresis - 100 - mV GATE DRIVERS PDRV Rise Time - 40 110 ns V CC > 4.5V PDRV Fall Time - 40 110 ns V CC > 4.5V NDRV Rise Time - 40 110 ns V CC > 4.5V PDRV Fall Time - 40 110 ns V CC > 4.5V PDRV to NDRV Non-Overlap Time 80 ns V CC > 4.5V NDRV to PDRV Non-Overlap Time 50 ns V CC > 4.5V |
Nº de peça semelhante - SP6121 |
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Descrição semelhante - SP6121 |
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