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MB39C006AEVB-06 Datasheet(PDF) 6 Page - Fujitsu Component Limited. |
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MB39C006AEVB-06 Datasheet(HTML) 6 Page - Fujitsu Component Limited. |
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6 / 48 page  MB39C006A 6 DS04-27245-2E ■ FUNCTION OF EACH BLOCK • PFM/PWM Logic control circuit In normal operation, frequency (2.0 MHz/3.2 MHz) which is set by the built-in oscillator (square wave oscillation circuit) controls the built-in P-ch MOS FET and N-ch MOS FET for the synchronous rectification operation. In the light load mode, the intermittent (PFM) operation is executed. This circuit protects against pass-through current caused by synchronous rectification and against reverse current caused in a non-successive operation mode. • IOUT comparator circuit This circuit detects the current (ILX) which flows to the external inductor from the built-in P-ch MOS FET. By comparing VIDET obtained through I-V conversion of peak current IPK of ILX with the Error Amp output, the built- in P-ch MOS FET is turned off via the PFM/PWM Logic Control circuit. • Error Amp phase compensation circuit This circuit compares the output voltage to reference voltages such as VREF. The MB39C006A has a built-in phase compensation circuit that is designed to optimize the operation of the MB39C006A. This needs neither to be considered nor addition of a phase compensation circuit and an external phase compensation device. • VREF circuit A high accuracy reference voltage is generated with BGR (bandgap reference) circuit. The output voltage is 1.20 V (Typ). • POWERGOOD circuit The POWERGOOD circuit monitors the voltage at the OUT pin. The POWERGOOD pin is open drain output. Use the pin with pull-up using the external resistor in the normal operation. When the CTL is at the H level, the POWERGOOD pin becomes the H level. However, if the output voltage drops because of over current and etc, the POWERGOOD pin becomes the L level. Timing chart example : (POWERGOOD pin pulled up to VIN) VIN CTL tDLYPG or less tDLYPG tDLYPG VOUT POWERGOOD VUVLO VOUT ×97 % VUVLO : UVLO threshold voltage tDLYPG : POWERGOOD delay time (pull up to VIN) |
Similar Part No. - MB39C006AEVB-06 |
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Similar Description - MB39C006AEVB-06 |
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