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MB3883 数据表(PDF) 19 Page - Fujitsu Component Limited. |
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MB3883 数据表(HTML) 19 Page - Fujitsu Component Limited. |
19 / 40 page MB3883 19 s s s s FUNCTIONS 1. DC-DC Converter Functions (1) Reference voltage block The reference voltage circuit generates a temperature-compensated reference voltage (typically := 2.49 V) from the voltage supplied from the power supply terminal (pin 19). The voltage is used as the reference voltage for the IC’s internal circuitry. The reference voltage can supply a load current of up to 1 mA to an external device through the VREF terminal (pin 16). (2) Triangular-wave oscillator block The triangular wave oscillator incorporates a timing capacitor and a timing resistor connected respectively to the CT terminal (pin 26) and RT terminal (pin 25) to generate triangular oscillation waveform CT (amplitude of 0.3 V to 0.8 V), CT1 (amplitude 1.1 V to 1.8 V in phase with CT), or CT2 (amplitude 1.1 V to 1.8 V in inverse phase with CT). CT1 and CT2 are input to the PWM comparator in the IC. (3) Error amplifier (Error Amp.) block The error amplifier detects the DC/DC converter output voltage and outputs PWM control signals. It supports a wide range of in-phase input voltages from 0 V to “VCC - 1.8 V” (channels 1 to 5), or 0 V to “Vcc-0.9 V”(channel6) allowing easy setting from the external power supply. In addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the output pin to inverted input pin of the error amplifier, enabling stable phase compensation to the system. (4) Inverting amplifier (Inv Amp.) block The inverting amplifier detects the DC/DC converter output voltage (as a negative voltage) and outputs a control signal to the error amp. (5) PWM comparator (PWM Comp.) block The PWM comparator is a voltage-to-pulse width converter for controlling the output duty depending on the input voltage. Channels 1, 2, and 5 main sides,channel 3,4, and 6 : The comparator keeps the output transistor on while the error amplifier output voltage and DTC voltageremain higher than the triangular wave voltage. Channels 1, 2, and 5 synchronous rectification sides : The comparator keeps the output transistor on while the error amplifier output voltage remain lower than the tri- angular wave voltage. (6) Output block The output block on the main side and on the synchronous rectification side is both in the totem pole configuration, capable of driving an external P-channel MOS FET (channels 1, 2 main sides, channel 5 synchronous rectification side), NPN transistor (channel 6), and N-channel MOS FET (channels 3, 4, channel 5 main side, channels 1, 2 synchronous rectification sides). |
类似零件编号 - MB3883_02 |
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类似说明 - MB3883_02 |
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