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ST1S41 数据表(PDF) 7 Page - STMicroelectronics |
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ST1S41 数据表(HTML) 7 Page - STMicroelectronics |
7 / 27 page DocID023654 Rev 2 7/27 ST1S41 Functional description 5 Functional description The ST1S41 is based on a “peak current mode”, constant frequency control. The output voltage VOUT is sensed by the feedback pin (FB) compared to an internal reference (0.8 V) providing an error signal that, compared to the output of the current sense amplifier, controls the on and off-time of the power switch. The main internal blocks are shown in the block diagram in Figure 3. They are: • A fully integrated oscillator that provides the internal clock and the ramp for the slope compensation avoiding sub-harmonic instability • The soft-start circuitry to limit inrush current during the startup phase • The transconductance error amplifier with integrated compensation network • The pulse width modulator and the relative logic circuitry necessary to drive the internal power switches • The drivers for embedded P-channel and N-channel power MOSFET switches • The high-side current sensing block • The low-side current sense to implement diode emulation • A voltage monitor circuitry (UVLO) that checks the input and internal voltages • A thermal shutdown block, to prevent thermal run-away. Figure 3. Block diagram OSC E/A DRIVER DRIVER DMD OTP MOSFET CONTROL LOGIC REGULATOR SHUTDOWN I_SENSE COMP COMP OCP REF 0.8V SOFT-START Vsum Vc OCP UVLO Vdrv_p Vdrv_n I2V R SENSE VINA VINSW SW GNDP GNDA EN FB AM15060v1 |
类似零件编号 - ST1S41 |
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类似说明 - ST1S41 |
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