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CS5112YDWF24G 데이터시트(PDF) 8 Page - ON Semiconductor |
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CS5112YDWF24G 데이터시트(HTML) 8 Page - ON Semiconductor |
8 / 13 page CS5112 http://onsemi.com 8 Figure 11. Block Diagram of the 1.4 A Current Mode Control Switching Regulator Portion of the CS5112 in a Boost Configuration Bandgap Reference IBIAS RBIAS 64.9 k W Switcher Error Amplifier R1 R2 R3 VLIN ENABLE Oscillator COSC COMP COMP Logic Current Sense Amplifier Base Drive + − + − Switcher Shutdown 1.25 V Multiplexer VIN VOUT COUT VSW RS GND 1.4 A VFB1 VFB2 SELECT − + Figure 12. Voltage and Current Waveforms for Boost Topology in CS5112 t IPeak t t IPeak ID ISW VSW VSAT VIN VOUT 0 0 0 PROTECTION CIRCUITRY The current out of VLIN is sensed in order to limit excessive power dissipation in the linear output transistor over the output range of 0 V to regulation. Also, the current into VSW is sensed in order to provide the current limit function in the switcher output transistor. If the die temperature is increased above 160 °C, either due to excessive ambient temperature or excessive power dissipation, the drive to the linear output transistor is reduced proportionally with increasing die temperature. Therefore, VLIN will decrease with increasing die temperature above 160 °C. Since the switcher control circuitry is powered through VLIN, the switcher performance, including current limit, will be affected by the decrease in VLIN. |
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