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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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CS5156GN16 Datenblatt(PDF) 10 Page - Cherry Semiconductor Corporation |
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CS5156GN16 Datenblatt(HTML) 10 Page - Cherry Semiconductor Corporation |
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10 / 14 page  Applications Information: continued 10 External Output Enable Circuit On/off control of the regulator can be implemented through two additional discrete components (see Figure 12). This circuit operates by pulling the soft start pin high, and the VFFB pin low, emulating a short circuit condition. Figure 12: Implementing shutdown with the CS5156. External Power Good Circuit An optional Power Good signal can be generated through the use of four additional external components (see Figure 15). The threshold voltage of the Power Good signal can be adjusted per the following equation: VPower Good = This circuit provides an open collector output that drives the Power Good output to ground for regulator voltages less than VPower Good. Figure 13: Implementing Power Good with the CS5156. Figure 14: CS5156 demonstration board during power up. Power Good signal is activated when output voltage reaches 1.70V. Selecting External Components The CS5156 can be used with a wide range of external power components to optimize the cost and performance of a particular design. The following information can be used as general guidelines to assist in their selection. NFET Power Transistors Both logic level and standard MOSFETs can be used. The reference designs derive gate drive from the 12V supply which is generally available in most computer systems and use logic level MOSFETs. A charge pump may be easily implemented to support 5V only systems. Multiple MOSFETs may be paralleled to reduce losses and improve efficiency and thermal management. Voltage applied to the MOSFET gate depends on the appli- cation circuit used. The gate driver output is specified to drive to within 1.5V of ground when in the low state and to within 2V of its bias supply when in the high state. In prac- tice, the MOSFET gate will be driven rail to rail due to overshoot caused by the capacitive load it presents to the controller IC. For the typical application where VCC1 = VCC2 = 12V and 5V is used as the source for the regulator output current, the following gate drive is provided; VGATE = 12V - 5V = 7V (see Figure 15). Trace 3 = 12V Input (VCC1) and VCC2) (10V/div.) Trace 4 = 5V Input (2V/div.) Trace 1 = Regulator Output Voltage (1V/div.) Trace 2 = Power Good Signal (2V/div.) VOUT CS5156 R1 10k R2 6.2k R3 10k Power Good 5V PN3904 PN3904 (R1 + R2) × 0.65V R2 Shutdown Input 5V VFFB CS5156 SS 5 8 IN4148 MMUN2111T1 (SOT-23) |
Ähnliche Teilenummer - CS5156GN16 |
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Ähnliche Beschreibung - CS5156GN16 |
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