參數(shù)資料
型號(hào)： CS5165GDWR16
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 6/21頁(yè)
文件大?。?/td> 718K
代理商： CS5165GDWR16
CS5165
http://onsemi.com
14
Figure 18. Demonstration Board Hiccup Mode Short
Circuit Protection. Gate Pulses are Delivered While
the Soft Start Capacitor Charges, and Cease During
Discharge
M 25.0 ms
Trace 3 Soft Start Timing Capacitor (1.0 V/div.)
Trace 4 5.0 V Supply Voltage (2.0 V/div.)
Trace 2 Inductor Switching Node (2.0 V/div.)
Figure 19. Demonstration Board Startup with
Regulator Output Shorted To Ground
M 50.0 μs
Trace 4 5.0 V from PC Power Supply (2.0 V/div.)
Trace 2 Inductor Switching Node (2.0 V/div.)
Overvoltage Protection
Overvoltage protection (OVP) is provided as result of the
normal operation of the V2 control topology and requires no
additional external components. The control loop responds
to an overvoltage condition within 100 ns, causing the top
MOSFET to shut off, disconnecting the regulator from it’s
input voltage. The bottom MOSFET is then activated,
resulting in a “crowbar” action to clamp the output voltage
and prevent damage to the load (see Figures 20 and 21 ). The
regulator will remain in this state until the overvoltage
condition ceases or the input voltage is pulled low. The
bottom FET and board trace must be properly designed to
implement the OVP function. If a dedicated OVP output is
required, it can be implemented using the circuit in Figure
22. In this figure the OVP signal will go high (overvoltage
condition), if the output voltage (VCORE) exceeds 20% of
the voltage set by the particular DAC code and provided that
PWRGD is low. It is also required that the overvoltage
condition be present for at least the PWRGD delay time for
the OVP signal to be activated. The resistor values shown in
Figure 22 are for VDAC = +2.8 V (DAC = 10111). The VOVP
(overvoltage trippoint) can be set using the following
equation:
VOVP + VBEQ3 1 ) R2
R1
Figure 20. OVP Response to an InputtoOutput
Short Circuit by Immediately Providing 0% Duty
Cycle, CrowBarring the Input Voltage to Ground
M 10.0 μs
Trace 1 Regulator Output Voltage (1.0 V/div.)
Trace 2 Inductor Switching Node 5.0 V/div.)
Trace 4 5.0 V from PC Power Supply (5.0 V/div.)
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