參數(shù)資料
型號(hào)： CS5165GDWR16
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 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)： 5/21頁(yè)
文件大小： 718K
代理商： CS5165GDWR16
CS5165
http://onsemi.com
13
current suddenly increases from its minimum level, the
output capacitor is prepositioned +40 mV. Conversely,
when load current suddenly decreases from its maximum
level, the output capacitor is prepositioned 40 mV (see
Figures 15, 16, and 17). For best Transient Response, a
combination of a number of high frequency and bulk output
capacitors are usually used.
If the Maximum OnTime is exceeded while responding
to a sudden increase in Load current, a normal offtime
occurs to prevent saturation of the output inductor.
Figure 15. Output Voltage Transient Response to
a 14 A Load Pulse, VOUT = +2.84 V (DAC = 10111)
Trace 4 VOUT (100 mV/div.)
Trace 3 Load Current (5.0 A/10 mV/div.)
Figure 16. Output Voltage Transient Response to a
14 A Load Step, VOUT = +2.84 V (DAC = 10111)
Trace 1 GATE(H) (10 V/div.)
Trace 2 Inductor Switching Node (5.0 V/div.)
Trace 3 Load Current (5.0 A/div)
Trace 4 VOUT (100 mV/div.)
Figure 17. Output Voltage Transient Response to a 14
A Load TurnOff, VOUT = +2.84 V (DAC = 10111)
Trace 1 GATE(H) (10 V/div.)
Trace 2 Inductor Switching Node (5.0 V/div.)
Trace 3 Load Current (5.0 A/div)
Trace 4 VOUT (100 mV/div.)
PROTECTION AND MONITORING FEATURES
Short Circuit Protection
A lossless hiccup mode short circuit protection feature is
provided, requiring only the Soft Start capacitor to
implement. If a short circuit condition occurs the VFB low
comparator sets the FAULT latch. This causes the top FET
to shut off, disconnecting the regulator from it’s input
voltage. The Soft Start capacitor is then slowly discharged
by a 2.0 μA current source until it reaches it’s lower 0.7 V
threshold. The regulator will then attempt to restart
normally, operating in it’s extended off time mode with a
50% duty cycle, while the Soft Start capacitor is charged
with a 60 μA charge current.
If the short circuit condition persists, the regulator output
will not achieve the 1.0 V low VFB comparator threshold
before the Soft Start capacitor is charged to it’s upper 2.5 V
threshold. If this happens the cycle will repeat itself until the
short is removed. The Soft Start charge/discharge current
ratio sets the duty cycle for the pulses (2.0 μA/60 μA =
3.3%), while actual duty cycle is half that due to the
extended off time mode (1.65%).
This protection feature results in less stress to the
regulator components, input power supply, and PC board
traces than occurs with constant current limit protection (see
Figures 18 and 19).
If the short circuit condition is removed, output voltage
will rise above the 1.0 V level, preventing the FAULT latch
from being set, allowing normal operation to resume.
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