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参数资料
| 型号： | CS5165GDWR16 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOIC-16 |
| 文件页数： | 4/21页 |
| 文件大小： | 718K |
| 代理商： | CS5165GDWR16 |
CS5165
http://onsemi.com
12
Figure 12. Demonstration Board Enable Startup
Waveforms
M 10.0 μs
Trace 1 Regulator Output Voltage (1.0 V/div.)
Trace 2 Inductor Switching Node (5.0 V/div.)
Normal Operation
During normal operation, switch off time is constant and
set by the COFF capacitor. Switch on time is adjusted by the
V2 control loop to maintain regulation. This results in
changes in regulator switching frequency, duty cycle, and
output ripple in response to changes in load and line. Output
voltage ripple will be determined by inductor ripple current
working and the ESR of the output capacitors (see Figures
Figure 13. Normal Operation Showing Output
Inductor Ripple Current and Output Voltage
Ripple, 0.5 A Load, VOUT = +2.84 V (DAC = 10111)
Trace 1 GATE(H) (10 V/div.)
Trace 2 Inductor Switching Node (5.0 V/div.)
Trace 3 Output Inductor Ripple Current (2.0 A/div.)
Trace 4 VOUT ripple (20 mV/div.)
Trace 1 GATE(H) (10 V/div.)
Trace 2 Inductor Switching Node (5.0 V/div.)
Trace 3 Output Inductor Ripple Current (2.0 A/div.)
Trace 4 VOUT ripple (20 mV/div.)
Figure 14. Normal Operation Showing Output
Inductor Ripple Current and Output Voltage
Ripple, ILOAD = 14 A, VOUT = +2.84 V (DAC = 10111)
Transient Response
The CS5165 V2 control loop’s 100 ns reaction time
provides unprecedented transient response to changes in
input voltage or output current. Pulse by pulse adjustment of
duty cycle is provided to quickly ramp the inductor current
to the required level. Since the inductor current cannot be
changed instantaneously, regulation is maintained by the
output capacitor(s) during the time required to slew the
inductor current.
Overall load transient response is further improved
through a feature called “Adaptive Voltage Positioning”.
This technique prepositions the output capacitors voltage
to reduce total output voltage excursions during changes in
load.
Holding tolerance to 1.0% allows the error amplifiers
reference voltage to be targeted +40 mV high without
compromising DC accuracy. A “Droop Resistor”,
implemented through a PC board trace, connects the Error
Amps feedback pin (VFB) to the output capacitors and load
and carries the output current. With no load, there is no DC
drop across this resistor, producing an output voltage
tracking the Error amps, including the +40 mV offset. When
the full load current is delivered, an 80 mV drop is developed
across this resistor. This results in output voltage being
offset 40 mV low.
The result of Adaptive Voltage Positioning is that
additional margin is provided for a load transient before
reaching the output voltage specification limits. When load
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