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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： | 3/21页 |
| 文件大小： | 718K |
| 代理商： | CS5165GDWR16 |
CS5165
http://onsemi.com
11
Start Up
Until the voltage on the VCC supply pin exceeds the 3.95 V
monitor threshold, the Soft Start and GATE pins are held
low. The FAULT latch is reset (no Fault condition). The
output of the error amplifier (COMP) is pulled up to 1.0 V by
the comparator clamp. When the VCC pin exceeds the
monitor threshold, the GATE(H) output is activated, and the
Soft Start capacitor begins charging. The GATE(H) output
will remain on, enabling the NFET switch, until terminated
by either the PWM comparator, or the maximum on time
timer.
If the maximum on time is exceeded before the regulator
output voltage achieves the 1.0 V level, the pulse is
terminated. The GATE(H) pin drives low, and the GATE(L)
pin drives high for the duration of the extended off time. This
time is set by the time out timer and is approximately equal
to the maximum on time, resulting in a 50% duty cycle. The
GATE(L) pin will then drive low, the GATE(H) pin will
drive high, and the cycle repeats.
When regulator output voltage achieves the 1.0 V level
present at the COMP pin, regulation has been achieved and
normal off time will ensue. The PWM comparator
terminates the switch on time, with off time set by the COFF
capacitor. The V2 control loop will adjust switch duty cycle
as required to ensure the regulator output voltage tracks the
output of the error amplifier.
The Soft Start and COMP capacitors will charge to their
final levels, providing a controlled turn on of the regulator
output. Regulator turn on time is determined by the COMP
capacitor charging to its final value. Its voltage is limited by
the Soft Start COMP clamp and the voltage on the Soft Start
pin.
Power Supply Sequencing
The CS5165 offers inherent protection from undefined
start up conditions, regardless of the 12 V and 5.0 V supply
power up sequencing. The turn on slew rates of the 12 V and
5.0 V power supplies can be varied over wide ranges without
affecting the output voltage or causing detrimental effects to
the buck regulator.
Figure 10. Demonstration Board Startup in Response
to Increasing 12 V and 5.0 V Input Voltages. Extended
Off Time is Followed by Normal Off Time Operation
when Output Voltage Achieves Regulation to the Error
Amplifier Output.
M 250 μs
Trace 3 12 V Input (VCC) (5.0 V/div.)
Trace 1 Regulator Output Voltage (1.0 V/div.)
Trace 4 5.0 V Input (1.0 V/div.)
Trace 2 Inductor Switching Node (2.0 V/div.)
Figure 11. Demonstration Board Startup Waveforms
Trace 2 COMP PIn (error amplifier output) (1.0 V/div.)
Trace 1 Soft Start Pin (2.0 V/div.)
Trace 4 Regulator Output Voltage (1.0 V/div.)
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