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YB1692 데이터시트 PDF




YOBON TECHNOLOGIES에서 제조한 전자 부품 YB1692은 전자 산업 및 응용 분야에서
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부품번호 YB1692 기능
기능 2A Synchronous Step-Down Converter
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YB1692 데이터시트, 핀배열, 회로
YB1692
2A Synchronous Step-Down Converter
Description
The YB1692 is a monolithic synchronous
buck regulator. The device integrates
130mMOSFETS that provide 2A
continuous load cur- rent over a wide
operating input voltage of 4.75V to 18V.
Current mode control provides fast
transient response and cycle-by-cycle cur-
rent limit.
An adjustable soft-start prevents inrush
current at turn-on. In shutdown mode, the
supply cur- rent drops below 1μA.
This device, available in an 8-pin SOP
pack- age, provides a very compact system
solution with minimal reliance on external
components.
Features
„ 2A Output Current
„ Wide 4.75V to 18V Operating Input
Range
„ Integrated 130mPower MOSFET
Switches
„ Output Adjustable from 0.923V to 15V
„ Up to 93% Efficiency
„ Programmable Soft-Start
„ Stable with Low ESR Ceramic Output
Capaci- tors
„ Fixed 340KHz Frequency
„ Cycle-by-Cycle Over Current
Protection
„ Input Under Voltage Lockout
„ Thermally Enhanced 8-Pin SOP
Package
Applications
„ Distributed Power Systems
„ Networking Systems
„ FPGA, DSP, ASIC Power Supplies
„ Green Electronics/ Appliances
„ Notebook Computers
Typical Application Circuit
YB1692 Rev.1.0
Figure1 Typical Application Circuit
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YB1692 pdf, 반도체, 판매, 대치품
BLOCK DIAGRAM
YB1692
2A Synchronous Step-Down Converter
Figure 3
FUNCTIONAL DESCRIPTIONS
The YB1692 is a synchronous rectified, cur-
rent-mode,step-down regulator. It regulates
in- put voltages from 4.75V to 18V down to an
out- put voltage as low as 0.923V,and
supplies up to 2A of load current.
The YB1692 uses current-mode control to
regulate the output voltage. The output
voltage is measured at FB through a resistive
voltage di- vider and amplified through the
internal trans- conductance error amplifier.
The voltage at the COMP pin is compared to
the switch current measured internally to
control the output voltage.
The converter uses internal N-Channel
MOSFET switches to step-down the input
voltage to the regu- lated output voltage.Since
the high side MOSFET requires a gate
voltage greater than
the input voltage, a boost capacitor connected
between SW and BS is needed to drive the
high side gate. The boost capaci- tor is
charged from the internal 5V rail when SW is
low.
When the YB1692 FB pin exceeds 20% of the
nominal regulation voltage of 0.923V, the over
volt- age comparator is tripped and the COMP
pin and the SS pin are discharged to
GND,forcing the high-side switch off.
YB1692 Rev.1.0
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YB1692 전자부품, 판매, 대치품
YB1692
2A Synchronous Step-Down Converter
The goal of compensation design is to shape
the converter transfer function to get a desired
loop gain. The system crossover frequency
where the feedback loop has the unity gain is
important. Lower crossover frequencies result
in slower line and load transient responses,
while higher crossover frequencies could
cause system insta- bility. A good rule of
thumb is to set the cross- over frequency
below one-tenth of the switching frequency.
To optimize the compensation components,
the following procedure can be used.
1.Choose the compensation resistor (R3) to
set the desired crossover frequency.
Determine the R3 value by the following
equation:
Where fC is the desired crossover frequency
which is typically below one tenth of the
switch- ing frequency.
2. Choose the compensation capacitor (C3) to
achieve the desired phase margin. For
applica- tions with typical inductor values,
setting the compensation zero, fZ1, below
one-forth of the crossover frequency provides
sufficient phase margin.Determine the C3
value by the following equa- tion:
Where R3 is the compensation resistor.
3. Determine if the second compensation
capacitor (C6) is required. It is required if the
ESR zero of the output capacitor is located at
less than half of the switching frequency, or
the following rela- tionship is valid:
If this is the case, then add the second
compensation capacitor (C6) to set the pole
fP3 at the location of the ESR zero.
Determine the C6 value by the equation:
External Bootstrap Diode
It is recommended that an external bootstrap
diode be added when the system has a 5V
fixed input or the power supply generates a
5V output. This helps im- prove the efficiency
ofthe regulator. The bootstrap diode can be a
low cost one such as IN4148 or BAT54.
Figure 4 External Bootstrap Diode
This diode is also recommended for high duty
cycle operation (when
voltage (VOUT>12V) applications.
)output
Typical Performance Characteristics
Figure 5 YB1692 with AVX 47μF, 6.3V Ceramic Output Capacitor
YB1692 Rev.1.0
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관련 데이터시트

부품번호상세설명 및 기능제조사
YB1692

2A Synchronous Step-Down Converter

YOBON TECHNOLOGIES
YOBON TECHNOLOGIES
YB1693

3A Synchronous Step-Down Converter

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