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uP1715 데이터시트 PDF




uPI Semiconductor에서 제조한 전자 부품 uP1715은 전자 산업 및 응용 분야에서
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부품번호 uP1715 기능
기능 340K High-Efficiency Synchronous-Rectified Buck Converter
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uP1715 데이터시트, 핀배열, 회로
Conceptual
uP1715
2A, 23V, 340K High-Efficiency
Synchronous-Rectified Buck Converter
General Description
Features
The uP1715 is a high-efficiency synchronous-rectified † 4.5V to 23V Input Voltage Range
buck converter with internal power switch. With internal † Adjustable Output from 0.925V to 20V
low RDS(ON) switches, the high-efficiency buck converter
is capable of delivering 2A output current over a wide input
†
2A Output Current
voltage range from 4.5V to 23V. The output voltage is † Accurate Reference: 0.925V ( + 1.5%)
adjustable from 0.925V to 20V by a voltage divider. Other † Up to 93% Conversion Efficiency
features for the buck converter include adjust soft-start,
chip enable, over-voltage, under-voltage, over- † Integrated Low RDS(ON) Upper and Lower MOSFET
temperature and over-current protections. It is available
Switches: 130mΩ
in a space saving SOP-8L package.
† Current Mode PWM Operation
Applications
†
†
Constant 340kHz Fixed-Frequency Operation
Programmable Soft-Start
† Battery-Powered Portable Devices
† Integrated Boot Diode
„ MP3 Players
† Over Voltage and Under Voltage Protection
„ Digital Still Cameras
† Over Temperature and Over Current Protection
„ Wireless and DSL Modems
† SOP-8L Package
„ Personal Information Appliances
† RoHS Compliant and Halogen Free
† 802.11 WLAN Power Supplies
† FPGA/ASIC Power Supplies
Pin Configuration
† Laptop, Palmtops, Notebook Computers
† Portable Information Appliances
Ordering Information
BOOT
VIN
LX
1
2
3
8 SS
7 EN
6 COMP
Order Number Package Type
Remark
GND
4
5 FB
uP1715PSA8
SOP-8L
SOP - 8L
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C03, File Name: uP1715-DS-C0300
1




uP1715 pdf, 반도체, 판매, 대치품
Conceptual
uP1715
Functional Description
The integrated high efficiency synchronous-rectified buck
converter with internal power switches. With internal low
RDS(ON) switches, it is capable of delivering 2A output
current over a wide input voltage range from 4.5V to 23V.
The output voltage is adjustable from 0.925V to 20V by a
voltage divider. Other features include Programmable soft-
start, chip enable, overvoltage, under-voltage, over-
temperature and over-current protections.
Input Supply Voltage, VIN
VIN supplies current to internal control circuits and output
voltages. The supply voltage range is from 4.5V to 23V. A
power on reset (POR) continuously monitors the input
supply voltage. The POR level is typically 4.0V at VIN
rising. The buck converter draws pulsed current with sharp
edges each time the upper switch turns on, resulting in
voltage ripples and spikes at supply input. A minimum
10uFx2 ceramic capacitor with shortest PCB trace is highly
recommended for bypassing the supply input.
Chip Enable/Disable and Soft Start
Pulling EN pin lower than 0.4V shuts down the buck
converter and reduces its quiescent current lower than
1uA. In the shutdown mode, both upper and lower
switches are turned off. Pulling EN pin higher than 2.7V
enables the buck converter and initiates the soft start cycle.
The uP1715 features programmable soft start function to
limit the inrush current from supply input by a soft start
capacitor CSS connected to SS pin as shown in Figure
1.The CSS is charged to VIN by a 6uA current source when
EN pin is taken high. The VSSE voltage is clamped to VSS
with a threshold voltage of NMOSFET.
The error amplifier is a tri-input device. VSSE or VREF
whichever is smaller dominates the non-inverting inputs
of the error amplifier. The VSSE voltage starts ramping up
when VSS is higher than about 0.7V. The VFB voltage will
follow the VSSE and ramp up linearly. When VSSE is higher
than VREF, the uP1715 asserts soft start end and the VFB
voltage is regulated to VREF. Soft start end also initiates
the output under voltage protection
VIN
SS
FB
6uA
VSS
VSSE
VREF
COMP
Main Control Loop
The uP1715 adopts slope-compensated, current mode
PWM control. During normal operation, the uP1715
operates at PWM mode to regulate output voltage by
transferring the power to the output voltage cycle by cycle
at a constant frequency. The uP1715 turns on the upper
switch at each rising edge of the internal oscillator allowing
the inductor current to ramp up linearly. The switch remains
on until either the current limit is tripped or the PWM
comparator turns off the switch for regulating output
voltage.
The lower switch turns on with optimal dead time and picks
up the inductor current after the upper switch turns off
allowing the inductor current to ramp down linearly. The
switch remains on until the next rising edge of oscillator
turns on the upper switch. The uP1715 regulates the
output voltage by controlling the ramp up/down duty cycle
of inductor current. The high frequency switching ripple is
easily smoothed by the output filter.
The upper switch current is sensed, slope compensated
and compared with the error amplifier output COMP to
determine the adequate duty cycle. The feedback voltage
VFB is sensed through a resistive voltage divider and
regulated to internal 0.925V reference voltage. The error
amplifier amplifies and compensates voltage variation to
get appropriate COMP pin voltage.
When the load current increases, it causes a slight
decrease in the feedback voltage relative to the 0.925V
reference, which in turn, causes the error amplifier output
voltage to increase until the average inductor current
matches the new load current.
Output Voltage Setting and Feedback Network
For the adjustable output version, the output voltage can
be set from VREF to VIN by a voltage divider as:
VOUT
=
0.925V × R1+ R2
R2
The internal VREF is 0.925V with 1.5% accuracy. In real
applications, a 22pF feed-forward ceramic capacitor is
recommended in parallel with R1 for better transient
response.
Over Temperature Protection
The OTP is triggered and shuts down the uP1715 if the
junction temperature is higher than 160OC. The OTP is a
non-latch type protection. The uP1715 automatically
initiates another soft start cycle if the junction temperature
drops below 130OC.
Figure 1. uP1715 Soft Start
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C03, File Name: uP1715-DS-C0300
4

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uP1715 전자부품, 판매, 대치품
Conceptual
uP1715
Typical Operation Characteristics
This page is intentionally left blank and will be updated later.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C03, File Name: uP1715-DS-C0300
7

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