Datasheet > UP1723PRUA

UP1723PRUA

更新时间： 2024-02-24 03:32:49

品牌	Logo	应用领域
力智 - UPI		/
页数	文件大小	规格书
16页	268K
描述
2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter

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UP1723PRUA 数据手册

uP1723

Functional Description

Output Voltage Setting and Feedback Network

Over Voltage Protection

For the adjustable output version, the output voltage can The uP1723 continuously monitors FB voltage for over

be set from VREF to VIN by a voltage divider as:

voltage protection. When V_FB> 1.1V (typical), the uP1723

triggers over voltage protection and the low-side MOSFET

is turned on while high-side MOSFET is turned off to

discharge the output voltage. At any time if the OVP

condition is relieved, the uP1723 will restart the soft start

0.925 ×

(

R1+ R2

)

V_OUT

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.

sequence.

Over Temperature Protection

The OTP is triggered and shuts down the uP1723 if the

junction temperature is higher than 150^OC. The OTP is a

non-latch type protection. The uP1723 automatically

initiates another soft start cycle if the junction temperature

drops below 120^OC.

Current Limit Function

The uP1723 continuously monitors the inductor current

for current limit by sensing the voltage drop across the

upper switch when it turns on. When the inductor current

is higher than current limit threshold (4A typical), the

current limit function activates and forces the upper switch

turning off to limit inductor current cycle by cycle. If the

load continuously demands more current than what

uP1723 could provide, uP1723 will not be able to regulate

the output voltage, and the output voltage will drop

accordingly. Eventually, under voltage protection will be

triggered if V_FBis lower than UVP threshold.

When the output is shorted to ground, the current limit

function activates immediately, and VOUT will be pulled

down very fast. Eventually the under voltage protection

will be triggered, and the IC will shut down to protect

external components. The IC will restart after the UVP

retry delay, and the above behavior may repeat if the output

short condition is not released. This is the so-called Short

Circuit Protection (SCP).

Under Voltage Protection

The uP1723 continuously monitors FB voltage for under

voltage protection. When V_FB< 0.4V (typical), the uP1723

triggers under voltage protection and enters frequency

decay mode which the switching frequency of the

uP1723 will decrease linearly according to the FB voltage

drop. Eventually when V_FB= 0V, the switching frequency

of the uP1723 will be clamped at 100kHz. After triggering

UVP, the SS voltage is also discharged to 0V. After V_SS

0V, the uP1723 will try to re-soft-start to establish the

output voltage once again. In the end of re-soft-start (V_SS

= 1.2V), if the UVP condition is still not relieved, the

uP1723 will turn-off all high-side and low-side MOSFETs

and re-try to soft start every 8ms.

uP1723-DS-P0001, Jan. 2015

www.upi-semi.com

1 2 3 456 7 8...16

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与UP1723PRUA相关器件

型号	品牌	获取价格	描述	数据表
UP1723PSA8	UPI	获取价格	2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter
UP1723PSU8	UPI	获取价格	2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter
UP1724	UPI	获取价格	2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter
UP1724PSU8	UPI	获取价格	2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter
UP1724QSU8	UPI	获取价格	2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter
UP1724RSU8	UPI	获取价格	2A, 18V, High-Efficiency Synchronous-Rectified Buck Converter
UP1727	UPI	获取价格	1.0MHz, 3.0A, High-Efficiency Synchronous-Rectified Buck Converter
UP1727PDDA	UPI	获取价格	1.0MHz, 3.0A, High-Efficiency Synchronous-Rectified Buck Converter
UP1727PSW8	UPI	获取价格	1.0MHz, 3.0A, High-Efficiency Synchronous-Rectified Buck Converter
UP1727Q	UPI	获取价格	1.0MHz, 3.0A, High-Efficiency Synchronous-Rectified Buck Converter

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