Datasheet > UPS1604

UPS1604

更新时间： 2022-09-15 11:00:28

品牌	Logo	应用领域
友顺 - UTC		开关电源开关
页数	文件大小	规格书
12页	640K
描述
HIGH PERFORMANCE CURRENT MODE POWER SWITCH

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UPS1604 数据手册

UPS1604

LINEAR INTEGRATED CIRCUIT

FUNCTIONAL DESCRIPTION(Cont.)

(2) Switch Frequency Set

The maximum switch frequency is set to 68kHz. Switch frequency is modulated by output power P_OUTduring IC

operating. At no load or light load condition, most of the power dissipation in a switching mode power supply is from

switching loss on the MOSFET transistor, the core loss of the transformer and the loss on the subber circuit. The

magnitude of power loss is in proportion to the number of switching events within a fixed period of time. So lower

switch frequency at lower load, which more and more improve IC’s efficiency at light load. At from no load to light

load condition, the IC will operate at from Burst mode to Reducing Frequency Mode. The relation curve between f_SW

and P_OUT/P_{OUT (MAX)}as followed FIG.4.

FIG.4 The relation curve between f_SWand relative output power P_OUT/ P_{OUT (MAX)}

(3) Internal Synchronized Slope Compensation

Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM

generation, this greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus

reduces the output ripple voltage.

(4) Frequency Hopping For EMI Improvement

The Frequency hopping is implemented in the IC; there are two oscillators built-in the IC. The first oscillator

is to set the normal switching frequency; the switching frequency is modulated with a period signal generated by the

2nd oscillator. The relation between the first oscillator and the 2nd oscillator as followed FIG.5. So the tone energy is

evenly spread out, the spread spectrum minimizes the conduction band EMI and therefore eases the system design

in meeting stringent EMI requirement.

FIG.5 Frequency Hopping

UNISONIC TECHNOLOGIES CO., LTD

7 of 12

QW-R119-017.C

www.unisonic.com.tw

1...4 5 678 9 10...12

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型号	品牌	描述	获取价格	数据表
UPS1604G-D08-T	UTC	HIGH PERFORMANCE CURRENT MODE POWER SWITCH	获取价格
UPS1604L-D08-T	UTC	HIGH PERFORMANCE CURRENT MODE POWER SWITCH	获取价格
UPS160E3	MICROSEMI	Rectifier Diode, Schottky, 1 Element, 1A, 60V V(RRM), Silicon, DO-216AA, ROHS COMPLIANT, P	获取价格
UPS160E3/TR13	MICROSEMI	Rectifier Diode, Schottky, 1 Element, 1A, 60V V(RRM), DO-216AA, ROHS COMPLIANT, PLASTIC, P	获取价格
UPS160E3/TR7	MICROSEMI	Rectifier Diode, Schottky, 1 Element, 1A, 60V V(RRM), DO-216AA, ROHS COMPLIANT, PLASTIC, P	获取价格
UPS160TR13E3	MICROSEMI	Rectifier Diode, DO-216AA, ROHS COMPLIANT, PLASTIC, POWERMITE 1, 2 PIN	获取价格