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UC2826 数据表(PDF) 1 Page - Texas Instruments

部件名 UC2826
功能描述  Secondary Side Average Current Mode Controller
Download  12 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

UC2826 数据表(HTML) 1 Page - Texas Instruments

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UC1826
UC2826
UC3826
DESCRIPTION
The UC1826 family of average current mode controllers accurately accom-
plishes secondary side average current mode control. The secondary side
output voltage is regulated by sensing the output voltage and differentially
sensing the AC switching current. The sensed output voltage drives a volt-
age error amplifier. The AC switching current, monitored by a current sense
resistor, drives a high bandwidth, low offset current error amplifier. The out-
put of the voltage error amplifier can be used to drive the current amplifier
which filters the measured inductor current. Fast transient response is ac-
complished by utilizing voltage feedforward in generating the PWM ramp.
The UC1826 features load share, oscillator synchronization, undervoltage
lockout, and programmable output control. Multiple chip operation can be
achieved by connecting up to ten UC1826 chips in parallel. The SHARE
bus and CLKSYN bus provide load sharing and synchronization to the fast-
est oscillator respectively. With its tailored bandwidth, the UC1826 provides
excellent noise immunity and is an ideal controller to achieve high power,
secondary side average current mode control.
Secondary Side Average Current Mode Controller
FEATURES
Practical Secondary Side Control of
Isolated Power Supplies
1MHz Operation
Tailored Loop Bandwidth Provides
Excellent Noise Immunity
Voltage Feedforward Provides
Superior Transient Response
Accurate Programmable Maximum
Duty Cycle
Multiple Chips Can be Synchronized
to Fastest Oscillator
Wide Gain Bandwidth Product
(70MHz, Acl>10) Current Error
Amplifier
Up to Ten Devices Can Easily Share
a Common Load
SLUS331 - JULY 1995
BLOCK DIAGRAM
UDG-95013
Pin Numbers refer to 24-pin packages.


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