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LD7576JPN 数据表(PDF) 10 Page - Leadtrend Technology

部件名 LD7576JPN
功能描述  Green-Mode PWM Controller
Download  22 Pages
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制造商  LEADTREND [Leadtrend Technology]
网页  https://www.leadtrend.com.tw/
标志 LEADTREND - Leadtrend Technology

LD7576JPN 数据表(HTML) 10 Page - Leadtrend Technology

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LD7576/76H/76J/76K
10
Leadtrend Technology Corporation
www.leadtrend.com.tw
LD7576-DS-04a
December 2009
Application Information
Operation Overview
As long as the green power requirement becomes a trend
and the power saving is getting more and more important
for switching power supplies and switching adaptors, the
traditional PWM controllers are not able to support such
new requirements. Furthermore, the cost and size
limitation forces the PWM controllers to powerfully
integrate more functions, thereby reducing the external
part count.
The LD7576X series is ideal for these
applications to provide an easy and cost effective solution;
and its detailed features are described as below.
Internal High-Voltage Startup Circuit and
Under Voltage Lockout (UVLO)
R1
OUT
CS
VCC
GND
LD7576X
C1
Cbulk
D1
Rs
COMP
Vin
HV
Fig. 13
Traditional circuits provide the startup current through a
startup resistor to power up the PWM controller.
Nevertheless, it consumes too significant power to meet
the current power saving requirement. In most cases,
startup resistors carry large resistance, which causes
longer startup time.
To achieve the optimized topology, as shown in figure 13,
LD7576X series is implemented with a high-voltage
startup circuit for such requirement. During startup, a
high-voltage current source sinks current from the bulk
capacitor to provide the startup current as well as to
charge the Vcc capacitor C1.
During the startup
transient when the Vcc is lower than the UVLO threshold,
the high-voltage current source is enabled to supply 1mA
current.
Meanwhile, the Vcc supply current is as low as
100
μA such that most of the HV current is adopted to
charge the Vcc capacitor.
By using such configuration,
the turn-on delay time will be almost the same no matter
under low-line or high-line condition.
As the Vcc voltage rises higher than UVLO(on) to power
on the LD7576X series and further to deliver the gate
drive signal, the high-voltage current source is disabled
and the supply current is solely provided from the auxiliary
winding of the transformer.
Therefore, it eliminates the
power loss on the startup circuit and performs highly
power saving.
An UVLO comparator is embedded to detect the voltage
on the Vcc pin and to ensure the supply voltage high
enough to power on the LD7576X series PWM controller
and to drive the power MOSFET.
As shown in Fig. 14, a
hysteresis is provided to prevent undesired shutdown
from the voltage dip during startup.
The turn-on and
turn-off threshold levels are set at 16V and 10.0V,
respectively.
Vcc
UVLO(on)
UVLO(off)
t
t
HV Current
1mA
Startup Current
(<100uA)
Vcc current
~ 0mA (off)
Operating Current
(Supply from Auxiliary Winding)
Fig. 14


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