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LD7576 数据表(PDF) 15 Page - Leadtrend Technology

部件名 LD7576
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

LD7576 数据表(HTML) 15 Page - Leadtrend Technology

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LD7576/76H/76J/76K
15
Leadtrend Technology Corporation
www.leadtrend.com.tw
LD7576-DS-04a
December 2009
of the equivalent short-circuit induced by such latchup
behavior.
Leadtrend’s proprietary of Hi-V technology eliminate
parasitic SCR in LD7576X series.
Figure 24 shows the
equivalent circuit of LD7576X series of Hi-V structure.
Accordingly, LD7576X series is more capable to sustain
negative voltage than other similar products. Nevertheless,
a 40K
Ω resistor is recommended to be added on the Hi-V
path to play as a current limit resistor whenever a negative
voltage is applied.
Fig. 23
Fig. 24
Frequency Trembling
The LD7576X series are built in with adjustable frequency
trembling function, which provides the power supply
designers to optimize EMI performance and system cost.
The Trembling frequency was internally set for
±4KHz
when incorporating with 65KHz switching frequency.
On
the other hand, the modulating frequency can be set by
adjusting the capacitance value on the CT pin. The best
value for the CT capacitance is from 0.047
μF to 0.1μF,
typically generating modulating frequency of 200Hz
~100Hz. It is a tradeoff to select proper CT value between
the EMI performance and OLP delay time.
In theory,
higher CT value will accompany with longer OLP delay
time.
It is strongly recommended to use higher quality capacitor
(low temperature coefficient and low initial tolerance) like
X7R type ceramic capacitor to avoid the variation on the
EMI performance under different temperature conditions.
As show in figure 25, short layout loop from CT to GND is
prefer to prevent any unexpected parasitic effect or
coupling noises.
And beware not to connect any extra
loading to CT pin except of the capacitor to minimize the
affect on modulating frequency.
Fig. 25
On-Chip OTP
An
internal
OTP
circuit
is
embedded
inside
the
LD7576/76J to provide the worst-case protection for this
controller. When the chip temperature rises higher than
the trip OTP level, the output will be disabled until the chip
is cooled down below the hysteresis window
On-Chip OTP – Latch - Mode
Similar with the behaviors like OLP and OVP on Vcc
latch-mode, an internal OTP circuit is embedded within
the LD7576H/76K to provide the worst-case protection for
this controller. When the chip temperature rises higher
than the trip OTP level, it shuts down the output gate drive
circuit simultaneously to latch off the switching of the
power MOSFET. It won’t recover unless the chip is cooled
down below the OTP threshold and recycle again.


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