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PDF LD7750AGR Data sheet ( Hoja de datos )

Número de pieza LD7750AGR
Descripción High Voltage Green-Mode PWM Controller
Fabricantes Leadtrend 
Logotipo Leadtrend Logotipo



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No Preview Available ! LD7750AGR Hoja de datos, Descripción, Manual

LD7750A
06/25/2010
High Voltage Green-Mode PWM Controller with
Over Temperature Protection
Rev. 00
General Description
The LD7750A integrates several functions of protections,
and EMI-improved solution in a tiny package to minimize
the component counts and the circuit space.
The device provides functions of low startup current,
green-mode power-saving operation, leading-edge
blanking of the current sensing and internal slope
compensation. Also, the LD7750A features more
protections like OLP (Over Load Protection), OVP (Over
Voltage Protection), and OTP (Over Temperature
Protection) to prevent the circuit being damaged under
abnormal conditions. The LD7750A features built-in
auto-recovery function for OVP on Vcc pin and OLP.
Furthermore, the LD7750A features frequency swapping
to depress radiation noise, providing an excellent solution
for EMI filter design.
Features
z High-Voltage (500V) Startup Circuit
z Current Mode Control
z Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Internal Frequency swapping
z Internal Slope Compensation
z Internal Over Current Protection
z OVP (Over Voltage Protection) on Vcc
z OLP (Over Load Protection)
z External OTP through a NTC
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
Leadtrend Technology Corporation
LD7750A-DS-00 June 2010
1
www.leadtrend.com.tw

1 page




LD7750AGR pdf
Electrical Characteristics
(TA = +25°C unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
High-Voltage Supply (HV Pin)
High-Voltage Current Source
Off-State Leakage Current
Supply Voltage (Vcc Pin)
Startup Current
VCC< UVLO(on), HV=500V
VCC> UVLO(off), HV=500V
Operating Current
(with 1nF load on OUT pin)
VCOMP=0V
VCOMP=3V,
OLP tripped
OVP tripped, VCC=OVP
UVLO (off)
UVLO (on)
OVP Level
Voltage Feedback (COMP Pin)
Short Circuit Current
Open Loop Voltage
VCOMP=0V
COMP pin open
Green Mode Threshold VCOMP
Zero Duty
Current Sensing (CS Pin)
Maximum Input Voltage,Vcs_off
Leading Edge Blanking Time
Input impedance
Delay to Output
LD7750A
MIN TYP MAX UNITS
0.5 1.0 1.5 mA
35 μA
200 320 400
1.2
2.3
0.61
0.70
9.0 10.0 11.0
15.0 16.0 17.0
25.0 26.0 27.0
μA
mA
mA
mA
mA
V
V
V
0.2 0.26 0.32 mA
5.5 6.0
V
2.75 V
2.0 V
0.80 0.85 0.90
V
250 ns
1 MΩ
100 ns
Leadtrend Technology Corporation
LD7750A-DS-00 June 2010
5
www.leadtrend.com.tw

5 Page





LD7750AGR arduino
Fig. 15
Fig. 16
LD7750A
Internal Slope Compensation
Stability is crucial for current mode control when it
operates at more than 50% of duty-cycle. To stabilize the
control loop, the slope compensation is required in the
traditional UC384X design by injecting the ramp signal
from the RT/CT pin through a coupling capacitor. In the
LD7750A, the internal slope compensation circuit has
been implemented to simplify the external circuit design.
On/Off Control
The LD7750A can be turned off by pulling COMP pin to
lower than 2.0V. The gate output pin of LD7750A will be
disabled immediately under such condition. The off-mode
can be released when the pull-low signal is removed.
Green-Mode Operation
By using the green-mode control, the switching frequency
can be reduced under the light load condition. This feature
helps to improve the efficiency in light load conditions.
The green-mode control is Leadtrend Technology’s own
IP.
Over Load Protection (OLP) - Auto
Recovery
To protect the circuit from damage caused by overload
condition or output short condition, a smart OLP function
is implemented in the LD7750A for it. The OLP function in
LD7750A is an auto-recovery type protection. Fig. 17
shows the waveforms of the OLP operation. Under such
fault condition, the feedback system will force the voltage
loop toward saturation and thus pull the voltage on COMP
pin (VCOMP) to high. Whenever the VCOMP trips the
OLP threshold of 5.0V and stays for over 64mS, the
protection will be activated to turn off the gate output and
to shutdown the switching of power circuit. The 64mS
delay time is to prevent the false-trigger during the
power-on and turn-off transient.
Leadtrend Technology Corporation
LD7750A-DS-00 June 2010
11
www.leadtrend.com.tw

11 Page







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