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PDF LD7750HGR Data sheet ( Hoja de datos )

Número de pieza LD7750HGR
Descripción High Voltage Green-Mode PWM Controller
Fabricantes Leadtrend 
Logotipo Leadtrend Logotipo



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No Preview Available ! LD7750HGR Hoja de datos, Descripción, Manual

LD7750H
3/8/2011
High Voltage Green-Mode PWM Controller with
Over Temperature Protection
Rev. 00
General Description
The LD7750H integrates several functions of protections,
and EMI-improved solution in a SOP-8/or DIP-8 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 LD7750H features more
protections like OLP (Over Load Protection), OVP (Over
Voltage Protection), and OTP (Over Temperature
Protection) to prevent the circuit being damaged under the
abnormal conditions. The LD7750H features built-in latch
function for OVP on Vcc pin and OLP.
Furthermore, the LD7750H 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
LD7750H-DS-00 March 2011
1
www.leadtrend.com.tw

1 page




LD7750HGR 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
Operating Current
(with 1nF load on OUT pin)
UVLO (off)
UVLO (on)
OVP Level
VCC< UVLO(on), HV=500V
VCC> UVLO(off), HV=500V
VCOMP=0V
VCOMP=3V,
OLP tripped
OVP tripped, VCC=OVP
Voltage Feedback (COMP Pin)
Short Circuit Current
Open Loop Voltage
Green Mode Threshold VCOMP
Zero Duty
VCOMP=0V
COMP pin open
Current Sensing (CS Pin)
Maximum Input Voltage, Vcs_off
Leading Edge Blanking Time
Input impedance
Delay to Output
Oscillator for Switching Frequency
Frequency
Green Mode Frequency
Trembling Frequency
Temp. Stability
-20°C~85°C
Voltage Stability
(VCC=11V-25V)
OTP Pin Latch Protection (OTP Pin)
OTP Pin Source Current
Turn-On Trip Level
Turn-Off Trip Level
De-latch VCC Level
(PDR, Power Down Reset)
LD7750H
MIN TYP MAX UNITS
0.5 1.0 1.5 mA
35 μA
200 320 400
1.2
2.3
0.63
0.72
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
0.20 0.26 0.32
5.5 6.0
2.75
2.0
mA
V
V
V
0.80 0.85 0.90
V
250 ns
1 MΩ
100 ns
61.0 65.0 69.0 kHz
20 kHz
±4 kHz
5%
1%
92 100 108
1.00 1.05 1.10
0.90 0.95
1.0
8.0
μA
V
V
V
Leadtrend Technology Corporation
LD7750H-DS-00 March 2011
5
www.leadtrend.com.tw

5 Page





LD7750HGR arduino
Fig. 15
Fig. 16
LD7750H
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
LD7750H, the internal slope compensation circuit has
been implemented to simplify the external circuit design.
On/Off Control
The LD7750H can be turned off by pulling COMP pin to
lower than 2.0V. The gate output pin of LD7750H 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) - Latch mode
The LD7750H features latch mode of smart OLP
protection. Figure 17 shows the waveform under fault
condition. The feedback system will force the voltage loop
toward the saturation and thus pull the voltage high on
COMP pin (VCOMP). When the VCOMP ramps up to the
OLP threshold of 5.0V and stays for longer than OLP
delay time, the protection will be activated and then latch
off the gate output to stop switching of the power circuit.
The delay time is to prevent the false-triggering from
power-on, turn-off transient and peak load condition. As
soon as the over load condition is removed, the controller
will be kept latched until the Vcc drops lower than 8V. It is
necessary to start another AC power-on recycling to get
the output back.
Leadtrend Technology Corporation
LD7750H-DS-00 March 2011
11
www.leadtrend.com.tw

11 Page







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