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PDF LD5760A Data sheet ( Hoja de datos )

Número de pieza LD5760A
Descripción High Voltage Green-Mode PWM Controller
Fabricantes Leadtrend Technology 
Logotipo Leadtrend Technology Logotipo



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No Preview Available ! LD5760A Hoja de datos, Descripción, Manual

LD5760A
12/15/2016
High Voltage Green-Mode PWM Controller
with BNO Function
REV. 06
General Description
The LD5760A is a Green Mode PWM IC built-in with
brown-in/ out functions in a SOP-7 or SOP-8 package. It
minimizes the component counts, circuit space, and
reduces the overall material cost for the power
applications.
The LD5760A features HV start, green-mode
power-saving operation, and internal slope compensation,
soft-start functions to minimize the power loss and
enhance the system performance.
With complete protection in it, as OLP (Over Load
Protection), OVP (Over Voltage Protection), fast SCP
(short circuit protection) and brown-in/out protection,
LD5760A prevents the circuit from being damaged under
abnormal conditions.
Furthermore, the LD5760A features frequency swapping
and soft driving function to reduce the noise and improve
EMI.
Features
High-Voltage (650V) Startup Circuit
Built-in Brown-in/out Function on HV pin
Built- in X-Cap Discharge on HV pin
Frequency Swapping for EMI improvement
Non-Audible-Noise Green Mode Control
LEB (Leading-Edge Blanking) on CS Pin
Internal Slope Compensation
Internal OCP Compensation
OVP (Over Voltage Protection) on VCC/CS
OLP (Over Load Protection)
OTP (Over Temperature Protection)
SCP(Short Circuit Protection)
Soft Start
Soft Driving
+300mA/-800mA Driving Capability
Applications
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
LCD Monitor/TV Power
Typical Application
AC
Input
EMI
Filter
~+
~
DC
Output
HV VCC OUT
OTP LD5760A
GND COMP CS
*
Leadtrend Technology Corporation
LD5760A-DS-06 December 2016
1
www.leadtrend.com.tw

1 page




LD5760A pdf
Electrical Characteristics
(TA = +25C unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
High-Voltage Supply (HV Pin)
High-Voltage Current
Source
VCC< VCC_ON,
HV=500V
HV Discharge capability
HV=500V
HV Pin Total Input Current
HV Pin Brown-In Level
VCC > VCC_ON,
HV=500 VDC
HV Pin Brown-out Level
HV Pin BNO Hysteresis
Brown-in De-bounce Time
Brown-out Detection Delay
VHVBI - VHVBO
VCOMP > VZDCH
time
HV Pin Min. Operation
Voltage
X-Cap discharge Detection
VCOMP > VZDCH
Delay time
Supply Voltage (VCC Pin)
Startup Current
HV=500V
Operating Current
(with 1nF load on OUT pin)
VCOMP=3V
VCOMP=0V
Auto recover mode
Latch mode
UVLO(OFF)
UVLO(ON)
PDR
VCC HVBI Level
HV> VHVBI (Fig. 1)
VCC OVP Level
VCC OVP De-bounce Time
LD5760A
12/15/2016
SYMBOL MIN TYP MAX UNITS
IHV
IHV_DIS
IHV_LEAK
VHVBO
VHVBI
ΔVHV
TD_HVBI
TD_HVBO
VHV_MIN
TD_XCAP
2
2
85
74
45
2.8
2.5
95
82
15
170
68
68
3.6 mA
3 mA
35 A
105 VDC
90 VDC
VDC
S
mS
V
mS
ICC_ST
ICC_OP1
ICC_OP2
ICC_OPA
ICC_OPL
VCC_OFF
VCC_ON
VCC_PDR
6
15
VCC_HVBI
VCC_OVP
TD_VCCOVP
27.8
25
1.5
0.3
0.43
0.43
7
16
VCC_OFF
-1.4V
VCC_OFF
+3.8V
28.8
80
50
8
17
29.8
A
mA
mA
mA
mA
V
V
V
V
V
S
Leadtrend Technology Corporation
LD5760A-DS-06 December 2016
5
www.leadtrend.com.tw

5 Page





LD5760A arduino
Application Information
Operation Overview
As long as the requirement for green power becomes a
trend and the power saving is getting more and more
important for the switching power supplies and switching
adaptors, the traditional PWM controllers are not able to
support such new requirements. Due to the cost and
size limit, the PWM controller designer is bound to
integrate with more functions to reduce the external part
counts. The LD5760A is ideal for these applications. Its
detailed features are described as below.
Internal High-Voltage Startup Circuit and
Under Voltage Lockout (UVLO)
The traditional circuit provides the startup current
through a startup resistor to power up the PWM
controller. However, it consumes much significant
power to meet the current power saving requirement. In
most cases, startup resistors carry larger resistance and
spend more time to start up.
To achieve the optimized topology, as shown in Fig. 11,
LD5760A is implemented with a high-voltage startup
circuit for such requirement. At startup, the high-voltage
current source sinks current of AC Line/or Neutral to
provide startup current and charge the capacitor C1
connected to VCC.
At the startup transient, the HV current will supply
around 2.8mA to Vcc capacitor until this VCC voltage
reaches the UVLO threshold VCC. By using such
configuration, the turn-on delay time will be almost same
no matter under low-line or high-line conditions.
AC
Input
EMI
Filter
LD5760A
12/15/2016
~+
~
HV VCC OUT
OTP LD5760A
GND
CS
Fig. 11
As VCC trips UVLO(OFF), HV pin will recharge VCC
capacitor till VCC voltage rises back to UVLO(ON) again.
Since then, HV pin would no longer charge the capacitor
and instead, send a gate drive signal to draw supply
current for VCC from the auxiliary winding of the
transformer. That minimizes the power loss on the
start-up circuit successfully.
An UVLO comparator is embedded to detect the voltage
across the VCC pin to ensure the supply voltage enough
to power on the LD5760A and in addition, to drive the
power MOSFET. As shown in Fig. 12, a hysteresis is
provided to prevent shutdown from the voltage dip
during startup. The turn-on and turn-off threshold level
are set at 16V and 7V, respectively.
Leadtrend Technology Corporation
LD5760A-DS-06 December 2016
11
www.leadtrend.com.tw

11 Page







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