PWM Controller. LD5761 Datasheet

LD5761 Controller. Datasheet pdf. Equivalent

LD5761 Datasheet
Recommendation LD5761 Datasheet
Part LD5761
Description High Voltage with Two-Level Frequency Green-Mode PWM Controller
Feature LD5761; High Voltage with Two-Level Frequency Green-Mode PWM Controller LD5761 05/28/2015 REV: 01 General .
Manufacture Leadtrend Technology
Datasheet
Download LD5761 Datasheet




Leadtrend Technology LD5761
High Voltage with Two-Level Frequency
Green-Mode PWM Controller
LD5761
05/28/2015
REV: 01
General Description
The LD5761 is a Green Mode PWM IC which is built-in with
brown-in/out functions in a SOP-7/SOP-8 package. The
device could minimize the component counts, circuit space,
and reduces the overall material cost of power applications.
The two-level frequency of operation enables excellent
performance and high efficiency at nominal line. While in
low line, just operate in high-level frequency to reduce BMAX.
Without changing transformer design, the energy loss is
perfectly minimized.
With complete protections in it, like OLP (Over Load
Protection), OVP (Over Voltage Protection), fast OSCP
(Output short circuit protection) and brown-in/out protection,
the LD5761 protects the circuit from being damaged in
abnormal conditions.
Furthermore, the LD5761 features frequency swapping and
soft driving function to minimize the noise and enhance EMI.
Typical Application
AC
Input
EMI
Filter
~+
~
Features
High-Voltage (650V) Start-up Circuit
No-Load Power Consumption <30mW @230Vac
with X-cap discharge
Two-Level Frequency Operation at H/L Line
Built- in Brown-in/out Function on HV pin
Built- in X-Cap Discharge on HV pin
Frequency Swapping for EMI Enhancement
Non-Audible-Noise Green Mode Control
LEB (Leading-Edge Blanking) on CS Pin
Internal Slope Compensation
OVP (Over Voltage Protection) on VCC
OLP (Over Load Protection)
OTP (Over Temperature Protection)
OSCP(Output Short Circuit Protection)
Soft Driving
+300mA/-800mA Driving Capability
Applications
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
LCD Monitor/TV Power
DC
Output
HV VCC OUT
OTP
GND
LD5761
COMP CS
*
Leadtrend Technology Corporation
LD5761-DS-01 May 2015
1
www.leadtrend.com.tw



Leadtrend Technology LD5761
Pin Configuration
SOP-8 (TOP VIEW)
SOP-7 (TOP VIEW)
8 765
TOP MARK
YYWWPP
1 YY2WW3PP4
8 65
TOP MARK
YYWWPP
1 YY2WW3PP4
YY:
WW:
PP:
Year code
Week code
Production code
LD5761
05/28/2015
Ordering Information
Part number
Package
LD5761 GS
SOP-8
LD5761 GR
SOP-7
The LD5761 is ROHS compliant/Green Packaged.
Top Mark
LD5761GS
LD5761GR
Shipping
2500 /tape & reel
2500 /tape & reel
Protection Mode
Part number
LD5761
VCC_OVP
Latch
OSCP
Latch
OLP
Latch
OTP
Latch
Pin Descriptions
PIN NAME
1 OTP
2 COMP
3 CS
4 GND
5 OUT
6 VCC
7 NC
8 HV
FUNCTION
Pulling this pin below 0.95V will force the controller enter into latch mode and it will not
resume until the AC power recycles. Connect a NTC between this pin and ground to achieve
OTP protection function. Let this pin float to disable the latch protection.
Voltage feedback pin. Connect a photo-coupler with it to close the control loop and achieve
the regulation.
Current sense pin, connect it to sense the MOSFET current
Ground
Gate drive output to drive the external MOSFET
Supply voltage pin
Unconnected Pin
Connect this pin to Line/ Neutral of AC main voltage through a resistor to provide the start-up
current for the controller. When VCC voltage increase to trip the point of UVLO(on), this HV
loop will be turned off to reduce the power loss on the start-up circuit.
An internal resistor divider of HV pin will modulate the maximum frequency by control circuit.
After AC disappear for few cycles, HV pin will sink current to discharge X-cap.
Leadtrend Technology Corporation
LD5761-DS-01 May 2015
2
www.leadtrend.com.tw



Leadtrend Technology LD5761
Block Diagram
VCC 6
LD5761
05/28/2015
HV
8
UVLO
UVLO
On/off
PG
+
-
Vcc OK
Internal
Bias&Ref
Vref OK
Protection
Latch
HV CC
Vcc OVP
Comparator
29V -
+
OVP
UVLO OFF -
1.4V
+
-
Discharge
Vcc
PDR
Soft -Drive
6 OUT
COMP 2
CS 3
Bias
RFB
Green
Mode
OSC
Control
HV
Vf 3R
LEB
-
+
R
Σ+
+
VCS,MAX
Discharge
PWM
Comparator
Slope Com.
OCP
Comparator
+
-
COMP
4.7V
+
-
OLP
Comparator
Delay
Time
VCC
OSCP
Delay
Time
S SET Q
R CLR Q
Bias
Ext. OTP
100uA
+ 1 OTP
-
1.05V/0.95
S SET Q
Protection
HV
RBH
RBL
Comp
QRPG ½ Counter
CLR
+
-
X-cap discharge
Debounce
and Delay
Time
OSC
OVP
Protection
Ext. OTP
PDR
S SET Q
R CLR Q
Delay
Time
S SET Q
Discharge
Latch
RBH:RBL
=125:1
+
-
PG
H/L comp
R CLR Q
+
-
Int. OTP
4
GND
Leadtrend Technology Corporation
LD5761-DS-01 May 2015
3
www.leadtrend.com.tw







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