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LD7790 PDF даташит

Спецификация LD7790 изготовлена ​​​​«Leadtrend» и имеет функцию, называемую «Transition-Mode PFC and Quasi-Resonant Current Mode PWM Controller».

Детали детали

Номер произв LD7790
Описание Transition-Mode PFC and Quasi-Resonant Current Mode PWM Controller
Производители Leadtrend
логотип Leadtrend логотип 

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LD7790 Даташит, Описание, Даташиты
LD7790
9/11/2013
Transition-Mode PFC and Quasi-Resonant
Current Mode PWM Controller
REV: 00
General Description
The LD7790 features transition mode Power Factor
correction (PFC) controller and Quasi-Resonant (QR)
current mode controller for cost effective and fewer
external components design of high power application.
The intelligent PFC switching ON/OFF, zero current
detection (ZCD) and frequency limitation mechanism
enable a better efficiency under any load conditions.
The device is also integrated several functions of
protection, such as X-CAP discharge, Brown-in/out
protection, Over Load protection (OLP), Over
Temperature Protection (OTP), Over Voltage Protection
(OVP) and Over Current Protection (OCP) with High / Low
Line Compensation. Therefore it can protect the system
from damage due to occasional failure.
The LD7790 is available in a SOP-16 package.
Features
Integrated PFC and QR Flyback Controller
Transition Mode PFC Controller
Quasi-Resonant Operation for Flyback
Built-in X-CAP Discharging
Brown IN/OUT Protection
Internal Soft-Start Function
Adjustment OLP Debounce time
External Latch Protection
PFC Light Load Turn-off Control
OVP (Over Voltage Protection)
OCP (Cycle by cycle current limiting)
500/-1200mA Driving Capability
Internal OTP function
Applications
AC-DC High Power Adapter
Open Frame SMP
Leadtrend Technology Corporation
LD7790-DS-00 September. 2013
1
www.leadtrend.com.tw
Free Datasheet http://www.datasheet4u.com/









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LD7790 Даташит, Описание, Даташиты
Typical Application
AC EMI
Input Filter
LD7790
9/11/2013
8 12
PFCAUX PFCDRIVER
16 HV
11 9
PFCSENSE VOSENSE
FBDRIVER 13
7 PFC ON/OFF
6 PFCCOMP
LD7790 FBSENSE 10
1 VCC
FBCOMP 3
4 FBAUX
GND
2
CT
14
LATCH 5
photocoupler
Pin Configuration
SOP-16 (TOP VIEW)
16 15 14 13 12
11 10
9
TOP MARK
YYWWPP
1 2345 678
YYYear code (D2004, E2005...)
WWWeek code
PPProduction code
Ordering Information
Part number
Package
Top Mark
Shipping
LD7790 GS
SOP-16
LD7790 GS
2500 /tape & reel
The LD7790 is ROHS compliant/ green packaged.
Protection Mode
Part number
OVP
(VCC & FBAUX)
OLP
External Latch
Internal OTP
LD7790 GS
Auto recovery
Auto recovery
Latch
Auto recovery
Leadtrend Technology Corporation
LD7790-DS-00 September 2013
2
www.leadtrend.com.tw
Free Datasheet http://www.datasheet4u.com/









No Preview Available !

LD7790 Даташит, Описание, Даташиты
Pin Descriptions
VCC
GND
FBCOMP
FBAUX
LATCH
PFCCOMP
PFCONOFF
PFCAUX
HV
NC
CT
FBDRIVER
PFCDRIVER
PFCSENSE
FBSENSE
VOSENSE
LD7790
9/11/2013
Pin NAME
FUNCTION
1 VCC
Supply voltage pin.
2 GND
Ground.
Voltage feedback pin for flyback stage. Connect a photo-coupler to close the
3 FBCOMP
control loop and achieve the regulation.
4 FBAUX
Zero current detection and over voltage protection for flyback stage.
5 LATCH
External latch protection pin.
6 PFCCOMP Output of the error amplifier for PFC voltage loop compensation.
7 PFCONOFF Threshold voltage setting of FBCOMP for PFC ON/OFF loading control.
8 PFCAUX
Zero current detection for PFC stage.
9 VOSENSE Voltage sense for PFC output, regulation voltage is 2.5V.
10 FBSENSE Current sense pin. Connect it to sense the Flyback MOSFET current.
11 PFCSENSE Current sense pin. Connect it to sense the PFC MOSFET current.
12 PFCDRIVER Gate drive output to drive the external MOSFET for PFC.
13 FBDRIVER Gate drive output to drive the external MOSFET for Flyback.
14 CT
Timer setting for Open Loop Protection, PFC light-load turn-off and flyback
soft-start.
15 NC
Unconnected Pin.
Connect this pin to Line/Neutral of AC main voltage through a resistor to provide
the startup current for the controller. When VCC voltage increases to trip the point
of UVLO(on), this HV loop will be turned off to reduce the power loss over the
16 HV
startup circuit.
HV pin Internal circuit will detect the AC peak voltage, providing Brown in/out and
High / Low Line Detection function.
HV pin internal circuit will discharge X-cap’s energy through HV current source
when AC line is disconnected.
Leadtrend Technology Corporation
LD7790-DS-00 September 2013
3
www.leadtrend.com.tw
Free Datasheet http://www.datasheet4u.com/










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