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PDF LD7790 Data sheet ( Hoja de datos )
| Número de pieza | LD7790 | |
| Descripción | Transition-Mode PFC and Quasi-Resonant Current Mode PWM Controller | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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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/
1 page  
Absolute Maximum Ratings
VCC
HV
FBCOMP, PFCCOMP, FBSENSE, PFCSENSE, FBAUX, PFCAUX,
VOSENSE, LATCH, CT, PFCONOFF
FBDRIVER, PFCDRIVER
Power Dissipation, PD@85C
SOP-16
Package Thermal Resistance
SOP-16,JA
Junction Temperature
Lead Temperature (Soldering, 10sec)
Storage Temperature Range
ESD Voltage Protection, Human Body Model, (Pin 3~11 and Pin 14)
ESD Voltage Protection, Human Body Model, (Pin 1, 12, 13)
ESD Voltage Protection, Human Body Model, (Pin 16)
ESD Voltage Protection, Machine Model (except HV Pin)
Gate Output Current
LD7790
9/11/2013
-0.3V~VCC OVP
-0.3V~500V
-0.3V ~6V
-0.3V ~Vcc+0.3V
363mW
110°C/W
125°C
260°C
-55°C to 125°C
3.5KV
2.5KV
1.0KV
250V
+500/-1200mA
Recommended Operating Conditions
Supply Voltage VCC
10V to 29.5V
VCC Capacitor
47 to 100µF
HV Pin Resistor
10~50k
FBCOMP Capacitor Value
1~10nF
Operating Ambient Temperature
-40°C to 85°C
Operating Junction Temperature Range
-40°C to 125°C
Note:
1. It’s essential to connect COMP pin with a capacitor to filter out the undesired switching noise for stable operation.
2. Place the small signal components closed to IC pin as possible.
Caution:
Stress exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stress above Recommended Operating Conditions may affect
device reliability.
Leadtrend Technology Corporation
LD7790-DS-00 September 2013
5
www.leadtrend.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
Typical Performance Characteristics
LD7790
9/11/2013
Leadtrend Technology Corporation
LD7790-DS-00 September 2013
11
www.leadtrend.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet LD7790.PDF ] | |
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