|
|
PDF LD7535B Data sheet ( Hoja de datos )
| Número de pieza | LD7535B | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Leadtrend Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LD7535B (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
|
No Preview Available !
LD7535B
3/10/2008
Green-Mode PWM Controller with Integrated Protections
Rev.01a
General Description
The LD7535B is a low cost, low startup current, current
mode PWM controller with green-mode power-saving
operation. The integrated functions include the
leading-edge blanking of the current sensing, internal slope
compensation and the tiny package of SOT-26. It would
provide the users a superior AC/DC power application of
higher efficiency, low external component counts, and lower
cost solution for applications.
In comparing with the previous generations like LD755X, the
LD7535B features more protections or functions for the
following characteristics ---
z Add OLP (Over Load Protection) function to provide
better protection performance for fault conditions like
short circuit or over load.
z Modify the OVP (Over Voltage Protection) mechanism
from the cycle-by-cycle mode to the hiccup mode.
Features
z High-Voltage CMOS Process with Excellent ESD
protection
z Very Low Startup Current (<20μA)
z Current Mode Control
z Non-audible-noise Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Programmable Switching Frequency
z Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z OLP (Over Load Protection)
z 300mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
Typical Application
Leadtrend Technology Corporation
LD7535B-DS-01a March 2008
1
www.leadtrend.com.tw
1 page  
LD7535B
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
Supply Voltage (Vcc Pin)
Startup Current
Operating Current
(with 1nF load on OUT pin)
VCOMP=0V
VCOMP=3V
Protection tripped (OLP, OVP)
UVLO (off)
UVLO (on)
OVP Level
Voltage Feedback (Comp Pin)
Short Circuit Current
Open Loop Voltage
VCOMP=0V
COMP pin open
Green Mode Threshold VCOMP
Current Sensing (CS Pin)
Maximum Input Voltage, Vcs(off)
Leading Edge Blanking Time
Input impedance
Delay to Output
Oscillator (RT pin)
Frequency
RT=100KΩ
Green Mode Frequency
Fs=65KHz
Temp. Stability
(-40°C ~105°C)
Voltage Stability
(VCC=11V-25V)
Gate Drive Output (OUT Pin)
Output Low Level
VCC=15V, Io=20mA
Output High Level
VCC=15V, Io=20mA
Rising Time
Load Capacitance=1000pF
Falling Time
Load Capacitance=1000pF
OLP (Over Load Protection)
OLP Trip Level
Vcomp(OLP)
OLP Delay Time (note)
Fs=65KHz
MIN
TYP
MAX UNITS
8 20 μA
2.0 3.0 mA
2.5 mA
0.5 mA
9.0
10.0
11.0
V
15.0
16.0
17.0
V
26.5
28.0
29.5
V
1.5
6.0
2.35
2.2 mA
V
V
0.80
1
0.85
200
100
0.90 V
nS
MΩ
nS
60 65 70 KHz
20 KHz
3%
1%
1V
8V
250 nS
100 nS
5.0 V
60 mS
Note: The OLP delay time is proportional to the period of switching cycle. So that, the lower RT value will set the higher switching
frequency and the shorter OLP delay time.
Leadtrend Technology Corporation
LD7535B-DS-01a March 2008
5
www.leadtrend.com.tw
5 Page 
LD7535B
listed below, the gate output will turn off immediately to
protect the power circuit ---
y RT pin short to ground
y RT pin floating
y CS pin floating
Fig.19
Fault Protection
There are several critical protections were integrated in the
LD7535B to prevent the power supply or adapter from being
damaged. Those damages usually come from open or short
condition on the pins of LD7535B. Under the conditions
Leadtrend Technology Corporation
LD7535B-DS-01a March 2008
11
www.leadtrend.com.tw
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet LD7535B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LD7535 | Green-Mode PWM Controller | Leadtrend Technology |
| LD7535A | Green-Mode PWM Controller | Leadtrend Technology |
| LD7535B | Green-Mode PWM Controller | Leadtrend Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |