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LD7577 데이터시트 PDF




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부품번호 LD7577 기능
기능 High Voltage Green-Mode PWM Controller
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LD7577 데이터시트, 핀배열, 회로
LD7577
1/15/2009
High Voltage Green-Mode PWM Controller with
Brown-Out Protection
Rev. 01
General Description
The LD7577 integrates several functions of protections, and
EMI-improved solution in SOP-8 package. It minimizes the
component counts and the circuit space.
The device provides functions of low startup current,
green-mode power-saving operation, leading-edge blanking
of the current sensing and internal slope compensation.
Also, it features more protections like OLP (Over Load
Protection), OVP (Over Voltage Protection), and brownout
protection to prevent the circuit from being damaged under
abnormal conditions.
Features
z High-Voltage (500V) Startup Circuit
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 Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z AC Input OVP (Over Voltage Protection)
z OLP (Over Load Protection)
z Precision Brownout Protection
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
AC EMI
input Filter
*
HV VCC OUT
BNO
LD7577
CS
GND COMP
*
*See Application Information
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
1
www.leadtrend.com.tw
photocoupler
TL431




LD7577 pdf, 반도체, 판매, 대치품
LD7577
Absolute Maximum Ratings
Supply Voltage VCC
High-Voltage Pin, HV
COMP, BNO, CS
Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Package Thermal Resistance (SOP-8)
Package Thermal Resistance (DIP-8)
Power Dissipation (SOP-8, at Ambient Temperature = 85°C)
Power Dissipation (DIP-8, at Ambient Temperature = 85°C)
Lead temperature (Soldering, 10sec)
ESD Voltage Protection, Human Body Model (except HV Pin)
ESD Voltage Protection, Machine Model (except HV Pin)
Gate Output Current
30V
-0.3V~500V
-0.3 ~7V
150°C
-20°C to 85°C
-65°C to 150°C
160°C/W
100°C/W
400mW
650mW
260°C
2.5KV
250V
500mA
Caution:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not
implied.
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
4
www.leadtrend.com.tw

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LD7577 전자부품, 판매, 대치품
Typical Performance Characteristics
LD7577
1.5
1.3
1.1
0.9
0.7
-40
0 40 80
Temperature (°C)
120 125
Fig. 1 HV Current Source vs. Temperature (HV=500V, Vcc=0V)
18.0
17.2
16.4
15.6
14.8
14.0
-40
0 40 80
Temperature (°C)
Fig. 3 UVLO (on) vs. Temperature
120 125
68
66
64
62
60
58
57
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Fig. 5 TC of Switching Frequency
0.90
0.89
0.88
0.87
0.86
0.85 -40
12
11.2
0 40 80
Temperature (°C)
Fig. 2 VCS (off) vs. Temperature
120 125
10.4
9.6
8.8
8
-40
23
22
21
20
19
18
0 40 80
Temperature (°C)
Fig. 4 UVLO (off ) vs. Temperature
120 125
17
-40
-20 0 20 40 60 80 100
Temperature (°C)
Fig. 6 TC of Green Mode frequency
120
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
7
www.leadtrend.com.tw

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