Features: • Startup Circuit Eliminates the Need for Transformer Auxiliary Bias Winding
• Optional Auxiliary Bias Winding Override for Lowest Standby Power Applications
• Converter Output Overload and Open Loop Protection
• Auto Restart Fault Protection
• IC Thermal Fault Protection
• Unique, Dual Edge, Gated Oscillator Configuration for Extremely Fast Loop Response
• Oscillator Frequency Dithering with Controlled Slew Rate Driver for Reduced EMI
• Low Power Consumption Allowing European Blue Angel Compliance
• OnChip 700 V Power Switch Circuit and Active Startup Circuit
• Rectified AC Line Source Operation from 85 V to 265 V
• Input Undervoltage Lockout with Hysteresis
• Oscillator Frequency Options of 44 kHz, 100 kHz, 136 kHz
Application• ACDC Converters
• Wall Adapters
• Portable Electronic Chargers
• Low Power Standby and KeepAlive Supplies
Specifications
|
Rating |
Symbol |
Value |
Unit |
Power Switch and Startup Circuit
Drain Voltage Range
Drain Current Peak During Transformer Saturation |
VDS
IDS(pk) |
- 0.3 to 700
2.0 Ilim Max |
V
A |
Power Supply/VCC Bypass and Control Input
Voltage Range
Current |
VIR
Imax |
-0.3 to 10
100 |
V
mA |
Thermal Characteristics
P Suffix, Plastic Package Case 626
Junction to Lead
Junction to Air, 2.0 Oz. Printed Circuit Copper Clad
0.36 Sq. Inch
1.0 Sq. Inch |
RJC
RJA |
2.0
45
35 |
/W |
| Operating Junction Temperature |
TJ |
- 40 to +150 |
|
| Storage Temperature |
Tstg |
- 65 to +150 |
|
1. Maximum Ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute maximumrated conditions is not implied. Functional operation should be restricted to the Recommended Operating Conditions.
A. This device series contains ESD protection and exceeds the following tests:
Pins 13: Human Body Model 2000 V per MILSTD883, Method 3015.Machine Model Method 400 V.
Pin 5: Human Body Model 1000 V per MILSTD883, Method 3015.Machine Model Method 400 V.
Pin 5 is connected to the power switch and startup circuits, and is rated only to the max voltage of the part, or 700 V.
B. This device contains Latchup protection and exceeds ± 100 mA per JEDEC Standard JESD78.
DescriptionThe NCP1050 through NCP1055 are monolithic high voltage regulators that enable end product equipment to be compliant with low standby power requirements. This device series combines the required converter functions allowing a simple and economical power system solution for office automation, consumer, and industrial products.
NCP1050 are designed to operate directly from a rectified AC line source. In flyback converter applications they are capable of providing an output power that ranges from 6.0 W to 40 W with a fixed AC input of 100 V, 115 V, or 230 V, and 3.0 W to 20 W with a variable AC input that ranges from 85 V to 265 V.
NCP1050 features an active startup regulator circuit that eliminates the need for an auxiliary bias winding on the converter transformer, fault logic with a programmable timer for converter overload protection, unique gated oscillator configuration for extremely fast loop response with double pulse suppression, power switch current limiting, input undervoltage lockout with hysteresis, thermal shutdown, and auto restart fault detection. These devices are available in an economical 8pin dualinline package.
23877 Data Sheet
