开关控制器
Flyback, Forward
2 Output
2000 kHz
企业名:深圳市中立信电子科技有限公司
类型:贸易/代理/分销
电话:
0755-23956688
0755-23956688
手机:13410226883
联系人:叶先生/王先生
邮箱:sales@zlxele.com
地址:广东深圳深圳市福田区彩田路彩虹新都大厦彩荟阁7A室
1 Features
1• 2-MHz High-Frequency Oscillator With 1-MHz
Operation Per Channel
• Matched Internal Slope Compensation Circuits
• Programmable Maximum Duty Cycle Clamp 60%
to 90% Per Channel
• Peak Current Mode Control With Cycle-by-Cycle
Current Limit
• Current Sense Discharge Transistor for Improved
Noise Immunity
• Accurate Line Undervoltage and Overvoltage
Sense With Programmable Hysteresis
• Opto-Coupler Interface
• 110-V Internal Start-Up JFET (UCC28221)
• Operates From 12-V Supply (UCC28220)
• Programmable Soft Start
2 Applications
• High Output Current (50-A to 100-A) Converters
• Maximum Power Density Designs
• High-Efficiency 48-V Input With Low Output Ripple
Converters
• High-Power Offline, Telecom, and Datacom
Power Supplies
3 Description
The UCC28220 and UCC28221 are a family of
BiCMOS interleaved dual channel PWM controllers.
Peak current mode control is used to ensure current
sharing between the two channels. A precise
maximum duty cycle clamp can be set to any value
between 60% and 90% duty cycle per channel.
The UCC28220 has an UVLO turnon threshold of
10 V for use in 12-V supplies while UCC28221 has a
turnon threshold of 13 V for systems needing wider
UVLO hysteresis. Both have 8-V turnoff thresholds.
Additional features include a programmable internal
slope compensation with a special circuit which is
used to ensure exactly the same slope is added to
each channel and a high-voltage 110-V internal JFET
for easier start-up for the wider hysteresis UCC28221
version.
The UCC28220 is available in both 16-pin SOIC and
low-profile TSSOP packages. The UCC28221 also
comes in 16-pin SOIC package and a slightly larger
20-pin TSSOP package to allow for high-voltage pin
spacing to meet UL1950 creepage clearance safety
requirements.
企业名:深圳市中立信电子科技有限公司
类型:贸易/代理/分销
电话:
0755-23956688
0755-23956688
手机:13410226883
联系人:叶先生/王先生
邮箱:sales@zlxele.com
地址:广东深圳深圳市福田区彩田路彩虹新都大厦彩荟阁7A室