L6668 Smart primary controller
L6668 is a current-mode primary controller IC, designed to build single-ended converters.
The IC drives the system at fixed frequency at heavy load and an improved Standby function causes a smooth frequency reduction as the load is progressively reduced. At very light load the device enters a special operating mode (burst-mode with fixed, externally programmed peak current) that, in addition to the on-board high-voltage start-up and the very low quiescent current, helps keep low the consumption from the mains and be compliant with energy saving regulations. To allow meeting compliance with these standards in power-factor-corrected systems too, an interface with the PFC controller is provided that enables to turn off the pre-regulator when the load level falls below a threshold.
The IC includes also a programmable soft-start, slope compensation for stable operation at duty cycles greater then 50%, a disable function, a leading edge blanking on current sense to improve noise immunity, latched disable for OVP or OTP shutdown and an effective two-level OCP able to protect the system even in case the secondary diode fails short
技术特性
- MULTIPOWER BCD TECHNOLOGY
- LOAD-DEPENDENT CURRENT-MODE CONTROL: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD)
- ON-BOARD HIGH-VOLTAGE START-UP
- IMPROVED STANDBY FUNCTION
- LOW QUIESCENT CURRENT (< 2 mA)
- SLOPE COMPENSATION
- PULSE-BY-PULSE & HICCUP-MODE OCP
- INTERFACE WITH PFC CONTROLLER
- DISABLE FUNCTION (ON/OFF CONTROL)
- LATCHED DISABLE FOR OVP/OTP FUNCTION
- PROGRAMMABLE SOFT-START
- 2% PRECISION REFERENCE VOLTAGE EXTERNALLY AVAILABLE
- ±800 mA TOTEM POLE GATE DRIVER WITH INTERNAL CLAMP AND UVLO PULL-DOWN
- BLUE ANGEL, ENERGY STAR, EU CODE OF CONDUCT COMPLIANT
- SO16 PACKAGE ECOPACK®
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功能框图
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L6668 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| L6668TR |
Active |
|
1000 |
SO-16 |
Tape And Reel |
|
|
| L6668N |
Active |
|
1000 |
PDIP-16 |
Tube |
|
|
| L6668 |
Active |
|
1000 |
SO-16 |
Tube |
|
|
DATASHEET
| 描述 |
版本 |
大小 |
| L6668 : DS4310: Smart primary controller |
4 |
713KB |
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN2600: SMPS for high-end PVR based on L6668 |
1 |
583KB |
| AN2242: Reference design: high performance, L6668-based flyback converter for set-top boxes and PVRs |
1 |
603KB |
| AN2432: EVALSTSR30-60W: 60W AC-DC adapter with synchronous rectification using L6668 and STSR30 |
2 |
644KB |
| AN2521: 19 V - 75 W laptop adapter with tracking boost PFC pre-regulator, using the L6563 and L6668 |
1 |
768KB |
PRODUCT PRESENTATIONS
BOARDS AND TOOLS
| 型号 |
描述 |
| EVAL6668-STB |
Reference design: high performance, L6668-based flyback converter for Set-Top boxes and PVRs |
FLYERS
| 描述 |
版本 |
大小 |
| FLATX0511 : High-efficiency ATX design using asymmetrical half-bridge topology |
1.0.0 |
1148KB |
