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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.Key Features
- LATCHED DISABLE FOR OVP/OTP FUNCTION
- DISABLE FUNCTION (ON/OFF CONTROL)
- 2% PRECISION REFERENCE VOLTAGE EXTERNALLY AVAILABLE
- PROGRAMMABLE SOFT-START
- BLUE ANGEL, ENERGY STAR, EU CODE OF CONDUCT COMPLIANT
- ±800 mA TOTEM POLE GATE DRIVER WITH INTERNAL CLAMP AND UVLO PULL-DOWN
- SO16 PACKAGE ECOPACK®
- PULSE-BY-PULSE & HICCUP-MODE OCP
- SLOPE COMPENSATION
- MULTIPOWER BCD TECHNOLOGY
- ON-BOARD HIGH-VOLTAGE START-UP
- LOAD-DEPENDENT CURRENT-MODE CONTROL: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD)
- LOW QUIESCENT CURRENT (< 2 mA)
- INTERFACE WITH PFC CONTROLLER
- IMPROVED STANDBY FUNCTION
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All resources
Product Specifications (1)
| Resource title | Latest update | |||
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| 19 Sep 2016 |
19 Sep 2016
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Application Notes (3)
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| 13 Sep 2018 |
13 Sep 2018
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| 13 Sep 2018 |
13 Sep 2018
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Design Notes & Tips (1)
| Resource title | Latest update | |||
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| 25 Jul 2018 |
25 Jul 2018
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Presentations (1)
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| 21 Jun 2018 |
21 Jun 2018
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Brochures (2)
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| 23 Mar 2020 |
23 Mar 2020
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| 29 Jul 2020 |
29 Jul 2020
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EDA Symbols, Footprints and 3D Models
STMicroelectronics - L6668
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L6668 |
Active
|
SO-16 | Industrial | Ecopack2 |
|
| L6668TR |
Active
|
SO-16 | Industrial | Ecopack2 |
|
L6668
Package:
SO-16Material Declaration**:
L6668TR
Package:
SO-16Material Declaration**:
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L6668 | 1 distributors |
Active
|
EAR99 | NEC | Tube | SO-16 | - | - | PHILIPPINES | 0.8544 / 1k | ||
| L6668TR | 1 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SO-16 | - | - | PHILIPPINES | 0.8544 / 1k | |
Marketing Status
ActiveECCN (US)
EAR99Budgetary Price (US$)*/Qty
0.8544 / 1k(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
