Operating Supply Voltage
:
Operating Supply Current
:
Number of Outputs
: 1
Mounting Style
: SMD/SMT
Maximum Operating Temperature
: + 150 C
Fall Time
: 30 ns
Duty Cycle (Max)
: 75 %
Switching Frequency
: 105 KHz
Rise Time
: 55 ns
Package / Case
: SO-16 N
Features: · 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
Application· HI-END AC-DC ADAPTERS/CHARGERS FOR NOTEBOOKS.
· LCD/CRT MONITORS, LCD/CRT TV
· DIGITAL CONSUMERPinout
Specifications
| Symbol |
Pin |
Parameter |
Value |
Unit |
| Vcc |
5 |
IC Supply voltage (Icc = 20 mA) |
Self-limited |
V |
| VHV |
1 |
High-voltage start-up generator voltage range |
-0.3 to 700 |
V |
| IHV |
1 |
High-voltage start-up generator current |
Self-limited |
A |
| --- |
|
Analog Inputs & Outputs, except pin 14 |
-0.3 to 8 |
V |
| IPFC_STOP |
14 |
Max. sink current (low state) |
2 |
mA |
| VPFC_STOP |
14 |
Max. voltage (open state) |
16 |
V |
| Ptot |
|
Power Dissipation @Tamb = 50°C |
0.75 |
W |
| Tj |
|
Junction Temperature Operating range |
-25 to 150 |
°C |
| Tstg |
|
Storage Temperature |
-55 to 150 |
°C |
DescriptionL6668 is a current-mode primary controller IC, designed to build single-ended converters.
The L6668 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 L6668 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 L6668 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, ltched 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.
Parameters: | Technical/Catalog Information | L6668 |
| Vendor | STMicroelectronics |
| Category | Integrated Circuits (ICs) |
| Packaging | * |
| Package / Case | * |
| Power (Watts) | 750mW |
| Voltage - Input | 9.4 ~ 22 V |
| Voltage - Output | - |
| Frequency Range | 93 ~ 107kHz |
| Operating Temperature | -25°C ~ 150°C |
| Output Isolation | Isolated |
| Drawing Number | * |
| Lead Free Status | Lead Free |
| RoHS Status | RoHS Compliant |
| Other Names | L6668
L6668
|
L6668 Data Sheet
