參數(shù)資料
型號(hào)： L6668TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING CONTROLLER, 105 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, SOP-16
文件頁(yè)數(shù)： 12/23頁(yè)
文件大小： 720K
代理商： L6668TR
L6668
2/23
2
Description
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 en-
ables 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.
Table 2. Absolute Maximum Ratings 1
Note:
1. ESD immunity for pin 1 is guaranteed up to 900V (Human Body Model).
Table 3. Thermal Data
Figure 3. Pin Connection (Top view)
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
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal Resistance Junction to AmbientMax
120
°C/W
VREF
SKIPADJ
HV
HVS
GND
OUT
Vcc
N.C.
DIS
RCT
S-COMP
PFC_STOP
STBY
ISEN
SS
COMP
VREF
SKIPADJ
HV
HVS
GND
OUT
Vcc
N.C.
DIS
RCT
S-COMP
PFC_STOP
STBY
ISEN
SS
COMP
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