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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/23頁 |
| 文件大小： | 720K |
| 代理商： | L6668TR |
L6668
4/23
13
STBY
Standby function. This pin is a high-impedance one as long as the voltage on pin COMP is
higher than 3V. When the voltage on pin COMP falls below 3V, the voltage on the pin tracks
that on pin COMP and is capable of sinking current. A resistor connected from the pin to the
oscillator allows programming frequency foldback at light load.
14
PFC_STOP
Open-drain ON/OFF control of PFC controller. This pin is intended for driving the base of a
PNP transistor in systems comprising a PFC pre-regulator, to stop the PFC controller at
light load by cutting its supply. The pin, normally low, opens if the voltage on COMP is lower
than 2.2V and goes back low when the voltage on pin COMP exceeds 2.7V. Whenever the
IC is shutdown, either latched (DIS >2.2V, ISEN >1.5V) or not (UVLO, SKIPADJ<0.8), the
pin is open as well.
15
S-COMP
Voltage ramp for slope compensation. When the gate-drive output is high the pin delivers a
voltage tracking the oscillator ramp (shifted down by one VBE); when the gate-drive output
is low the voltage delivered is zero. The pin is to be connected to pin ISEN via a resistor to
make slope compensation and allow stable operation at duty cycles close to and greater
than 50%.
16
RCT
Oscillator pin. A resistor to VREF and a capacitor to GND define the oscillator frequency (at
full load). A resistor connect to STBY modifies the oscillator frequency when the voltage on
pin COMP is lower than 3V.
Table 5. Electrical Characteristcs
(Tj = 0 to 105°C, Vcc=15V, Co=1nF; RT =13.3k , CT =1nF; unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY VOLTAGE
Vcc
Operating range
After turn-on
9.4
22
V
VCCOn
Turn-on threshold
(1)
12.5
13.5
14.5
V
VCCOff
Turn-off threshold
(1) After turn-on
8.0
8.7
9.4
V
Hys
Hysteresis
4.0
V
VZ
Zener Voltage
Icc = 20 mA
22
24
28
V
SUPPLY CURRENT
Istart-up
Start-up Current
Before turn-on,
Vcc=VccON-0.5
150
A
Iq
Quiescent Current
After turn-on
2
2.5
mA
ICC
Operating Supply Current
4
mA
Iqdis
Shutdown quiescent
current
VDIS > 2.2, or VISEN > 1.5
180
A
VSKIPADJ<0.8
1
1.8
mA
0.8 <VCOMP < VSKIPADJ
1.3
mA
HIGH-VOLTAGE START-UP GENERATOR
VHV
Breakdown voltage
IHV < 100 A
700
V
VHVstart
Start voltage
IVcc < 100 A
60
80
105
V
Icharge
Vcc charge current
VHV > VHvstart, Vcc > 3V
0.55
0.85
1
mA
IHV, ON
ON-state current
VHV > VHvstart, Vcc > 3V
1.6
mA
VHV > VHvstart, Vcc = 0
0.8
IHV, OFF
Leakage current (OFF state)
VHV = 400 V
40
A
VCCrestart
HV generator restart voltage
4.4
5
5.6
V
(1) After DIS tripping
12
13
14
V
Table 4. Pin Description (continued)
Pin
Number
Pin Name
Function
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