L6668 STMicroelectronics, L6668 Datasheet - Page 4

• Manufacturer Part Number: L6668
• Description: IC CTRLR PWM PROG CM HV 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6668

• Output Isolation: Isolated
• Frequency Range: 93 ~ 107kHz
• Voltage - Input: 9.4 ~ 22 V
• Power (watts): 750mW
• Operating Temperature: -25°C ~ 150°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Number Of Outputs: 1
• Duty Cycle (max): 75 %
• Output Current: 800 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 105 KHz
• Maximum Operating Temperature: + 150 C
• Fall Time: 30 ns
• Minimum Operating Temperature: - 25 C
• Rise Time: 55 ns
• Synchronous Pin: No
• Topology: Flyback
• Load-dependent Current-mode Control: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD)
• For Use With: 497-6389 - BOARD EVAL USING L6668 & STSR30497-5499 - EVAL BOARD FOR L6668
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6668
Table 5. Electrical Characteristcs
(T
4/23
Table 4. Pin Description (continued)
SUPPLY VOLTAGE
SUPPLY CURRENT
HIGH-VOLTAGE START-UP GENERATOR
V
Number
Symbol
V
I
j
I
I
V
V
I
HV, OFF
CCrestart
HV, ON
= 0 to 105°C, Vcc=15V, Co=1nF; R
start-up
charge
HVstart
V
Pin
Vcc
Hys
I
CCOn
CCOff
I
13
14
15
16
V
qdis
CC
I
HV
q
Z
Operating range
Turn-on threshold
Turn-off threshold
Hysteresis
Zener Voltage
Start-up Current
Quiescent Current
Operating Supply Current
Shutdown quiescent
current
Breakdown voltage
Start voltage
Vcc charge current
ON-state current
Leakage current (OFF state)
HV generator restart voltage
PFC_STOP
Pin Name
S-COMP
STBY
RCT
Parameter
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.
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.
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 V
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%.
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.
T
=13.3k , C
After turn-on
(1)
(1)
Icc = 20 mA
Before turn-on,
Vcc=Vcc
After turn-on
V
V
0.8 <V
I
I
V
V
V
V
(1)
HV
Vcc
DIS
SKIPADJ
HV
HV
HV
HV
After turn-on
After DIS tripping
< 100 µA
< 100 µA
> V
> V
> V
= 400 V
> 2.2, or V
COMP
Hvstart
Hvstart
Hvstart
ON
<0.8
Test Condition
T
-0.5
=1nF; unless otherwise specified)
< V
, Vcc > 3V
, Vcc > 3V
, Vcc = 0
ISEN
SKIPADJ
Function
> 1.5
Min.
12.5
0.55
700
9.4
8.0
4.0
4.4
22
60
12
BE
); when the gate-drive output
Typ.
13.5
0.85
150
180
8.7
1.3
24
80
13
2
1
5
Max.
14.5
105
9.4
2.5
1.8
1.6
0.8
5.6
22
28
40
14
4
1
Unit
mA
mA
mA
mA
mA
mA
µA
µA
µA
V
V
V
V
V
V
V
V
V