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參數(shù)資料
| 型號： | L6590N |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | FULLY INTEGRATED POWER SUPPLY FIPS |
| 中文描述： | 完全集成的電源符合FIPS |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 236K |
| 代理商： | L6590N |
3/19
L6590A
PIN FUNCTIONS
THERMAL DATA
(*) Value depending on PCB copper area and thickness
.
ABSOLUTE MAXIMUM RATINGS
N°
Pin
Description
1
DRAIN
Drain connection of the internal power MOSFET. The internal high voltage start-up generator
sinks current from this pin.
2
N.C.
Not internally connected. Provision for clearance on the PCB.
3
Vcc
Supply pin of the IC. An electrolytic capacitor is connected between this pin and ground. The
internal start-up generator charges the capacitor until the voltage reaches the start-up threshold.
The PWM is stopped if the voltage at the pin exceeds a certain value.
4
COMP
PWM Control Input. The voltage on this pin (V
COMP
) controls the PWM modulator: the higher
V
COMP
, the higher the duty cycle. The pin will be driven by a current sink (usually the transistor of
an optocoupler) able to modulate V
COMP
by modulating the current.
5
BOK
Brownout Protection. If the voltage applied to this pin is lower than 2.5V the PWM is disabled.
This pin is typically used for sensing the input voltage of the converter through a resistor divider.
If not used, the pin can be either left floating or connected to Vcc through a 15 k
resistor.
6 to 8
GND
Connection of both the source of the internal MOSFET and the return of the bias current of the
IC. Pins connected to the metal frame to facilitate heat dissipation.
Symbol
Parameter
Value
Unit
R
thj-amb
Thermal Resistance Junction-ambient (*)
35 to 60
°C/W
R
thj-pins
Thermal Resistance Junction-pins
15
°C/W
Symbol
Parameter
Value
Unit
V
ds
Drain Source Voltage
-0.3 to 700
V
I
d
Drain Current
0.7
A
V
cc
IC Supply Voltage
18
V
I
clamp
V
cc
Zener Current
20
mA
PWM Control Input Sink Current
3
mA
BOK pin Sink Current
1
mA
P
tot
Power Dissipation at T
amb
< 50°C
3 cm
2
, 2 oz copper dissipating area on PCB
1.5
W
T
j
Operating Junction Temperature
-40 to 150
°C
T
stg
Storage Temperature
-40 to 150
°C
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