L6590 データシートの表示（PDF） - STMicroelectronics
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L6590 Datasheet PDF : 23 Pages
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L6590
PIN FUNCTIONS
Pin#
Name
L6590 L6590D
Description
1
1
DRAIN Drain connection of the internal power MOSFET. The internal high voltage start-up
generator sinks current from this pin.
2
2, 3
N.C. Not internally connected. Provision for clearance on the PCB.
3
4
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
7
COMP Output of the Error Amplifier. Used for control loop compensation or to directly control
PWM with an optocoupler.
5
8
VFB Inverting input of the Error Amplifier. The non-inverting one is internally connected to a
2.5V± 2% reference. This pin can be grounded in some feedback schemes.
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.
-
6
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 kΩ resistor.
-
5
SGND Current return for the bias current of the IC.
-
9 to 16 PGND Connection of the source of the internal MOSFET. Pins connected to the metal frame to
facilitate heat dissipation.
THERMAL DATA
Symbol
Parameter
Rthj-amb Thermal Resistance Junction to ambient (*)
Rthj-pins Thermal Resistance Junction to pins
(*) Value depending on PCB copper area and thickness.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Vds
Drain Source Voltage
Id
Drain Current
Vcc
IC Supply Voltage
Iclamp Vcc Zener Current
Error Amplifier Ouput Sink Current
Voltage on Feedback Input
BOK pin Sink Current
Ptot
Power Dissipation at Tamb < 50°C (Minidip and SO16W)
3 cm2, 2 oz copper dissipating area on PCB
Tj
Operating Junction Temperature
Tstg
Storage Temperature
Minidip
35 to 60
15
SO16W
40 to 65
20
Unit
°C/W
°C/W
Value
-0.3 to 700
0.7
18
20
3
5
1
1.5
-40 to 150
-40 to 150
Unit
V
A
V
mA
mA
V
mA
W
°C
°C
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