L6590A データシートの表示（PDF） - STMicroelectronics
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L6590A Datasheet PDF : 19 Pages
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L6590A
PIN FUNCTIONS
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 (VCOMP) controls the PWM modulator: the higher
VCOMP, the higher the duty cycle. The pin will be driven by a current sink (usually the transistor of
an optocoupler) able to modulate VCOMP 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 kΩ 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.
THERMAL DATA
Symbol
Parameter
Rthj-amb Thermal Resistance Junction-ambient (*)
Rthj-pins Thermal Resistance Junction-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
PWM Control Input Sink Current
BOK pin Sink Current
Ptot
Power Dissipation at Tamb < 50°C
3 cm2, 2 oz copper dissipating area on PCB
Tj
Operating Junction Temperature
Tstg
Storage Temperature
Value
35 to 60
15
Unit
°C/W
°C/W
Value
-0.3 to 700
0.7
18
20
3
1
1.5
-40 to 150
-40 to 150
Unit
V
A
V
mA
mA
mA
W
°C
°C
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