l6590a STMicroelectronics, l6590a Datasheet - Page 3

• Manufacturer Part Number: l6590a
• Description: Fully Integrated Power Supply
• Manufacturer: STMicroelectronics

PIN FUNCTIONS
THERMAL DATA
(*) Value depending on PCB copper area and thickness
ABSOLUTE MAXIMUM RATINGS
6 to 8
Symbol
Symbol
R
R
N°
I
thj-amb
1
2
3
4
5
thj-pins
clamp
T
V
P
V
T
I
stg
ds
d
cc
tot
j
DRAIN
COMP
GND
BOK
N.C.
Vcc
Pin
Thermal Resistance Junction-ambient (*)
Thermal Resistance Junction-pins
Drain Source Voltage
Drain Current
IC Supply Voltage
V
PWM Control Input Sink Current
BOK pin Sink Current
Power Dissipation at T
3 cm
Operating Junction Temperature
Storage Temperature
cc
Zener Current
2
, 2 oz copper dissipating area on PCB
Drain connection of the internal power MOSFET. The internal high voltage start-up generator
sinks current from this pin.
Not internally connected. Provision for clearance on the PCB.
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.
PWM Control Input. The voltage on this pin (V
V
an optocoupler) able to modulate V
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.
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.
COMP
, the higher the duty cycle. The pin will be driven by a current sink (usually the transistor of
amb
< 50°C
Parameter
Parameter
.
COMP
by modulating the current.
Description
COMP
) controls the PWM modulator: the higher
-0.3 to 700
-40 to 150
-40 to 150
35 to 60
Value
Value
0.7
1.5
15
18
20
3
1
L6590A
°C/W
°C/W
Unit
Unit
mA
mA
mA
°C
°C
W
V
A
V
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