L6590 データシートの表示（PDF） - STMicroelectronics

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L6590

FULLY INTEGRATED POWER SUPPLY

STMicroelectronics 

L6590

DESCRIPTION (continued)

The MOSFET is source-grounded, thus it is possible

to build flyback, boost and forward converters.

The device can work with secondary feedback and a

2.5V±2% internal reference, in addition to a high gain

error amplifier, makes possible also the use in appli-

cations either with primary feedback or not isolated.

The internal fixed oscillator frequency and the integrated

non dissipative start-up generator minimize the external

component count and power consumption.

The device is equipped with a standby function that

automatically reduces the oscillator frequency from

65 to 22 kHz under light load conditions to enhance

efficiency (Pin < 1W @ Pout = 0.5W with wide range

mains).

Internal protections like cycle-by-cycle current limiting,

latched output overvoltage protection, mains undervolt-

age protection (SMD version only) and thermal shut-

down generate a 'robust' design solution.

The IC uses a special leadframe with the ground pins

(6, 7 and 8 in minidip, 9 to16 in SO16W package) in-

ternally connected in order for heat to be easily re-

moved from the silicon die. An heatsink can then be

realized by simply making provision of few cm2 of

copper on the PCB. Furthermore, the pin(s) close to

the high-voltage one are not connected to ease com-

pliance with safety distances on the PCB.

BLOCK DIAGRAM

GND

(6,7,8)

PGND

[9, ..., 16]

DRAIN

(1) [1]

[x] : L6590D (SO16W)

START-UP

THERMAL

SHUTDOWN

SUPPLY

& UVLO

VREF

+

-

OVP VREF

+

- OCP

STANDBY

OSC

65/22 kHz

BROWNOUT

+

PWM

-

2.5V

-

+

2.5V

VCC

(3) [4]

SGND

[5]

BOK

[6]

VFB

(5) [8]

COMP

(4) [7]

PIN CONNECTIONS (Top view)

DRAIN

N.C.

Vcc

COMP

MINIDIP

L6590

GND

GND

GND

VFB

DRAIN

N.C.

N.C.

Vcc

SGND

BOK

COMP

VFB

SO16W

L6590D

PGND

PGND

PGND

PGND

PGND

PGND

PGND

PGND

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