L6605D datasheet(3/10 Pages) STMICROELECTRONICS

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CIRCUIT OPERATION

CARD POWER SUPPLY

Regulated voltage to supply the card (5V/80mA).

During nominal condition (VS = 12V, ICS = 80mA)

the VCS range variation is equal to + 3%.

While during line/load variation (VS = 10V to 15V;

ICS = 1mA to 80mA) the VCS range is + 5%.

An internal circuitry checks the ICS level; the pro-

tection block activates an IRQ with the proper fail-

ure code when the output current is in 81mA to

200mA range.

PROGRAMMING POWER SUPPLY

L6605 works in step-down mode by means of the

programmed output voltage VPP.8VPP levels can

be selected programming the 3 bit DAC as per

Table 1. During nominal conditions (IPP = 50mA;

VPPI = 30V) the VPP range variation is equal to

ELECTRICAL CHARACTERISTICS (VS = 12V; Tj =25

°C)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Supply Voltage

VCS

Card Supply Voltage

(Logic Inputs onset)

ICS = 80mA, VS = 12V

ICS = 1mA to 80mA

VS = 10V to 15V

CLOADmin = 5nF; CLOADmax =20

µF

4.85

4.75

5.15

5.25

ICS

Current Supply Card

ICSS

ICS Short Circuit

VS = 12V

200

VPPI

VPP Supply Voltage

VPPO +

2.5V

VPPO

Programming Voltage

IPP = 50mA; VPPI = 30V;

Ton <5ms

IPP = 1mA to 50mA

VPPI = max. 33V (see note 1)

CLOAD min = 5nF

CLOAD max = 500nF (see note 2)

-2.5%

-5%

VDAC

+2.5%

+5%

IPP

Output Program. Current

VPPI = 30V

IPPs

IPP Short Circuit

150

ton

VPP, Rise Time

CLOAD min = 5nF

CLOAD max = 500nF (see note 2)

IL = 50mA (see note 1)

200

µs

toff

VPP, Fall Time

200

µs

tshadow

Shadow Timing

Cbounce = 0.1

µF1

VSWLOW

Low Level Switch Input

0.8

VSWHIGH

High Level Switch Input

Vs-2V

tCKON

Clock ON Time

CLOAD = 50pF, ISINK = 4mA,

VL = 0.4V

µs

tCKOFF

Clock OFF Time

µs

Delay Time

250

tSET-UP1

1st bit Set-up Time

500

tHOLD1

1st bit Hold Time

500

tCKON

tSET-UP2

Data Set-up Time

500

tHOLD2

Data Hold Time

500

tSCK

Clock Set-up Time

250

tHCK

Clock Hold Time

250

Clock Frequency

500

KHz

VPP Slew Rate

From rest state to

programming state and

viceversa

2V/

µs

VSTH

Power ON/OFF Threshold

Logic inputs onset

8.5

9.5

VSHY

VSTH Hysteresis

0.6

Thermal Shutdown

180

°C

Thermal Hysteresis

°C

Note 1: True for values in Tab. 1 only. ;

Note 2: Values higher than 500nF are permitted, but the ton, toff timing will be out ISO norm.

L6605

3/10

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