L9341 datasheet(3/10 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISTICS (Unless otherwise specified: 8V

≤ VS ≤ 24V; 4.7V ≤ VCC ≤ 5.3V; –

°C ≤ Tj ≤ 150°C; IO ≤ 1A (note 3); IO ≤ 1.5A; Vsp =VS for t ≤ 400ms; VOUTP =VOUT for t ≤ 400ms;

Rext = 12.4K

Ω ± 1%).

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Iccq

Vcc Quiescent Current

All Outputs Off

Isq

Vs Quiescent Current

All Outputs Off

Vccu

Vcc Undervoltage Threshold

See Note 4

4.7

Vccr

Vcc Range for RES1 and RES2

Operation

Ron

On Resistance

Io =1A

Tj = 125

°C

Tj =25

°C

750

450

Ω

Io off

Off State Output Current

Outputs Off

1.4V

≤ Vo ≤ Vs

Voutp =Vsp = 40V

2.5

Voutf

Output Voltage During Flyback

Io = 1A Output Off

Tj =25

°C

Tj = 125

°C

Vs +1.3

Vs +1.1

Igndf

Current to GND during Flyback

(see note 5)

Io = 1A Output Off

Vs = 24V

Vsp = 40V

Ioutr

Reverse Leakage Current

Vsp -Vo = 40V

500

µA

VinH

High Input Level of SCLK,

SDI, CS, RES1, RES2

0.7*Vcc

Vcc+0.3

VinL

Low Input Level of SCLK,

SDI, CS, RES1, RES2

– 0.3

0.3*Vcc

VREShys

Hysteresis of Reset Inputs

RES1, RES2

0.3

IinRESH

Input Current on RES1,RES2

RESi = H; -2V

≤ Vsp ≤ 8V

RESi =H; 8V

≤ Vsp ≤ 40V

–10

µA

Iin

Input Current on SCLK,SDI,CS

– 2V

≤ Vsp ≤ 40V

– 10

µA

VSDOH

High Level SDO Output Voltage

ISDO = -1mA -2V

≤ Vsp ≤ 40V

0.9*Vcc

Vcc

VSDOL

Low Level SDO Output Voltage

ISDO = 1mA -2V

≤ Vsp ≤ 40V

0.4

ISDOZ

SDO Tristate High-Z Leakage

Current

≤ VSDO ≤ Vcc

–2V

≤ Vsp ≤ 40V

–10

µA

PWMduty

PWM Duty Cycle

1/16

15/16

Frequency Accuracy Constant

See Note 6

0.93*Kfn

Kfn

1.07*Kfn

Vflyth

Flyback Diagnostic Comparator

Threshold

≥ Vsp ≥ 8V

≤ 8V

Vs –1

1.5

Vs – 0.4

Voffth

Off State Diagnostic

Comparator Threshold

1.5

Ioutl

Output Current Limitation Threshold

see Note 7

1.5

2.5

tdpo

Delay Time PWM Signal to Out.

µs

Sov

Output Voltage Rise and Fall

Slope | du/dt |

(from 10 to 90% of Vo) Fig. 2

1.0

µs

Soc

Output Current Rise and Fall

Slope |di/dt|

0.1

≤ Io ≤ 1.5A

(from 10 to 90% of Io)

125

mA/

µs

Notes:

3. The mean value is Io =

T ∫

(t) dt

;

4. The outputs are switced off for Vcc

≤ Vccu. The logic is not reseted. For a reset, RES1 or RES2 must be used.

5. This current is measured in the GND - terminal when one single output is in flyback and consists of the supply current added to the value

of the output current source and the leakage current of the flyback diode. This leakage current is less than 1% of the nominal flyback current.

6. The PWM frequency is defined by an external capacitor. The PWM oscillator frequency is: fpwm =

fosc

with fosc =

Cosc

⋅ 1A/V and kin =15 ⋅ 10-6;

the range is: 300Hz

≤ fpwm ≤ 3000Hz. The OSC Pin can be alternatively driven by an external TTL / CMOS signal.

7. For Iout

≥ Ioutl an internal comparator switches the corresponding output off for the current PWM cycle.

L9341

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