LED7706 datasheet(10/31 Pages) STMICROELECTRONICS

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Electrical characteristics

LED7706

10/31

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

OC and OV protections

VTH,OVP

Over voltage protection

reference threshold (OVSEL)

1.190

1.234

1.280

VTH,FRD

Floating channel detection

threshold

1.100

1.145

1.190

∆V

OVP,FRD

Voltage gap between OVP and

FRD thresholds

Soft-start and power management

EN, Turn-On level threshold

1.4

1.6

EN, Turn-off level threshold

0.8

1.0

DIM, high level threshold

1.15

1.3

DIM, low level threshold

0.8

1.09

EN, pull-up current

2.5

µA

SS, charge current

SS, end-of-startup threshold

2.0

2.4

2.8

SS, reduced switching

frequency release threshold

0.8

Current generators section

TDIM-

ON,min

Minimum dimming on-time

RRILIM = 51 kΩ

KR = 987

Irowx,nom = KR/RRILIM

500

ƒIrowx,1

rows current accuracy (1)

±2.0

ƒIrowx,2

rows current mismatch(2)

+4.0

VIFB

Feedback regulation voltage

400

Vrowx,

FAULT

Shorted LED fault detection

threshold

MODE tied to SGND

3.4

MODE connected to AVCC

6.0

TMASK

LED short circuit detection

masking time

100

µs

VFAULT,

LOW

FAULT pin Low-Level voltage

IFAULT,SINK = 4 mA

200

350

Thermal shutdown

TSHDN

Thermal shutdown

turn-off temperature

150

°C

Thermal shutdown hysteresis

Current accuracy calculated as

∆I

rowx,1 = (Irowx-Irowx,NOM) / Irowx,NOM

Current Mismatch calculated as

∆Irowx,2 = |Irowx-Irowy| / Irowx,NOM

Table 6.

Electrical characteristics (continued)

(VIN = 12 V; TA = 0 °C to 85 °C and LDO5 connected to AVCC if not otherwise specified)

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