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AS3492 bảng dữ liệu(PDF) 6 Page - ams AG

tên linh kiện AS3492
Giải thích chi tiết về linh kiện  Highly Efficient 2-10 LEDs Backlight Driver with 2 PWM Inputs
PDF  19 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
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AS3492 bảng dữ liệu(HTML) 6 Page - ams AG

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1.2
5 - 18
AS3492
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
ILED1..5
MATCH
LED1...LED5 current
source matching
ILED1..5 = 20mA
-4.0
+4.0
%
ILED1..5
RIPPLE
LED1...LED5 ripple
current
BW=10MHz
ILED > 5mA
10
% of
ILED
ILED < 5mA
500
µA
ILED1..5
PWMLIN
LED1...LED5
linearity
2
ILED=20mA,
PWM frequency 300Hz
PWM>=25/255
-2
+2
%
25/255>
PWM>=1/255
-10
+10
%
fPWM
PWM input frequency
on pin ON13 or ON45
100
300
800
Hz
ILED1..5
LEAKAGE
LED1...LED5 leakage
current
current source off, TAMB < +50ºC
-0.5
0
+0.5
µA
VILED_COMP
LED1...LED5 current
source voltage
compliance
Minimum voltage between pin VOUT and
LED1...LED5, ILED<20mA
3
100
mV
Current Reference (pin ISET)
VISET
ISET voltage
1.25
V
ILED2ISET
LED current to
ISETcurrent
400
A/A
Protection Functions (see page 12)
VVOUT_MAX
VOUT overvoltage
protection
8.6
10.0
V
VVOUT_OPE
NLED
VOUT open LED
detection threshold
Voltage level on VOUT where open LED
detection is performed
8.0
8.5
8.8
V
VLED_OPEN
VVLED1..5 open
detection
an open LED is assumed if the voltage on the
current source is less than VLED_OPEN and
VOUT=VVOUT_OPENLED
92
125
mV
VLED_SHORT
VLED1..5 short
detection
voltage on LED1..5 where a shorted LED is
assumed
0.95
V
tLED_ERROR
_DEB_OPEN
VLED1..5 open
debounce time
Open LED detection debounce time
4.8
µs
tLED_ERROR
_DEB_SHORT
VLED1..5 short
debounce time
Short LED detection debounce time
4
9.0
µs
ILIMIT
Current Limit for coil
LSW (Pin SW)
510
600
685
mA
TOVTEMP
Overtemperature
Protection
Junction temperature
144
ºC
TOVTEMPHY
ST
Overtemperature
Hysteresis
5ºC
VUVLO
Undervoltage Lockout
Falling VVIN
1.8
1.9
2.1
V
Rising VVIN
VUVLO
+0.05
2.2
2.3
V
Digital Interface
VIH
High Level Input
Voltage
1.07
VVIN
V
VIL
Low Level Input
Voltage
0.0
0.68
V
RPULLDOWN
Pulldown resistor
1.8V on pad
90
250
k
1. Excluding variation of external resistor RISET; voltage difference between any set of drivers less than 200mV
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
Typ
Max
Unit



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