stld41pur STMicroelectronics, stld41pur Datasheet - Page 7

• Manufacturer Part Number: stld41pur
• Description: White Led Driver For Mid-size Lcd Display Backlight
• Manufacturer: STMicroelectronics

STLD41
5
Table 6.
1. Calculated as (V
2. Calculated as (V
Symbol
OT
I
V
ENHIGH
V
I
V
f
OVP
OTP
PEAK
FBMIN
T
V
PWM
V
ΔI
V
V
PWM
OUT
I
I
HYST
f
ON
ν
ν
FB
O
Q
IN
s
IH
IL
O
Input operating supply
voltage
Output current
adjustment range
Regulated voltage range
Inductor peak current
Output current variation
Quiescent current in
Standby mode
Feedback voltage
Min. feedback voltage
Frequency
Efficiency of the chip itself
(1)
Efficiency of the whole
application
Output overvoltage
protection
Overtemperature
protection
Overtemperature
hysteresis
Low and high level input
logic signal on EN pin
Enable input current
LED current rise time I
= 0 to I
PWM dimming signal
frequency
PWM signal level
Electrical characteristics
C
Values are at 25 °C, unless otherwise specified.
Electrical characteristics
IN
LED
OUT
LED
= 10 µF, C
Parameter
*I
*I
= max
(2)
LED
LED
)/(V
)/(V
IN
IN
OUT
*I
*I
IN
IN
LED
), guaranteed by design
), guaranteed by design
= 2.2 µF, L = 47 µH / 1.25 A, R
V
V
V
V
V
V
EN = LOW, V
I
PWM_IN = 30 kHz, duty cycle = 10%
V
V
V
V
V
V
V
V
V
V
V
V
LED
IN
IN
IN
IN
IN
IN
IN
IN
O
IN
IN
IN
IN
IN
IN
IN
IN
IN
= 10 x V
= 3.0 V to 5.0 V; V
= 5.0 V to 7.0 V; V
= 7.0 V to 18 V; V
= 3.0 V to 21 V
= 3 V, I
= 3.0 V
= 7 to 21 V, I
= 3 to 21 V, I
= 21 V, No load
= 21 V
= 21 V
= 3.0 V to 21 V
= 3.0 V to 21 V, V
= 10 V
= 3.0 V to 21 V
= 3.0 V to 21 V
= 3 V, V
= 120 mA, PWM_IN=HIGH
Doc ID 022283 Rev 2
LED
Test conditions
OUT
FLED_max
IN
= 120 mA
= 5.5 V
= 38 V
O
O
= 120 mA,
= 78 mA
+V
EN
OUT
OUT
OUT
RSENSE
= 21 V
= 38 V
= 38 V
= 38 V
SENSE
= 38 V
= 1.3 Ω, T
1.15*V
Min.
144
3.0
-10
1.4
1.4
25
0
IN
Electrical characteristics
A
= 25 °C, V
Typ.
160
140
1.4
35
87
79
20
10
40
2
1
Max.
IN
120
176
0.4
5.5
21
40
78
38
10
50
V
1
= 5.5 V typ.
I
MHz
Unit
kHz
mA
mV
mV
ms
µA
µA
°C
°C
%
%
%
V
V
A
V
V
V
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