STCF02 STMicroelectronics, STCF02 Datasheet - Page 13

• Manufacturer Part Number: STCF02
• Description: HIGH POWER WHITE LED DRIVER
• Manufacturer: STMicroelectronics

Specifications of STCF02

• Drives One Power White Led: up to 600mA between 2.7 to 4.5V
• Torch Mode: up to 250 mA

STCF02
Figure 12. Middle Flash Current (as a percentage of flash current) vs R
6.5
To select this operating mode the Enable pins have to be connected to any one of the follow states:
EN1 = 0, EN2 = 1, EN3 = x
EN1 = 1, EN2 = 1, EN3 = 1.
The STCF02 can continuously provide a torch current adjustable between 25mA and 250mA. The torch
current adjustment is made by resistor R
voltage across R
I
If the programmed Flash current is 600mA (R
R
During Torch operation mode the MOS Switch between FB1 and RTBY pins is opened.
The NTC divider for measuring LED temperature is active.
6.6
When the device is not used, two shutdown modes are available. They can be selected by the enable
pins:
EN1=0, EN2=0, EN3=X
With this combination the NTC divider for measuring of LED temperature is not active. The quiescent
current is less than 1µA.
EN=1, EN2=0, EN3=1
This combination of enable pins provides shutdown modes with an active NTC divider for sensing LED
temperature. This Mode is useful for measuring the temperature before starting both TORCH and FLASH
MODE operations.
TORCH
TORCH
=160mV/(R
resistance is equal to 0.37Ω .
Torch mode
Shutdown mode
FLASH
FLASH
+R
+R
TORCH
TORCH
. The torch current is then programmed using the following equation:
).
TORCH
FLASH
(
Figure 2
= 0.27Ω) and a 250mA Torch current is needed, the
). The control loop uses the FB1 pin to sense the
MF
Detailed operating description
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