SC4505EVB Просмотр технического описания (PDF) - Semtech Corporation
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SC4505EVB Datasheet PDF : 15 Pages
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SC4505
POWER MANAGEMENT
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Pin
Pin Name
Pin Function
1,2
PGND
Power ground.
3,4
SW
Collector of the internal power transistor. Connect to the boost inductor and the rectifying diode.
5
VO
Boost output voltage pin. Internal overvoltage protection also monitors the voltage at this pin.
Connect the output capacitor and the anode of the LED strings to this pin.
6
IO2
Provides constant source current to LED string 2.
7
IO1
Provides constant source current to LED string 1.
8
COMP
The output of the internal transconductance error amplifier. This pin is used for loop
compensation.
9
AGND
Analog ground.
10
IO2SET
Current source IO2 value set pin. By selecting the resistor connected from this pin to GND, the
corresponding maximum current on string 2 is set.
11
IO1SET
Current source IO1 value set pin. By selecting the resistor connected from this pin to GND, the
corresponding maximum current on string 1 is set.
12
EN_BL
Enable and Brightness control pin for LED backlight string 1. (See Table 2 for logic).
13
EN_FL
Enable and Brightness control pin for LED flash light string 2. (See Table 1 for logic).
14
FL_TRB
15
FTO
Flash time out pin. By selecting the capacitor connected to this pin, the time out duration is
determined. By pulling this pin to AGND, the FTO function is disabled.
16
VIN
Power Supply Pin. Bypassed with capacitors close to the pin.
Exposed Pad
The exposed pad must be soldered to the analog ground plane on the PCB for good thermal
conduction.
EN_FL
0
0
1
1
FL_TRB
Status
0
Flash disable
1
Flash disable
0
20% max. output current set by
external resistor, RO2SET
1
100% max. output current set
by external resistor, RO2SET
Table 1
Note: When EN_FL = 0
FL_TRB = 0
EN_BL = 0
The boost is turned OFF and disabled.
EN_BL
0
1
Status
Backlight disable
Backlight enable
Table 2
2007 Semtech Corp.
5
www.semtech.com
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