SC5014AEVB データシートの表示（PDF） - Semtech Corporation

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SC5014AEVB

High Efficiency 2-Channel HB LED Driver with I2C Interface and Direct PWM Dimming

Semtech Corporation 

SC5014A

Pin Descriptions

Pin #

1

2

3

4

Pin

Name

UVLO

SCP

REF

FSET

Pin Function

Input under-voltage lockout pin — Device is disabled when this pin is less than 1.23V (nominal). Add a resistor

divider from this pin to the input voltage and AGND, respectively.

Short-circuit LED protection programming pin — Shorted LED protection disables the individual channel when the

current sink voltage exceeds the programmed voltage threshold. Adding a resistor divider from this pin to REF and

PGND programs the shorted-LED protection up to 20x the VSCP voltage. Pulling the pin high to VCC disables the SCP

feature on all channels.

1.23V reference voltage output pin — Connect a 1µF ceramic bypass capacitor from this pin to ground.

Step-up (boost) frequency set pin — Connect a resistor from this pin to ground to set the frequency from 200kHz to

2.2MHz.

5

NC

No connect. This can be left floating or connected to GND.

6

7

8

9

10

11 ~14

15

16

17

18

19

20

-

SCL

I2C serial clock input — This pin must be connected to ground if not used.

SDA I2C serial data input — This pin must be connected to ground if not used.

ISET

LED current programming pin — Connect an external resistor to ground to program the current in the LED strings.

For more details please refer to LED String Peak Current Programming on page 13.

Logic low fault status pin — Open-drain output is latched low when fault condition is detected: Open/Short LED,

FLT

Shorted String, OVP or OTP. Fault status can be reset by removing fault condition(s) and toggling the EN, VCC or

UVLO pins. This pin can be left floating if not used.

PWMI LED string PWM dimming control input.

IO2 ~ IO1

OVP

Regulated current sink LED channel 2 to channel 1 respectively . Connect the related IO pin to the cathode of the

bottom LED in string 2 to string 1 respectively. Connect the related IO pin to ground to disable the related LED

string during power on.

Over-voltage feedback pin — Over-voltage activated when pin voltage exceeds 1.2V. Use a resistor divider tied to

the output and GND to set the OVP level.

CS

Step-up (boost) switch current sense pin — Connect a resistor from this pin to ground for current sense - utilized in

peak current mode control loop and over-current sense circuitry.

PGND Power ground — Tie this pin to the power ground plane close to input and output decoupling capacitors.

NDRV Gate drive for the external step-up (boost) N-Channel MOSFET.

VCC

Input bias voltage supply for the IC — Accepts 4.5-5.5V inputs. Add a 1µF or larger ceramic bypass capacitor from

this pin to ground.

EN

Logic high enable pin — Pull logic high to enable the device or pull low to disable and maintain low shutdown

current.

PAD AGND thermal pad for heatsinking purposes — It should be connected to ground plane for proper circuit operation.

10

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