EVALED7706 STMicroelectronics, EVALED7706 Datasheet - Page 15

• Manufacturer Part Number: EVALED7706
• Description: EVALUATION BOARD FOR LED7706
• Manufacturer: STMicroelectronics

Specifications of EVALED7706

• Current - Output / Channel: 30mA
• Outputs And Type: 6, Non-Isolated
• Voltage - Output: 36 V
• Features: Dimmable, Extra 5V Output
• Voltage - Input: 4.5 ~ 36 V
• Utilized Ic / Part: LED7706
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6445

LED7706
5.1.5
Figure 9.
Switching frequency selection and synchronization
The switching frequency of the boost converter can be set in the 250 kHz-1 MHz range by
connecting the FSW pin to ground through a resistor. Calculation of the setting resistor is
made using equation 5 and should not exceed the 100 kΩ-400 kΩ range.
Equation 5
In addition, when the FSW pin is tied to AVCC, the LED7706 uses a default 660 kHz fixed
switching frequency, allowing to save a resistor in minimum component-count applications.
Figure 10. Multiple device synchronization
The FSW pin can also be used as synchronization input, allowing the LED7706 to operate
both as master or slave device. If a clock signal with a 210 kHz minimum frequency is
applied to this pin, the device locks synchronized. The signal provided to the FSW pin must
cross the 270 mV threshold in order to be recognized. The minimum pulse width which
allows the synchronizing pulses to be detected is 270 ns. An Internal time-out allows
synchronization as long as the external clock frequency is greater than 210 kHz.
R
FSW
OVP threshold setting
FSW
AVCC
V
IN
LED7706
MASTER
SGND
SYNC
LED7706
R
FSW
SGND
LX
OVSEL
=
F
2
SW
5 .
FSW
R
R
2
1
C
C
LED7706
13
10
SLAVE
V
C
OUT
OUT
SYNC
SGND
Operation description
SYNC
Sync Out
AM00602v1
AM00603v1
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