STEVAL-ISA056V1 STMicroelectronics, STEVAL-ISA056V1 Datasheet - Page 28

• Manufacturer Part Number: STEVAL-ISA056V1
• Description: BOARD EVAL BASED ON PM6600
• Manufacturer: STMicroelectronics
• Type: PWM Controllersr

Specifications of STEVAL-ISA056V1

• Design Resources: STEVAL-ISA056V1 Gerber Files STEVAL-ISA056V1 Schematic STEVAL-ISA056V1 Bill of Material
• Current - Output / Channel: 30mA
• Outputs And Type: 6, Non-Isolated
• Voltage - Output: 36 V
• Features: Dimmable
• Voltage - Input: 4.5 ~ 28V
• Utilized Ic / Part: PM6600
• Input Voltage: 4.5 V to 28 V
• Output Voltage: 36 V
• Product: Power Management Modules
• Core Chip: PM6600
• Topology: Boost
• No. Of Outputs: 1
• Dimming Control Type: PWM
• Mcu Supported Families: PM6600
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PM6600
• Other names: 497-8414

Operation description
7.3
28/60
Figure 44. OVP threshold setting
Switching frequency selection and synchronization
The switching frequency of the boost converter can be set in the 200 kHz-1 MHz range by
connecting the FSW pin to ground through a resistor. Calculation of the setting resistor is
made using equation 3 and should not exceed the 80 kΩ-400 kΩ range.
Equation 6
In addition, when the FSW pin is tied to AVCC, the PM6600 uses a default 660 kHz fixed
switching frequency, allowing to save a resistor in minimum components-count applications.
Figure 45. Multiple device synchronization
The FSW pin can also be used as a synchronization input, allowing the PM6600 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 (300 mV threshold). An Internal time-out
allows synchronization as long as the external clock frequency is greater than 210 kHz.
Keeping the FSW pin voltage lower than 300 mV for more than 1/210 kHz
the device turn off. Normal operation is resumed as soon as FSW rises above the
mentioned threshold and the soft-start sequence is repeated.
R
FSW
FSW
AVCC
V
IN
PM6600
MASTER
SGND
Doc ID 14248 Rev 7
PM6600
SYNC
R
SGND
FSW
LX
OVSEL
=
f
2
SW
5 .
FSW
R
R
2
1
PM6600
V
SLAVE
OUT
C
C
SYNC
13
10
SGND
C
OUT
SYNC
≈
5 μs results in
Sync Out
PM6600