STFPC311BTR STMicroelectronics, STFPC311BTR Datasheet - Page 29

• Manufacturer Part Number: STFPC311BTR
• Description: IC CTRL/DRIVER FRONT PNL 52-PQFP
• Manufacturer: STMicroelectronics

Specifications of STFPC311BTR

• Display Type: Vacuum Fluorescent (VF)
• Interface: Serial
• Current - Supply: 5mA
• Voltage - Supply: 3 V ~ 33.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 52-MQFP, 52-PQFP
• Maximum Operating Temperature: + 85 C
• Maximum Clock Frequency: 1 MHz
• Maximum Output Current: 25 mA
• Maximum Power Dissipation: 1200 mA
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 497-8394 - BOARD DEMO STFPC311/ST72264497-6454 - BOARD EVAL BASED ON STFPC311
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Configuration: -
• Digits Or Characters: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-6107-2

STFPC311
10.1
Power consumption estimation
The maximum power consumption is comprised of the Vacuum Florescent Display (VFD) driver
dissipation, Load Resistance (RL), LED driver dissipation, and dynamic power consumption.
P
Where,
●
●
●
●
●
If the segment current (ISEG) = 3mA, grid current (IGRID) = 15mA, and the LED current =
20mA, then:
To finish this example:
The maximum power consumption (Total) = 557.5mW
Where,
MAX
P
VFD = Vacuum Florescent Display driver dissipation,
R
LED = LED driver dissipation, and
PDYN = dynamic power consumption.
FIP = (#segments x 6) + [#grids/(#grids +1)] x 30mW,
RL dissipation = (VDD – VSS)2 ÷ 50(segment + 1mW),
LED driver dissipation = #LEDs x 20mW, and
PDYN = VDD x 5mW.
FIP driver dissipation = 16 x 6 + 12/13 x 30 = 124mW
RL dissipation = 33.32/50 x 17 = 377mW
LED driver dissipation = 2 x 20 = 40
PDYN = 3.3 x 5 = 16.5mW
VSS = –30V,
VDD = 3.3V, and the application is in 16-segment, 12-digit mode.
= V
MAX
L
= load resistance,
FD
= maximum power consumption,
+ R
L
+ LED + P
DYN
10 Maximum rating
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