Telecom Cooling Design using 24V 4-Wire fans
The challenge of this telecom cooling application was to provide advanced features required by the customer into a small circuit board area. The unusual shape of the PCB was designed to “wrap” around six fans, allowing more area for fan speed control circuitry. This multi layer board has parts on both side and uses fine pitch SMT components. The success of this innovative fan speed control design resulted in it being used in three telecom cooling platforms by the customer.
CRI’s electronic design and manufacturing facilities have the capability to provide complete custom fan speed control design for telecom cooling applications from prototype to production.
SmartFan®, the Standard in Telecom Cooling Design
Telecom Cooling – Custom Fan Speed Control Specifications
- Supply voltage: -36 to -72 VDC
- Fans: Six 24 VDC, 1.5A, 4-wire fans
- Dual “buck” regulators. Fan current is 5A per regulator at 55°C
- Fan speed control based on I2C communications
- Provides fan status based on monitoring fan tach pulses
- Optically isolated logic alarm outputs for single and multiple fan failure
- I2C bus transmits circuit board inventory and temperature information
- Both power feeds and individual fans are fused
- All input and output lines have EMI suppression
- Active current limiting is provided for normal operation, startup, hotplug and fault conditions
Additional Custom Fan Speed Control Designs for Telecom Cooling Applications
Telecom Cooling Fan Control using 48V Fans
FEATURES:
- Supply Voltage: -33 to -72 VDC
- Four 4-wire 48 VDC fans
- Dual “boost” regulators up to 5.5A per regulator
- Fan Control: PWM signal based on temperature
Telecom Cooling Fan Control using 24V Fans
FEATURES:
- Supply Voltage: -36 to -72 VDC
- Six 4-wire 24 VDC fans
- Dual “buck” regulators up to 5A per regulator
- Fan Control: PWM signal based on I2C command
Telecom Cooling Fan Control using 12V Fans
FEATURES:
- Supply Voltage: -36 to -72 VDC
- Six 4-wire 12 VDC fans
- Six individual 2A “buck” regulators for a total of 12A
- Fan Control: PWM signal based on remote command
Custom Fan Tray Design – Telecom Cooling Application
SmartFan® Design Group