FAN50FC3 Datasheet, PDF (8/21 Pages) Fairchild Semiconductor – 8-Bit Programmable, 2- to 3-Phase FastvCore™ Buck Controller

Electrical Characteristics (Continued)
V_CC = 12V, FBRTN = GND, and T_A = +25°C. The • denotes specifications which apply over the full operating
temperature range.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
Power-Good Comparator (Continued)
V_CROWBAR
V_{CR_RST}
Crowbar Trip Point
Crowbar Reset Point
t1_CROWBAR Crowbar Delay Time 1
Relative to Nominal DAC Output • 100 150 200 mV
Relative to FBRTN
• 250 300 350 mV
VID Code Change
Over-Voltage to PWM Going LOW • 100 250
µs
Crowbar Blanking Time
t2_CROWBAR Crowbar Delay Time 2
VID Code Static
Over-Voltage to PWM going LOW •
400
ns
Crowbar Blanking Time
PWM Outputs
V_OL(VRTM)
V_OH(VRTM)
V_DIS
Output Voltage Low
Output Voltage High
Phase Disable Voltage
I_PWM(SINK) = 400µA
•
160 400 mV
I_PWM(SOURCE) = 400µA
•4
5
V
Applicable to PWM3 pins only.
Connect this pin to VCC to disable • V_CC -.1
V
the phase.⁽⁴⁾
Input Supply
I_DC
DC Supply Current
EN = Logic HIGH
•
8 12 mA
V_UVLO
UVLO Threshold
V_CC Rising
• 6.5 6.9 7.3 V
V_{UVLO_HYS} UVLO Hysteresis
• 0.7 0.9 1.1 V
Notes:
2. Limits at operating temperature extremes are guaranteed by design, characterization, and statistical quality control.
3. AC specifications are guaranteed by design and characterization; not production tested.
4. To operate the FAN50FC3 with fewer than three phases, PWM3 should be connected to V_CC to disable this
phase. See the Theory of Operation section for details.
© 2007 Fairchild Semiconductor Corporation
FAN50FC3 Rev. 1.0.0
8 of 21
www.fairchildsemi.com