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FCM8202TPM View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
View to exact match
FCM8202TPM
Fairchild
Fairchild Semiconductor Fairchild
FCM8202TPM Datasheet PDF : 13 Pages
First Prev 11 12 13
Figure 19. Current Feedback Flow
Figure 18. Sine-Wave Output at CW=0
Current Feedback and Protections
The current feedback circuit performs two major
functions: (1) for generating a current feedback signal
for the motor control (2) for the over-current protection.
The I_IN pin outputs 50µA current to provide a DC bias
on the I_IN terminal to prevent a negative voltage.
Equation 1 shows the I_FB and the I_IN. A 0.5V DC
bias on I_IN is recommended. The maximum average
current signal is 1V. By using these parameters, the
maximum I_FB signal swing is 0.5V~4.5V.
VI _ FB = (VS × 8) + (I BIAS _ I _ IN × RBIAS )
(1)
FCM8202 provides three levels of over-current
protection (OCP). The first level is 1.4V, is used for
overload current protection with the OCP timer delay. If
the I_IN is higher than 1.4V, the OC timer is triggered.
The OC_Latch is enabled once the timer is exceeds its
time-out limit. The second level is 1.5V, used for the
cycle-by-cycle current limit. The PWM signal is turned
off immediately when the I_IN is > 1.5V. The third level
is 2.5V, designed for short-circuit protection. If the I_IN
is > 2.5V for over three PWM pulses, all PWM outputs
(U, V, W, X, Y, Z pins) are turned off.
Protections and Faults
Table 2. Faults Table
Type
VPP OV
VPP UV
VOUT UV
RT
OS
Hall Error
HOVP
OC_Latch
SHORT
State
Free
Free, Reset
Free
Free
Free
Free
Free
Free
Free
Trigger
VPP > 18V
VPP < 8V
VOUT < 4V
RT < 1.0V
Open and Short
Hall = 000 or 111
VSENSE > 4.5V
I_IN > 1.4V
I_IN > 2.5V
© 2010 Fairchild Semiconductor Corporation
FCM8202 • Rev. 1.0.0
11
Release
VPP < 17V
VPP > 9V
VOUT > 4.5V
RT > 1.2V
FREE/nST Ê
VSENSE < 4.0V
FREE/nST Ê
FREE/nST Ê
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