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| 型号： | IRCS2277S |
| 厂商： | International Rectifier |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | DEMO FOR 3-PHASE/380V MOTOR DRV |
| 标准包装： | 1 |
| 系列： | * |
IR2277S/IR2177S (PbF)
1.5 DC transfer functions
The working principle of the device can be easily
Eq. 3
OUT = 2 ? ( V RH ? V RL ) ? V in +
V RH + V RL
2
explained by Figure 13, in which the main signals
are represented.
The same equation can be referred to V RL , as
follows in Eq. 4:
Triangular
reference
SYNC
Eq. 4
OUT ? V RL = 2 ? ( V RH ? V RL ) ? V in +
V RH ? V RL
2
Vin
PO
VRH
OUT
VRL
Figure 13: Main current sensor signals and
outputs
OUT
V RH
(V RH +V RL )/2
PWM out (PO pin) gives a duty cycle which is
inversely proportional to the input signal while the
OUT pin gives the analog converted output.
Eq. 2 gives the resulting D n of the PWM output (PO
V RL
V in
pin):
Figure 15: ideal OUT/V in transfer function
Eq. 2 D n = 20 % ? 40
%
V
? V in
where V in = V inp -V inm
PO duty cycle
30%
25%
20%
15%
10%
V in
Figure 14: PO Duty Cycle ( D n )
The Voltage-to-Time conversion ( V in to PO) must be
reconstructed (see Functional Block Diagram) to
give an analog voltage output at OUT pin.
OUT pin swings from V RL to V RH , so the analog
output (referred to V SS ) follows Eq. 3:
14
www.irf.com
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