ZY8105 Power-One, ZY8105 Datasheet - Page 24

• Manufacturer Part Number: ZY8105
• Description: Zy8105 5a Dc-dc Intelligent Pol
• Manufacturer: Power-One

directly via the I
register.
8.4.5
Feedback loop compensation can be programmed in
the GUI PWM Controller window by setting
frequency of poles and zeros of the transfer function.
The transfer function of the POL converter is shown
in Figure 42. It is a third order function with two
zeros and three poles. Pole 1 is the integrator pole,
Pole 2 is used in conjunction with Zero 1 and Zero 2
to adjust the phase lead and limit the gain increase
in mid band. Pole 3 is used as a high frequency low-
pass filter to limit PWM noise.
Positions of poles and zeroes are determined by
coefficients of the digital filter.
characterized by four numerator coefficients (C
C
B
when desired frequency of poles and zeros is
entered in the GUI PWM Controller window. The
ZD-01740 Rev. 1.0
Magnitude[dB]
3
2
).
, C
Phase
3
The coefficients are automatically calculated
-135
-180
) and three denominator coefficients (B
+45
-45
-90
50
40
30
20
10
[°]
0
Feedback Loop Compensation
Figure 42. Transfer Function of PWM
0.1
0.1
2
C bus by writing into the DCL
1
1
Z1
P1 Z2
10
10
P2
100
100
P3
The filter is
www.power-one.com
1000
1000
P1: Pole 1
P2: Pole 3
P3: Pole 3
Z1: Zero 1
Z2: Zero 2
1
0
, B
, C
[kHz]
[kHz]
Freq
Freq
1
2
,
,
8V to 14V Input
coefficients are stored in the C0H, C0L, C1H, C1L,
C2H, C2L, C3H, C3L, B1, B2, and B3 registers.
Note :
Programming feedback loop compensation allows
optimizing POL performance for various application
conditions. For example, increase in bandwidth can
significantly improve dynamic response.
8.5
The
performance parameters such as output voltage,
output current, and temperature.
The output voltage is measured at the output sense
pins, output current is measured using the ESR of
the output inductor and temperature is measured by
the thermal sensor built into the controller IC. Output
current readings are adjusted based on temperature
readings to compensate for the change of ESR of
the inductor with temperature.
An 8-Bit Analog to Digital Converter (ADC) converts
the output voltage, output current, and temperature
into a digital signal to be transmitted via the serial
interface.
frequency of 700 Hz for all three values.
Monitored parameters are stored in registers (VOM,
IOM, and TMON) that are continuously updated. If
the Retrieve Monitoring bits in the GUI Group
Configuration window shown in Figure 44 are
checked, those registers are being copied into the
ring buffer located in the DPM. Contents of the ring
buffer can be displayed in the GUI IBS Monitoring
Window shown in Figure 45 or it can be read directly
via the I
as described in the ‘”DPM Programming Manual”.
ZY8105 5A DC-DC Intelligent POL
frequencies into the digital filter coefficients. It is strongly
recommended to use the GUI to determine the filter
coefficients.
POL
The
Performance Parameters Monitoring
2
C bus using high and low level commands
GUI automatically transforms
The ADC allows a minimum sampling
converters
•
0.5V to 5.5V Output
can
monitor
Page 24 of 28
Data Sheet
zero and
their
own
pole