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參數(shù)資料
| 型號(hào)： | NCP5306DWR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Three−Phase VRM 9.0 Buck Controller |
| 中文描述： | 0.1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 22/24頁 |
| 文件大?。?/td> | 879K |
| 代理商： | NCP5306DWR2 |
NCP5306
http://onsemi.com
22
Figure 28. V
DRP
Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Optimal:
V
DRP
and V
OUT
Respond to the Load Current Quickly
Without Overshooting.
Figure 29. The Value of C
AMP
Is Too High and the
Loop Gain/Bandwidth Too Low. COMP Slews Too
Slowly Which Results in Overshoot in V
OUT
.
For resistive current sensing, choose the current sense
network (R
CSx
, C
CSx
, x = 1, 2 or 3) to satisfy
RCSx
CCSx
Lo (Rsense)
(33)
This will provide an adequate starting point for R
CSx
and
C
CSx
. After the converter is constructed, the value of R
CSx
(and/or C
CSx
) should be fine
tuned in the lab by observing
the V
DRP
signal during a step change in load current (Figures
27 and 28). Tune the R
CSx
C
CSx
network to provide a
“square
wave” at the V
DRP
output pin with maximum rise
time and minimal overshoot as shown in Figure 28.
8. Error Amplifier Tuning
After the steady
state (static) AVP has been set and the
current sense network has been optimized, the Error
Amplifier must be tuned. The gain of the Error Amplifier
should be adjusted to provide an acceptable transient
response by increasing or decreasing the Error Amplifier’s
feedback capacitor (C
AMP
in Figures 14 and 16). The
bandwidth of the control loop will vary directly with the gain
of the error amplifier.
If C
AMP
is too large, the loop gain/bandwidth will be low,
the COMP pin will slew too slowly and the output voltage
will overshoot as shown in Figure 29. On the other hand, if
C
AMP
is too small, the loop gain/bandwidth will be high, the
COMP pin will slew very quickly and overshoot will occur.
Integrator “wind up” is the cause of the overshoot. In this
case, the output voltage will transition more slowly because
COMP spikes upward as shown in Figure 30. Too much loop
gain/bandwidth increases the risk of instability. In general,
one should use the lowest loop gain/bandwidth possible to
achieve acceptable transient response. This will insure good
stability. If C
AMP
is optimal, the COMP pin will slew
quickly but not overshoot and the output voltage will
monotonically settle as shown in Figure 32.
After the control loop is tuned to provide an acceptable
transient response, the steady
state voltage ripple on the
COMP pin should be examined. When the converter is
operating at full steady
state load, the peak
to
peak voltage
ripple (V
PP
) on the COMP pin should be less than 20 mV
PP
as shown in Figure 31. Less than 10 mV
PP
is ideal. Excessive
ripple on the COMP pin will contribute to jitter.
9. Current Limit Setting
When the output of the current sense amplifier (COx in the
block diagram) exceeds the voltage on the OCSET pin, the
part will enter hiccup mode. For inductive sensing, the
OCSET pin voltage should be set based on the inductor’s
maximum resistance (R
LMAX
). The design must consider
the inductor’s resistance increase due to current heating and
ambient temperature rise. Also, depending on the current
sense points, the circuit board may add additional resistance.
In general, the temperature coefficient of copper is +0.39%
per C. If using a current sense resistor (R
SENSE
), the I
LIM
pin voltage should be set based on the maximum value of the
sense resistor. To set the level of the OCSET pin:
Figure 30. The Value of C
AMP
Is Too Low and the
Loop Gain/Bandwidth Too High. COMP Moves Too
Quickly, Which Is Evident from the Small Spike in Its
Voltage When the Load Is Applied or Removed. The
Output Voltage Transitions More Slowly Because of
the COMP Spike.
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