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參數(shù)資料
| 型號： | NCP5331FTR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Phase PWM Controller with Integrated Gate Drivers |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數(shù)： | 30/38頁 |
| 文件大小： | 424K |
| 代理商： | NCP5331FTR2 |
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NCP5331
http://onsemi.com
30
NOTE:
The value of C
A1
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.
Figure 39. COMP Tuning, Bandwidth Too High
Figure 38. COMP Tuning, Bandwidth Too Low
NOTE:
The value of C
A1
is too high and the loop gain/
bandwidth too low. COMP slews too slowly which
results in overshoot in V
CORE
.
Figure 40. COMP Tuning, Bandwidth Optimal
NOTE:
The value of C
A1
is optimal. COMP slews quickly
without spiking or ringing. V
CORE
does not overshoot
and monotonically settles to its final value.
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. Basically, 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
A1
in the Applications
Diagram). The bandwidth of the control loop will vary
directly with the gain of the error amplifier.
If C
A1
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 38. On the other hand, if C
A1
is too small the loop gain/bandwidth will be high, the COMP
pin will slew very quickly and overshoot. 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 39. Too much loop
gain/bandwidth increase the risk of instability. In general,
one should use the lowest loop gain/bandwidth as possible
to achieve acceptable transient response - this will insure
good stability. If C
A1
is optimal the COMP pin will slew
quickly but not overshoot and the output voltage will
monotonically settle as shown in Figure 40.
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 on
the COMP pin should be less than 20 mVpp as shown in
Figure 41. Less than 10 mVpp is ideal. Excessive ripple on
the COMP pin will contribute to output voltage jitter.
9. Current Limit Setting
When the output of the current sense amplifier (CO1 or
CO2 in the block diagram) exceeds the voltage on the I
LIM
pin the part will enter hiccup mode. For inductive sensing,
the I
LIM
pin voltage should be set based on the inductor’s
maximum resistance (R
LMAX
). The design must consider
NOTE:
At full load the peak-to-peak voltage ripple on the
COMP pin should be less than 20 mV for a
well-tuned/stable controller. Higher COMP voltage
ripple will contribute to output voltage jitter.
Figure 41. COMP Ripple for a Stable System
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| NCP5331FTR2G | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate Drivers for Athlon RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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| NCP5332ADWR2 | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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