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参数资料
| 型号： | NCP1034BCK5VGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 48/5V 5A PWR SUPPLY |
| 设计资源： | NCP1034BCK5VGEVB Schematic NCP1034BCK5VGEVB Gerber Files NCP1034BCK5VGEVB Bill of Materials |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 5A |
| 输入电压： | 38.4 ~ 57.6 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1034 |
| 其它名称： | NCP1034BCK5VGEVB-ND NCP1034BCK5VGEVBOS |
NCP1034
V OUT
for tantalum output capacitors, which have a higher ESR
than ceramic, and its zeros and poles can be calculated
R1
shown below:
f Z1 + 0.75 @ f P0
f P2 + f Z0
f P3 +
R2
V ref
?
+
OTA
R C1
C C1
C C2 *
f Z2 + f P0
(eq. 22)
f S
2
The second one (method II) is for ceramic capacitors:
*Optional
Figure 29. PI compensation (II Type)
f Z2 + f 0 @
f P2 + f 0 @
1 * sin q max
1 ) sin q max
1 ) sin q max
1 * sin q max
(eq. 23)
R C1 +
2 @ p @ f 0 @ L @ V RAMP @ V OUT
ESR @ V IN @ V ref @ gm
f Z1 + 0.5 @ f Z2
f P3 + 0.5 @ f S
C C1 +
C C2 +
R C1 uu
C C1 +
C C2 +
V IN @ R C1
R FB1 +
R1 +
* R FB1
1
0.75 @ 2 @ p @ f P0 @ R C1
(eq. 21)
1
p @ R C1 @ f S
V OUT * V ref
R1 + @ R2
V ref
V RAMP is the peak ? to ? peak voltage of the oscillator ramp
and gm is the transconductance error amplifier gain.
Capacitor C C2 is optional.
Compensation Type III (PID)
Tantalum and ceramics capacitors have lower ESR than
electrolytic, so the zero of the output LC filter goes to a
higher frequency above the zero crossover frequency. This
situation needs to be compensated by the PID compensation
network that is show in Figure 30.
V OUT
C C2
The remaining calculations are the same for both methods.
2
gm
1
2 @ p @ f Z1 @ R C1
1
2 @ p @ f P3 @ R C1
2 @ p @ f 0 @ L @ V RAMP @ C OUT
C FB1 + (eq. 24)
1
2 p @ C FB1 @ f P2
1
2 @ p @ C FB1 @ f Z2
V ref
R2 + @ R1
V OUT * V ref
To check the design of this compensation network, the
equation must be true
u (eq. 25)
R1 @ R FB1 ) R2 @ R FB1 @ R1 @ R2
R FB1
C FB1
R1
R2
V REF
R C1
?
OTA
+
C C1
R1 @ R2 @ R FB1 1
gm
If it is not true, then a higher value of R C1 must be selected.
Input Power Supply
The NCP1034 controller and built ? in drivers need to be
powered through V CC , DRVV CC and V b pins with a voltage
between 10 V – 18 V. The supply current requirement is a
summation of the static and dynamic currents. Static current
consumption can be calculated by the following equation:
Figure 30. PID Compensation (III Type)
There are two methods to select the zeros and poles of
compensation network. The first one (method I) is useable
http://onsemi.com
17
I CS + I CC ) I C ) I B
(eq. 26)
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