参数资料
| 型号： | NCP1034DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 80% |
| 电源电压： | 10 V ~ 18 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1118 (CN2011-ZH PDF) |
| 其它名称： | NCP1034DR2GOSDKR |
NCP1034
0.3V ~1.2V
~2.6V
5V
~1.2V
~1.9V 0.3V ~1.9V 0.3V
~2.6V
5V
SS
~1.2V
~1.2V
V OUT
I OUT
R OUT
Figure 28. Overcurrent Protection (Hi ? Cup Mode)
I Pos +
R7 @ R DS(on)
f P0 +
The NCP1034 provides protection of the low ? side
MOSFET against positive overcurrent (from output to this
MOSFET). Its value can be calculated using Equation 18:
5125 * 0.184 @ R8 @ 1.25
(eq. 18)
1
(eq. 19)
2 @ p @ L @ C OUT
One zero of this LC filter is given by the output capacitance
and output capacitor ESR. Its value can be calculated by
using the following equation:
Compensation Circuit
The NCP1034 is a voltage mode buck convertor with a
f Z0 +
1
2 @ p @ C OUT @ ESR
(eq. 20)
transconductance error amplifier compensated by an
external compensation network. Compensation is needed to
achieve accurate output voltage regulation and fast transient
response. The goal of the compensation circuit is to provide
a loop gain function with the highest crossing frequency and
adequate phase margin (minimally 45 ° ).
The transfer function of the power stage (the output LC
filter) is a double pole system. The resonance frequency of
this filter is expressed as follows:
Table 1. COMPENSATION TYPES
The next parameter that must be chosen is the zero
crossover frequency f 0 . It can be chosen to be 1/10 ? 1/5 of
the switching frequency. These three parameters show the
necessary type of compensation that can be selected from
Table 1.
Zero Crossover Frequency Condition
f P0 < f Z0 < f 0 < f S /2
f P0 < f 0 < f Z0 < f S /2
f P0 < f 0 < f S /2 < f Z0
Compensation Type
Type II (PI)
Type III (PID) Method I
Type III (PID) Method II
Typical Output Capacitor Type
Electrolytic, Tantalum
Tantalum, Ceramic
Ceramic
Compensation Type II (PI)
This compensation is suitable for low ? cost electrolytic
capacitor. The zero created by the capacitor ’s ESR is a few
kHz and the zero crossover frequency is chosen to be 1/10
of the switching frequency. Components of the PI
compensation (Figure 29) network can be specified by the
following equations:
http://onsemi.com
16
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