- 您现在的位置：买卖IC网 > PDF目录19586 > NCP1294EDBR2G (ON Semiconductor)IC PWM CTLR FLYBACK 16TSSOP PDF资料下载
参数资料
| 型号： | NCP1294EDBR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR FLYBACK 16TSSOP |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 260kHz ~ 320kHz |
| 输入电压： | 4.7 V ~ 15 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
NCP1294
800
700
1.00
0.95
600
500
400
300
200
R T = 10 K
R T = 5.0 K
0.90
0.85
0.80
0.75
0.70
0.65
0.60
100
0
0.0001
R T = 50 K
0.001
0.01
0.55
0.50
1000
10000
100000
1000000
C T ( m F)
Figure 10. Typical Performance Characteristics,
Oscillator Frequency vs. C T
that during steady state, V COMP doesn’t change for input
voltage variations. This intuitively explains why FF voltage
mode control has superior line regulation and line transient
response. Knowing the nominal value of V IN and T ON , one
can also select the value of RC to place V COMP at the center
of its dynamic range.
Select Feedback Voltage Divider
As shown in Figure 12, the voltage divider output feeds to
the FB pin, which connects to the inverting input of the error
amplifier. The non ? inverting input of the error amplifier is
connected to a 1.27 V (typ) reference voltage. The FB pin
has an input current which has to be considered for accurate
DC outputs. The following equation can be used to calculate
R T ( W )
Figure 11. Typical Performance Characteristics,
Oscillator Duty Cycle vs. R T
12.5 m A (R1 ) R2) + VHYST (C)
where:
V IN(LOW) , V IN(HIGH) = input voltage OV and UV
threshold;
V HYST = OV hysteresis seen at V IN
It is self ? evident from equation A and B that to use this
design, V IN(HIGH) has to be two times greater than
V IN(LOW) . Otherwise, two voltage dividers have to be used
to program OV and UV separately.
V OUT
VOUT + 1.27 *
the R1 and R2 value
R2
R1 ) R2
where ? is the correction factor due to the existence of the
FB pin input current Ier.
+ (Ri ) R1 R2)Ier
Ri = DC resistance between the FB pin and the voltage
COMP
?
+
Ier
Ri
+
?
1.27
R1
FB
R2
divider output.
Ier = V FB input current, 1.3 m A typical.
Design Voltage Dividers for OV and UV Detection
In Figure 13, the voltage divider uses three resistors in
series to set OV and UV threshold seen from the input
Figure 12. The Design of Feedback Voltage Divider
Has to Consider the Error Amplifier Input Current
voltage. The values of the resistors can be calculated from
the following three equations, where the third equation is
derived from OV hysteresis requirement.
V IN
R1
R2
R3
VIN(LOW)
R2 ) R3
R2 ) R3 ) R1
+ 1.0 V
(A)
V UV
V OV
VIN(HIGH)
R3
R2 ) R3 ) R1
+ 2.0 V
(B)
Figure 13. OV/UV Monitor Divider
http://onsemi.com
11
相关PDF资料 |
PDF描述 |
|---|---|
| EBM15DTMN-S189 | CONN EDGECARD 30POS R/A .156 SLD |
| PQ1U231M2ZPH | IC REG LDO 2.3V .15A SOT-23-5 |
| MIC5255-3.2BM5 TR | IC REG LDO 3.2V .15A SOT23-5 |
| VE-BTH-CX-B1 | CONVERTER MOD DC/DC 52V 75W |
| TAP226M010SRS | CAP TANT 22UF 10V 20% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1294EDR16 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Enhanced Voltage Mode PWM Controller |
| NCP1294EDR16G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Enhanced Voltage Mode PWM Controller |
| NCP1294EDR2G | 功能描述:电流型 PWM 控制器 ANA PWM VOLT MODE CNTR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1294EDTB16G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Enhanced Voltage Mode PWM Controller |
| NCP1294EDTB16R2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Enhanced Voltage Mode PWM Controller |
发布紧急采购，3分钟左右您将得到回复。