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NCP1255CD65R2G

更新时间： 2022-03-20 14:04:20
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
28页 435K
描述
Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

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NCP1255CD65R2G 数据手册

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NCP1255  
Table 4. ELECTRICAL CHARACTERISTICS  
(For typical values T = 25°C, for min/max values T = −40°C to +125°C, Max T = 150°C, V = 12 V unless otherwise noted)  
J
J
J
cc  
Symbol  
CURRENT COMPARATOR  
Rating  
Pin  
Min  
Typ  
Max  
Unit  
I
Input Bias Current @ 0.8 V input level on pin 3  
3
3
3
0.02  
0.8  
mA  
V
IB  
V
V
Maximum internal current setpoint – Tj = 25°C – pin1 grounded  
0.744  
0.72  
0.856  
0.88  
Limit1  
Limit2  
Maximum internal current setpoint – Tj from −40° to 125°C –  
pin 1 grounded  
0.8  
V
V
foldI  
Default internal voltage set point for frequency foldback trip point  
3
475  
mV  
≈ 59% of V  
limit  
V
Internal peak current setpoint freeze (≈31% of V  
)
3
3
3
−
3
3
3
250  
100  
300  
4
mV  
ns  
ns  
ms  
%
freezeI  
limit  
T
Propagation delay from current detection to gate off−state  
Leading Edge Blanking Duration  
150  
DEL  
T
LEB  
TSS  
Internal soft−start duration activated upon startup, auto−recovery  
Setpoint decrease for pin 3 biased to –250 mV – (Note 3)  
IOPPo  
IOOPv  
IOOPv  
31.3  
0.55  
0.55  
Voltage setpoint for pin 1 biased to −250 mV – (Note 3), T = 25°C  
0.51  
0.5  
0.6  
V
j
Voltage setpoint for pin 1 biased to −250 mV – (Note 3),  
T from −40° to 125°C  
j
0.62  
V
IOPPs  
Setpoint decrease for pin 1 grounded  
3
0
%
INTERNAL OSCILLATOR  
Oscillation frequency, V < V , pin 1 grounded  
Fbtrans  
f
−
−
−
−
−
−
−
61  
65  
3.2  
130  
4.1  
80  
71  
kHz  
V
OSC,nom  
FB  
V
Feedback voltage above which F increases  
sw  
FBtrans  
f
Maximum oscillation frequency for V above V  
FBmax  
120  
3.8  
76  
140  
4.2  
84  
kHz  
V
OSC,max  
FB  
V
FBmax  
Feedback voltage above which F is constant  
sw  
D
Maximum duty ratio  
%
max  
jitter  
f
Frequency jittering in percentage of f  
5
%
OSC  
f
Swing frequency over the whole frequency range  
240  
Hz  
swing  
FEEDBACK SECTION  
R
R
Internal pull−up resistor  
2
2
−
2
15  
13  
4
kW  
kW  
up  
eq  
Equivalent ac resistor from FB to gnd  
Pin 2 to current setpoint division ratio  
Feedback voltage below which the peak current is frozen  
I
ratio  
V
1
V
V
freezeF  
FREQUENCY FOLDBACK  
V
foldF  
Frequency foldback level on the feedback pin –  
≈59% of maximum peak current  
−
−
1.9  
F
trans  
Transition frequency below which skip−cycle occurs  
22  
26  
1.5  
400  
30  
30  
kHz  
V
V
End of frequency foldback feedback level, F = F  
min  
fold,end  
sw  
V
skip  
Skip−cycle level voltage on the feedback pin  
−
−
mV  
mV  
Skip  
hysteresis  
Hysteresis on the skip comparator – (Note 2)  
INTERNAL SLOPE COMPENSATION  
V
Internal ramp level @ 25°C – (Note 4)  
3
3
2.5  
20  
V
ramp  
R
Internal ramp resistance to CS pin  
kW  
ramp  
2. Guaranteed by design  
3. See characterization table for linearity over negative bias voltage – we recommend keeping the level on pin 3 below −300 mV.  
4. A 1−MW resistor is connected from pin 3 to the ground for the measurement.  
http://onsemi.com  
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