參數(shù)資料
型號: NCP1205P
廠商: ON SEMICONDUCTOR
元件分類: 穩(wěn)壓器
英文描述: Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
中文描述: SWITCHING CONTROLLER, 125 kHz SWITCHING FREQ-MAX, PDIP8
封裝: PLASTIC, DIP-8
文件頁數(shù): 4/20頁
文件大小: 163K
代理商: NCP1205P
NCP1205
http://onsemi.com
4
Figure 3. Internal Circuit Architecture for DIP8 Version
2
3
+
+
+
Internal Regulator
Internal Clamp
DEMAG
Last Pulse of Demag
after 4
μ
s
Flip–Flop
Over Voltage
Protection (V
CC
> 40 V)
Lasts more than 128 ms
––> Protection Circuitry
V
CO
Feedback
T
off
= f (V
err
)
Max T
off
= f (Ct)
Over Current
Protection (OCP)
V(–) < 1.5 V
V
err
Max = 3 V
V
err
Min = 10 mV
Internal V
CC
Ri
Rf
1
4
5
7
6
200 ns L.E.B
2.5 V
1/3
+
8
Clock
R
Q
D
Driver
Current Comparator
2
M
HV
Demag
FB
Ct
V
CC
DRV
I
sense
Gnd
Startup
UVLO
H
= 15 V
UVLO
L
= 7.2 V
2
1 V
V
err
+
+
OVP
2.8 V
18 k
35 V Zener
V
CC
Pin 8
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