NCP1205 ON Semiconductor, NCP1205 Datasheet - Page 5
NCP1205
Manufacturer Part Number
NCP1205
Description
Single Ended Pwm Controller Featuring Qr Operation And Soft Frequency Foldback
Manufacturer
ON Semiconductor
Datasheet
1.NCP1205.pdf
(17 pages)
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Demag
OVP
NC
NC
HV
FB
Ct
1
2
3
4
5
6
7
Ri
Lasts more than 128 ms?
−−> Protection Circuitry
Last Pulse of Demag
Protection (OCP)
+
−
Over Current
V(−) < 1.5 V
−
+
DEMAG ?
after 4 ms
Rf
2.5 V
Figure 4. Internal Circuit Architecture for PDIP−14 Version
V
V
err
err
1/3
Max = 3 V
Min = 10 mV
+
−
http://onsemi.com
OVP
Internal V
2.0 k
5
1 V
Current Comparator
CC
V
Startup
err
Internal Regulator
Max T
R
V
T
CO
off
Flip−Flop
Clock
Feedback
= f (V
off
D
= f (Ct)
OVP
err
)
Q
UVLO
UVLO
Internal Clamp
200 ns L.E.B
2.8 V
Driver
L
H
= 7.2 V
= 15 V
+
−
+
−
V
CC
Pin 13
18 k
14
13
12
10
11
9
8
V
DRV
I
GND
NC
NC
sense
CC