Техническая Спецификация для On Semiconductor NCP1014 Evaluation Board NCP1014LEDGTGEVB NCP1014LEDGTGEVB
Модели
NCP1014LEDGTGEVB
NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
http://onsemi.com
3
PIN FUNCTION DESCRIPTION
Pin No.
(SOT--223)
Pin No.
(PDIP--7,
PDIP--7/Gull Wing)
Pin Name
Function
Description
1
1
V
CC
Powers the Internal Circuitry
This pin is connected to an external capacitor of typic-
ally 10 mF. The natural ripple superimposed on the
V
CC
participates to the frequency jittering. For im-
proved standby performance, an auxiliary V
CC
can be
connected to Pin 1. The V
CC
also includes an active
shunt which serves as an opto fail--safe protection.
--
2
NC
--
--
--
3
GND
The IC Ground
--
2
4
FB
Feedback Signal Input
By connecting an optocoupler to this pin, the peak
current setpoint is adjusted accordingly to the output
power demand.
3
5
Drain
Drain Connection
The internal drain MOSFET connection.
--
--
--
--
--
--
7
GND
The IC Ground
--
4
8
GND
The IC Ground
--
65, 100 or
130 kHz
Clock
Overload?
UVLO
Management
GND
NC
V
CC
FB
Drain
GND
GND
Figure 2. Simplified Internal Circuit Architecture
2
1
3
4
IV
CC
I?
Vclamp*
4 V
18 k
Error flag armed?
EMI Jittering
V
CC
Startup Source
Drain
Flip--Flop
DCmax = 65%
Reset
Reset
High when V
CC
< 3 V
Driver
S
Q
R
--
+
Iref = 7.4 mA
IV
CC
Set
Q
V
CC
8
Rsense
250 ns
L.E.B.
7
5
--
+
+
--
--
Soft--Start
Startup Sequence
Overload
Overload
-- +
0.5 V
Drain
*Vclamp = VCC
OFF
+ 200 mV (8.7 V Typical)