|
|
PDF 1203P60 Data sheet ( Hoja de datos )
| Número de pieza | 1203P60 | |
| Descripción | NCP1203 | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
 1. - PWM Current-Mode Controller  Hay una vista previa y un enlace de descarga de 1203P60 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
NCP1203
PWM Current−Mode
Controller for Universal
Off−Line Supplies Featuring
Standby and Short Circuit
Protection
Housed in SOIC−8 or PDIP−8 package, the NCP1203 represents a
major leap toward ultra−compact Switchmode Power Supplies and
represents an excellent candidate to replace the UC384X devices. Due
to its proprietary SMARTMOSt Very High Voltage Technology, the
circuit allows the implementation of complete off−line AC−DC
adapters, battery charger and a high−power SMPS with few external
components.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz switching frequency, the controller features a high−voltage
startup FET which ensures a clean and loss−less startup sequence. Its
current−mode control naturally provides good audio−susceptibility
and inherent pulse−by−pulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so−called
skip cycle mode and provides improved efficiency at light loads
while offering excellent performance in standby conditions. Because
this occurs at a user adjustable low peak current, no acoustic noise
takes place.
The NCP1203 also includes an efficient protective circuitry which,
in presence of an output over load condition, disables the output
pulses while the device enters a safe burst mode, trying to restart.
Once the default has gone, the device auto−recovers. Finally, a
temperature shutdown with hysteresis helps building safe and robust
power supplies.
Features
www.Dat•aSPhebe−t4FUre.ceoPmackages are Available
• High−Voltage Startup Current Source
• Auto−Recovery Internal Output Short−Circuit Protection
• Extremely Low No−Load Standby Power
• Current−Mode with Adjustable Skip−Cycle Capability
• Internal Leading Edge Blanking
• 250 mA Peak Current Capability
• Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
• Direct Optocoupler Connection
• Undervoltage Lockout at 7.8 V Typical
• SPICE Models Available for TRANsient and AC Analysis
• Pin to Pin Compatible with NCP1200
Applications
• AC−DC Adapters for Notebooks, etc.
• Offline Battery Chargers
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
http://onsemi.com
8
1
SOIC−8
D1, D2 SUFFIX
CASE 751
MARKING
DIAGRAMS
8
xxxxxx
ALYW
G
1
8
1
8
PDIP−8
N SUFFIX
CASE 626
xxxxxxxxx
AWL
YYWW
1
xx = Specific Device Code
A = Assembly Location
WL, L = Wafer Lot
Y, YY = Year
W, WW = Work Week
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
October, 2004− Rev. 4
1
Publication Order Number:
NCP1203/D
1 page  
NCP1203
14.0
13.8
13.6
13.4
13.2
13.0
12.8
12.6
12.4
12.2
−25
0
25 50 75
TEMPERATURE (°C)
100 125
8.4
8.2
8.0
7.8
7.6
7.4
7.2
−25
0
25 50 75
TEMPERATURE (°C)
100 125
Figure 3. VCC(on) Threshold versus
Temperature
Figure 4. VCC(min) Level versus Temperature
1000
950
900
850
800
750
700
650
600
550
500
−25
0
100 kHz
60 kHz
40 kHz
25 50 75
TEMPERATURE (°C)
100 125
Figure 5. IC Current Consumption (No Load)
www.DataSheet4U.com
versus Temperature
2.0
100 kHz
1.8
1.6
60 kHz
1.4
1.2
1.0
−25
0
40 kHz
25 50 75
TEMPERATURE (°C)
100 125
Figure 6. ICC Consumption (Loaded by 1 nF)
versus Temperature
8.0
7.5
7.0
40 & 60 kHz
6.5
6.0
5.5
100 kHz
5.0
4.5
4.0
−25
0
25 50 75
TEMPERATURE (°C)
100 125
Figure 7. HV Current Source at VCC = 10 V
versus Temperature
400
350
300
250
200
150
−25
0
25 50 75
TEMPERATURE (°C)
100 125
Figure 8. IC Consumption at VCC = 6 V
versus Temperature
http://onsemi.com
5
5 Page 
ON/OFF
NCP1203
Q1
1
2
3
4
8
7
6
5
Figure 19. Another Way of Shutting Down the IC without a Definitive Latch−Off State
Full Latching Shutdown
Other applications require a full latching shutdown, e.g.
when an abnormal situation is detected (overtemperature or
overvoltage). This feature can easily be implemented
through two external transistors wired as a discrete SCR.
When the VCC level exceeds the zener breakdown voltage,
the NPN biases the PNP and fires the equivalent SCR,
permanently bringing down the FB pin. The switching
pulses are disabled until the user unplugs the power supply.
OVP
Rhold
12 k
10 k
0.1 mF
10 k
NCP1203
18
27
36
45
CVCC LAux
Figure 20. Two Bipolars Ensure a Total Latch−Off of the SMPS in Presence of an OVP
Rhold ensures that the SCR stays on when fired. The bias
current flowing through Rhold should be small enough to let
www.DattahSehVeeCt4CUr.acmomp up (12.8 V) and down (4.9 V) when the SCR
is fired. The NPN base can also receive a signal from a
temperature sensor. Typical bipolars can be MMBT2222
and MMBT2907 for the discrete latch. The MMBT3946
features two bipolars NPN+PNP in the same package and
could also be used.
Protecting the Controller Against Negative Spikes
As with any controller built upon a CMOS technology, it
is the designer’s duty to avoid the presence of negative
spikes on sensitive pins. Negative signals have the bad habit
to forward bias the controller substrate and induce erratic
behaviors. Sometimes, the injection can be so strong that
internal parasitic SCRs are triggered, engendering
irremediable damages to the IC if they are a low impedance
path is offered between VCC and GND. If the current sense
pin is often the seat of such spurious signals, the
high−voltage pin can also be the source of problems in
certain circumstances. During the turn−off sequence, e.g.
when the user un−plugs the power supply, the controller is
still fed by its VCC capacitor and keeps activating the
MOSFET ON and OFF with a peak current limited by
Rsense. Unfortunately, if the quality coefficient Q of the
resonating network formed by Lp and Cbulk is low (e.g. the
MOSFET Rdson + Rsense are small), conditions are met to
make the circuit resonate and thus negatively bias the
controller. Since we are talking about ms pulses, the amount
of injected charge (Q = I x t) immediately latches the
controller which brutally discharges its VCC capacitor. If this
VCC capacitor is of sufficient value, its stored energy
damages the controller. Figure 21 depicts a typical negative
shot occurring on the HV pin where the brutal VCC discharge
testifies for latchup.
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet 1203P60.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 1203P60 | NCP1203 | ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |