|
|
PDF VIPER25 Data sheet ( Hoja de datos )
| Número de pieza | VIPER25 | |
| Descripción | Off-line high voltage converters | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de VIPER25 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
VIPER25
Off-line high voltage converters
Features
■ 800 V avalanche rugged power section
■ Quasi-resonant (QR) control for valley
switching operation
■ Standby power < 50 mW at 265 Vac
■ Limiting current with adjustable set point
■ Adjustable and accurate overvoltage
protection
■ On-board soft-start
■ Safe auto-restart after a fault condition
■ Hysteretic thermal shutdown
Applications
■ Adapters for PDA, camcorders, shavers,
cellular phones, cordless phones, videogames
■ Auxiliary power supply for LCD/PDP TV,
monitors, audio systems, computer, industrial
systems, LED driver, No el-cap LED driver,
utility power meter
■ SMPS for set-top boxes, DVD players and
recorders, white goods
SO16 narrow
SO-16
DIP-7
Description
The device is an off-line converter with an 800 V
rugged power section, a PWM control, double
levels of overcurrent protection, overvoltage and
overload protections, hysteretic thermal
protection, soft-start and safe auto-restart after
any fault condition removal. Burst mode operation
and device very low consumption helps to meet
the standby energy saving regulations. The quasi-
resonant feature reduces EMI filter cost. Brown-
out and brown-in function protects the switch
mode power supply when the rectified input
voltage level is below the normal minimum level
specified for the system. The high voltage start-up
circuit is embedded in the device.
Figure 1. Typical topology
'&,QSXW9ROWDJH
%5 '5$,1
6)0%2
)% =&' 9'' *1'
'&2XWSXW9ROWDJH
Table 1. Device summary
Order codes
VIPER25LN / VIPER25HN
VIPER25HD / VIPER25LD
VIPER25HDTR / VIPER25LDTR
July 2010
Package
DIP-7
SO16 narrow
Doc ID 15585 Rev 4
!-V
Packaging
Tube
Tube
Tape and reel
1/40
www.st.com
40
1 page  
VIPER25
3 Pin settings
Figure 3. Connection diagram (top view)
Pin settings
Note:
The copper area for heat dissipation has to be designed under the DRAIN pins.
!-V
Table 3. Pin description
Pin n.
Name
DIP-7 SO16
Function
1 1...2 GND This pin represents the device ground and the source of the power section.
-
4
N.A.
Not available for user. It can be connected to GND (pins 1-2) or left not
connected.
2
5
VDD
Supply voltage of the control section. This pin also provides the charging
current of the external capacitor during power-up.
This is a multifunction pin.
1. Input for the zero current detection circuit for transformer demagnetization
sensing. (i.e. RLIM, RFF, ROVP and DOVP, Figure 32)
2. User defined drain current limit set-point and voltage feed forward.The
resistor, RLIM, connected between ZCD pin and GND causes the current
IZCD and then it limits the static maximum drain current.
3 6 ZCD 3. The resistor RFF, between ZCD pin and the auxiliary winding, performs
the feed-forward operation and then the drain current limitation changes
according to the converter input voltage.
4. Output overvoltage protection. A voltage exceeding VOVP threshold,
(see Table 8 on page 8), shuts the IC down reducing the device
consumption. This function is strobed and digitally filtered for high noise
immunity.
Control input for duty cycle control. Internal current generator provides bias
4
7
FB
current for loop regulation. A voltage below the threshold VFBbm activates
the burst-mode operation. A level close to the threshold VFBlin means that
we are approaching the cycle-by-cycle over-current set point.
Brownout protection input with hysteresis. A voltage below the threshold
5
8
BR
VBRth shuts down (not latch) the device and lowers the power consumption.
Device operation restarts as the voltage exceeds the threshold VBRth +
VBRhyst. It can be connected to ground when not used.
High voltage drain pin. The built-in high voltage switched start-up bias
7,8 13...16 DRAIN current is drawn from this pin too. Pins connected to the metal frame to
facilitate heat dissipation.
Doc ID 15585 Rev 4
5/40
5 Page 
VIPER25
Typical electrical characteristics
5 Typical electrical characteristics
Figure 7. Current limit vs TJ
Figure 8. Drain start voltage vs TJ
Figure 9. HFB vs TJ
Figure 10. Brown-out threshold vs TJ
Figure 11. Brown-out hysteresis vs TJ Figure 12. Brown-out hysteresis current
vs TJ
Doc ID 15585 Rev 4
11/40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet VIPER25.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| VIPER20 | SMPS PRIMARY I.C. |  STMicroelectronics |
| VIPer20A | SMPS PRIMARY I.C. | STMicroelectronics |
| VIPER20A-E | SMPS primary IC | ST Microelectronics |
| VIPer20ADIP | SMPS PRIMARY I.C. | STMicroelectronics |
| 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 |