VIPER17
Energy saving VIPerPlus: HV switching regulator for flyback
converter
Datasheet - production data
Limiting current with adjustable set point
Adjustable and accurate overvoltage
protection
On-board soft-start
Safe auto-restart after a fault condition
Hysteresis thermal shutdown
Applications
Figure 1: Typical topology
Adapters for PDA, camcorders, shavers,
cellular phones, videogames
Auxiliary power supply for LCD/PDP TV,
monitors, audio systems, computer,
industrial systems, LED driver, No el-cap
LED driver
SMPS for set-top boxes, DVD players and
recorders, white goods
Description
The device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of overcurrent protection, overvoltage and
overload protections, hysteresis thermal
protection, soft-start and safe auto-restart after
any fault condition removal. The burst mode
operation and the device’s very low consumption
meet the standby energy saving regulations.
Features
800 V avalanche rugged power section
PWM operation with frequency jittering for
low EMI
Operating frequency:
60 kHz for L type
115 kHz for H type
Standby power < 30 mW at 265 V
AC
Order code
VIPER17LN / VIPER17HN
VIPER17HD / VIPER17LD
VIPER17HDTR / VIPER17LDTR
Advance frequency jittering reduces EMI filter
cost. Brown-out 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 startup
circuit is embedded in the device.
Table 1: Device summary
Package
DIP-7
SO16 narrow
Packing
Tube
Tube
Tape and reel
February 2017
DocID14419 Rev 11
1/31
www.st.com
This is information on a product in full production.
Contents
VIPER17
Contents
1
2
3
4
Block diagram.................................................................................. 3
Typical power .................................................................................. 3
Pin settings ...................................................................................... 4
Electrical data .................................................................................. 5
4.1
4.2
4.3
Maximum ratings ............................................................................... 5
Thermal data ..................................................................................... 5
Electrical characteristics .................................................................... 6
5
6
7
Typical electrical characteristics.................................................. 10
Typical circuit ................................................................................ 13
Operation descriptions ................................................................. 14
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
Power section and gate driver ......................................................... 14
High voltage startup generator ........................................................ 14
Power-up and soft-startup ............................................................... 14
Power down operation .................................................................... 17
Auto restart operation ...................................................................... 17
Oscillator ......................................................................................... 17
Current mode conversion with adjustable current limit set point ..... 18
Overvoltage protection (OVP) ......................................................... 18
About CONT pin .............................................................................. 20
Feed-back and overload protection (OLP) ...................................... 20
Burst-mode operation at no load or very light load .......................... 23
Brown-out protection ....................................................................... 23
2nd level overcurrent protection and hiccup mode .......................... 25
SO16 narrow package information .................................................. 26
DIP-7 package information .............................................................. 28
8
Package information ..................................................................... 26
8.1
8.2
9
Revision history ............................................................................ 30
2/31
DocID14419 Rev 11
VIPER17
Block diagram
1
Block diagram
Figure 2: Block diagram
2
Typical power
Table 2: Typical power
230 V
AC
Part number
Adapter
(1)
9W
Open frame
(2)
10 W
Adapter
(1)
5W
85-265 V
AC
Open frame
(2)
6W
Notes:
(1)
(2)
Typical continuous power in non ventilated enclosed adapter measured at 50 °C ambient.
Maximum practical continuous power in an open frame design at 50 °C ambient, with adequate heat sinking.
DocID14419 Rev 11
3/31
Pin settings
VIPER17
3
Pin settings
Figure 3: Connection diagram (top view)
The copper area for heat dissipation has to be designed under the DRAIN pins.
Table 3: Pin description
Pin n.
Name
DIP-7
1
SO16
1...2
GND
This pin represents the device ground and the source of the power
section.
Not available for user. This pin is mechanically connected to the
controller die pad of the frame. In order to improve the noise immunity,
is highly recommended connect it to GND (pin 1-2).
Supply voltage of the control section. This pin also provides the charging
current of the external capacitor during startup time.
Control pin. The following functions can be selected:
1. current limit set point adjustment. The internal set default value of the
cycle-by-cycle current limit can be reduced by connecting to ground an
external resistor.
2. output voltage monitoring. A voltage exceeding V
OVP
threshold (see
Table 8: "Controller section ")
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 current for loop regulation. A voltage below the threshold V
FBbm
activates the burst-mode operation. A level close to the threshold V
FBlin
means that we are approaching the
cycle-by-cycle over-current set
point.
Brownout protection input with hysteresis. A voltage below the threshold
V
BRth
shuts down (not latch) the device and lowers the power
consumption. Device operation restarts as the voltage exceeds the
threshold V
BRth
+ V
BRhyst
.
It can be connected to ground when not used.
High voltage drain pin. The built-in high voltage switched startup bias
current is drawn from this pin too. Pins connected to the metal frame to
facilitate heat dissipation.
Function
-
4
N.A.
2
5
VDD
3
6
CONT
4
7
FB
5
10
BR
7,8
13-16
DRAIN
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DocID14419 Rev 11
VIPER17
Electrical data
4
4.1
Electrical data
Maximum ratings
Table 4: Absolute maximum ratings
Value
Symbol
V
DRAIN
E
AV
I
AR
I
DRAIN
V
CONT
V
FB
V
BR
V
DD
I
DD
P
TOT
T
J
T
STG
ESD
(HBM)
ESD
(CDM)
1 to 8
1 to 8
Pin (DIP-7)
7, 8
7, 8
7, 8
7, 8
3
4
5
2
2
Parameter
Min.
Drain-to-source (ground) voltage
Repetitive avalanche energy
(limited by T
J
= 150 °C)
Repetitive avalanche current
(limited by T
J
= 150 °C)
Pulse drain current
Control input pin voltage
(with I
CONT
= 1 mA)
Feed-back voltage
Brown-out input pin voltage
(with I
BR
= 0.5 mA)
Supply voltage (I
DD
= 25 mA)
Input current
Power dissipation at T
A
< 40 °C (DIP-7)
Power dissipation at T
A
< 60 °C (SO16N)
Operating junction temperature range
Storage temperature
Human body model
Charge device model
-40
-55
-0.3
-0.3
-0.3
-0.3
Max.
800
2
1
2.5
Self limited
5.5
Self limited
Self limited
25
1
1
150
150
4
1.5
V
mJ
A
A
V
V
V
V
mA
W
W
°C
°C
kV
kV
Unit
4.2
Thermal data
Table 5: Thermal data
Symbol
R
thJP
R
thJA
R
thJA
Notes:
(1)
When
Parameter
Thermal resistance junction pin
(dissipated power = 1 W)
Thermal resistance junction ambient
(dissipated power = 1 W)
Thermal resistance junction ambient
(dissipated power = 1 W)
(1)
Max. value
SO16N
35
110
80
Max. value
DIP-7
40
110
90
Unit
°C/W
°C/W
°C/W
mounted on a standard single side FR4 board with 100 mm
2
(0.155 sq in) of Cu (35 µm thick).
DocID14419 Rev 11
5/31
Analog electronics
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