This is information on a product in full production.
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VIPER06
Energy saving high voltage converter for direct feedback
Datasheet - production data
Applications
Replacement of capacitive power supplies
Home appliances
Power metering
LED drivers
Description
The VIPER06 is an offline converter with an
Figure 1: Typical application
800 V avalanche rugged power section, a PWM
controller, a user-defined overcurrent limit,
open-loop failure protection, hysteretic thermal
protection, soft startup and safe auto-restart after
any fault condition. The device is able to power
itself directly from the rectified mains, eliminating
the need for an auxiliary bias winding. Advanced
frequency jittering reduces EMI filter cost. Burst
mode operation and the device’s very low power
consumption both help to meet the standards set
by energy-saving regulations.
Features
800 V avalanche rugged power section
PWM operation with frequency jittering for
low EMI
Operating frequency:
30 kHz for VIPER06Xx
60 kHz for VIPER06Lx
115 kHz for VIPER06Hx
No need for an auxiliary winding in
low-power applications
Standby power < 30 mW at 265 VAC
Limiting current with adjustable set point
On-board soft-start
Safe auto-restart after a fault condition
Hysteretic thermal shutdown
16 Layout guidelines and design recommendations ....................... 20
17 Package information ..................................................................... 22
17.1 SSO10 package information ........................................................... 22
17.2 DIP-7 package information .............................................................. 24
18 Ordering information ..................................................................... 26
19 Revision history ............................................................................ 27
Page 3
VIPER06
Block diagram
DocID022794 Rev 2
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Part number
230 VAC
85-265 VAC
Adapter
(1)
Open frame
(2)
Adapter
(1)
Open frame
(2)
VIPER06
6 W
8 W
4 W
5 W
Notes:
(1)
Typical continuous power in non-ventilated enclosed adapter measured at 50 °C ambient.
(2)
Maximum practical continuous power in an open-frame design at 50 °C ambient, with adequate heat sinking.
1 Block diagram
Figure 2: Block diagram
2 Typical power
Table 1: Typical power
Page 4
Pin settings
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The copper area for heat dissipation has to be designed under the DRAIN pins.
Pin
Name
Function
DIP-7
SSO10
1 1 GND
Connected to the source of the internal power MOSFET and
controller ground reference.
2 2 VDD
Supply voltage of the control section. This pin provides the charging
current of the external capacitor.
3 3 LIM
This pin allows setting the drain current limitation. The limit can be
reduced by connecting an external resistor between this pin and
GND. Pin left open if default drain current limitation is used.
4 4 FB
Inverting input of the internal transconductance error amplifier.
Connecting the converter output to this pin through a single resistor
results in an output voltage equal to the error amplifier reference
voltage (see V
FB_REF
in Table 6: "Supply section "). An external
resistor divider is required for higher output voltages.
5
5
COMP
Output of the internal transconductance error amplifier. The
compensation network has to be placed between this pin and GND
to achieve stability and good dynamic performance of the voltage
control loop. The pin is used also to directly control the PWM with
an optocoupler. The linear voltage range extends from V
COMPL
to
V
COMPH
(Table 6: "Supply section ").
7, 8
6-10
DRAIN
High-voltage drain pins. The built-in high-voltage switched startup
bias current is drawn from these pins too. Pins connected to the
metal frame to facilitate heat dissipation.
3 Pin settings
Figure 3: Connection diagram (top view)
Table 2: Pin description
Page 5
VIPER06
Electrical data
DocID022794 Rev 2
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Symbol
Pin (DIP-7)
Parameter
Value
Unit
Min.
Max.
V
DRAIN
7, 8
Drain-to-source (ground) voltage
800
V
EAV
7, 8
Repetitive avalanche energy
(limited by TJ = 150 °C)
2
mJ
IAR
7, 8
Repetitive avalanche current
(limited by TJ = 150 °C)
1
A
I
DRAIN
7, 8
Pulse drain current
(limited by TJ = 150 °C)
2.5
A
V
COMP
5
Input pin voltage
-0.3
3.5 V VFB
4
Input pin voltage
-0.3
4.8 V V
LIM
3
Input pin voltage
-0.3
2.8
V
VDD
2
Supply voltage
-0.3
Self-
limited
V
IDD
2
Input current
20
mA
P
TOT
Power dissipation at TA < 40 °C (DIP-7)
1
W
Power dissipation at TA < 50 °C (SSO10)
1 W TJ
Operating junction temperature range
-40
150
°C
T
STG
Storage temperature
-55
150
°C
Symbol
Parameter
Max. value
SSO10
Max. value
DIP-7
Unit
R
thJP
Thermal resistance junction pin
(dissipated power = 1 W)
35
40
°C/W
R
thJA
Thermal resistance junction ambient
(dissipated power = 1 W)
145
110
°C/W
R
thJA
Thermal resistance junction ambient
(dissipated power = 1 W)
(1)
90
90
°C/W
Notes:
(1)
When mounted on a standard single side FR4 board with 100 mm2 (0.155 sq in) of Cu (35 µm thick).
4 Electrical data
4.1 Maximum ratings
Table 3: Absolute maximum ratings
4.2 Thermal data
Table 4: Thermal data
Page 6
Electrical data
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Figure 4: R
thja
vs A
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VIPER06
Electrical data
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Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
V
BVDSS
Breakdown voltage
I
DRAIN
= 1 mA, V
COMP
= GND,
TJ = 25 °C
800
V
I
OFF
OFF state drain current
V
DRAIN
= max rating,
V
COMP
= GND
60
µA
R
DS(on)
Drain-source on-state resistance
I
DRAIN
= 0.2 A, TJ = 25 °C
32 Ω I
DRAIN
= 0.2 A, TJ = 125 °C
67
Ω
C
OSS
Effective (energy related) output
capacitance
V
DRAIN
= 0 to 640 V
10 pF
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Voltage
V
DRAIN_START
Drain-source startup voltage
25
45
V
I
DDch1
Startup charging current
V
DRAIN
= 100 V to 640 V,
VDD = 4 V
-0.6 -1.8
mA
I
DDch2
Charging current during
operation
V
DRAIN
= 100 V to 640 V,
VDD = 9 V falling edge
-7 -14
mA
VDD
Operating voltage range
11.5
23.5 V V
DDclamp
VDD clamp voltage
IDD = 15 mA
23.5
V
V
DDon
VDD startup threshold
12
13
14
V
V
DDCSon
VDD on internal high-voltage
current generator threshold
9.5
10.5
11.5 V V
DDoff
VDD undervoltage shutdown
threshold
7 8 9
V
Current
I
DD0
Operating supply current, not
switching
F
OSC
= 0 kHz, V
COMP
= GND
0.6
mA
I
DD1
Operating supply current,
switching
V
DRAIN
= 120 V, F
OSC
= 30 kHz
1.3
mA
V
DRAIN
= 120 V, F
OSC
= 60 kHz
1.45
mA
V
DRAIN
= 120 V, F
OSC
= 115 kHz
1.6
mA
I
DDoff
Operating supply current with
VDD < V
DDoff
V
DD
= 5 V
0.35
mA
I
DDol
Open-loop failure current
threshold
VDD = V
DDclamp VCOMP
= 3.3 V
4
mA
a
4.3 Electrical characteristics
(TJ = -25 to 125 °C, VDD = 14 Va unless otherwise specified).
Figure 20: Flyback converter (isolated output without optocoupler)
Figure 21: Buck converter
Page 14
Power section
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7 Power section
The power section is implemented with an N-channel power MOSFET with a breakdown
voltage of 800 V min. and a typical R
of 32 Ω. It includes a SenseFET structure to
DS(on)
allow virtually lossless current sensing and the thermal sensor.
The gate driver of the power MOSFET is designed to supply a controlled gate current
during both turn-ON and turn-OFF in order to minimize common-mode EMI. During UVLO
conditions, an internal pull-down circuit holds the gate low in order to ensure that the power
MOSFET cannot be turned ON accidentally.
8 High voltage current generator
The high-voltage current generator is supplied by the DRAIN pin. At the first startup of the
converter it is enabled when the voltage across the input bulk capacitor reaches the
V
DRAIN_START
voltage reaches the V
voltage current generator is turned OFF. The VIPER06 is powered by the energy stored in
the VDD capacitor.
In a steady-state condition, if the self-biasing function is used, the high-voltage current
generator is activated between V
delivering I
off-time (see Figure 22: "Power-on and power-off").
threshold, sourcing a I
threshold, the power section starts switching and the high-
DDon
, see Table 6: "Supply section " to the VDD capacitor during the MOSFET
DDch2
current (see Table 6: "Supply section "). As the VDD
DDch1
DDCSon
and V
(see Table 6: "Supply section "),
DDon
The device can also be supplied through the auxiliary winding in which case the highvoltage current source is disabled during steady-state operation, provided that VDD is
above V
DDCSon
.
At converter power-down, the VDD voltage drops and the converter activity stops as it falls
below the V
threshold (see Table 6: "Supply section ").
DDoff
Figure 22: Power-on and power-off
Page 15
VIPER06
Oscillator
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9 Oscillator
The switching frequency is internally fixed at 30 kHz or 60 kHz or 115 kHz (respectively
part numbers VIPER06Xx, VIPER06Lx and VIPER06Hx).
The switching frequency is modulated by approximately ±3 kHz (30 kHz version) or ±4 kHz
(60 kHz version) or ±8 kHz (115 kHz version) at 230 Hz (typical) rate, so that the resulting
spread spectrum action distributes the energy of each harmonic of the switching frequency
over a number of sideband harmonics having the same energy on the whole, but smaller
amplitudes.
10 Soft startup
During the converter’s startup phase, the soft-start function progressively increases the
cycle-by-cycle drain current limit, up to the default value I
further limited and the output voltage is progressively increased, reducing the stress on the
secondary diode. The soft-start time is internally fixed to tSS, see typical value in Table 7:
"Controller section ", and the function is activated for any attempt of converter startup and
after a fault event.
This function helps prevent saturation of the transformer during startup and short-circuit.
. In this way the drain current is
Dlim
11 Adjustable current limit set point
The VIPER06 includes a current-mode PWM controller. The drain current is sensed cycleby-cycle through the integrated resistor R
inverting input of the PWM comparator, see Figure 2: "Block diagram". As soon as the
sensed voltage is equal to the voltage derived from the COMP pin, the power MOSFET is
switched OFF.
In parallel with the PWM operations, the comparator OCP, see Figure 2: "Block diagram",
checks the level of the drain current and switches OFF the power MOSFET in case the
current is higher than the threshold I
The level of the drain current limit I
, see Table 7: "Controller section ".
Dlim
can be reduced using a resistor R
Dlim
between the LIM and GND pins. Current is sunk from the LIM pin through the resistor R
and the setup of I
R
is shown in Figure 14: "IDlim vs RLIM".
LIM
When the LIM pin is left open or if R
fixed to its default value, I
depends on the level of this current. The relation between I
Dlim
has a high value (i.e. > 80 kΩ), the current limit is
LIM
, as given in Table 7: "Controller section ".
Dlim
and the voltage is applied to the non-
SENSE
connected
LIM
Dlim
LIM
and
Page 16
FB pin and COMP pin
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12 FB pin and COMP pin
The device can be used both in non-isolated and isolated topology. In non-isolated
topology, the feedback signal from the output voltage is applied directly to the FB pin as the
inverting input of the internal error amplifier having the reference voltage, V
7: "Controller section ".
REF_FB,
see Table
The output of the error amplifier sources and sinks the current, I
, respectively to and
COMP
from the compensation network connected on the COMP pin. This signal is then compared
in the PWM comparator with the signal coming from the SenseFET in order to switch off
the power MOSFET on a cycle-by-cycle basis. See the Figure 2: "Block diagram" and the
Figure 23: "Feedback circuit".
When the power supply output voltage is equal to the error amplifier reference voltage,
V
, a single resistor has to be connected from the output to the FB pin. For higher
REF_FB
output voltages the external resistor divider is needed. If the voltage on the FB pin is
accidentally left floating, an internal pull-up protects the controller.
The output of the error amplifier is externally accessible through the COMP pin and it’s
used for the loop compensation, usually an RC network.
As shown in Figure 23: "Feedback circuit", in case of an isolated power supply, the internal
error amplifier has to be disabled (FB pin shorted to GND). In this case an internal resistor
is connected between an internal reference voltage and the COMP pin, see Figure 23:
"Feedback circuit". The current loop has to be closed on the COMP pin through the opto-
transistor in parallel with the compensation network. The V
V
and V
COMPL
When the voltage V
shown in Figure 24: "COMP pin voltage versus IDRAIN".
COMPH
drops below the voltage threshold V
COMP
dynamic range is between
COMP
, the converter enters
COMPL
burst mode, see Section 13: "Burst mode".
When the voltage V
rises above the V
COMP
threshold, the peak drain current, as well
COMPH
as the deliverable output power, will reach its limit.
Figure 23: Feedback circuit
Page 17
VIPER06
Burst mode
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Figure 24: COMP pin voltage versus IDRAIN
13 Burst mode
When the voltage V
the OFF state and the consumption is reduced to the I
"Supply section ". In reaction to the loss of energy, the V
soon as it exceeds the threshold V
with a level of consumption equal to the I
referred to as “burst mode” and shown in Figure 25: "Load-dependent operating modes:
timing waveforms", reduces the average frequency, which can go down even to a few
hundreds hertz, thus minimizing all frequency-related losses and making it easier to comply
with energy-saving regulations. During burst mode, the drain current limit is reduced to the
value I
issue.
(given in Table 7: "Controller section ") in order to avoid the audible noise
Automatic auto-restart after overload or shortcircuit
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14 Automatic auto-restart after overload or short-circuit
The overload protection is implemented automatically using the integrated up-down
counter. Every cycle, it is incremented or decremented depending upon the current logic
detection of the limit condition or not. The limit condition is the peak drain current, I
given in Table 7: "Controller section " or the one set by the user through the R
LIM
shown in Figure 14: "IDlim vs RLIM". After the reset of the counter, if the peak drain current
is continuously equal to the level I
t
, at which point the power MOSFET switch ON will be disabled. It will be activated
OVL
again through the soft-start after the t
, the counter will be incremented until the fixed time,
Dlim
RESTART
time (see Figure 26: "Timing diagram: OLP
sequence (IC externally biased)" and Figure 27: "Timing diagram: OLP sequence (IC
internally biased)") and the time values mentioned in Table 7: "Controller section ".
For overload or short-circuit events, the power MOSFET switching will be stopped after a
period of time dependent upon the counter with a maximum equal to t
. The protection
OVL
sequence continues until the overload condition is removed, see Figure 26: "Timing
diagram: OLP sequence (IC externally biased)" and Figure 27: "Timing diagram: OLP
sequence (IC internally biased)". This protection ensures a low repetition rate of restart
attempts of the converter, so that it works safely with extremely low power throughput and
avoids overheating the IC in case of repeated overload events. If the overload is removed
before the protection tripping, the counter will be decremented cycle-by-cycle down to zero
and the IC will not be stopped.
If the power supply has been designed using flyback topology and the VIPER06 is supplied
by an auxiliary winding, as shown in Figure 28: "FB pin connection for non-isolated flyback"
and Figure 29: "FB pin connection for isolated flyback", the converter is protected against
feedback loop failure or accidental disconnections of the winding.
The following description is applicable for the schematics of Figure 28: "FB pin connection
for non-isolated flyback" and Figure 29: "FB pin connection for isolated flyback",
respectively the non-isolated flyback and the isolated flyback.
If RH is open or RL is shorted, the VIPER06 works at its drain current limitation. The output
voltage, V
output through the secondary-to-auxiliary turns ratio.
, will increase as does the auxiliary voltage, V
OUT
, which is coupled with the
AUX
As the auxiliary voltage increases up to the internal VDD active clamp, V
DDclamp
(the value is
given in Table 7: "Controller section ") and the clamp current injected on the VDD pin
exceeds the latch threshold, I
(the value is given in Table 7: "Controller section "), a fault
DDol
signal is internally generated.
In order to distinguish an actual malfunction from a bad auxiliary winding design, both the
above conditions (drain current equal to the drain current limitation and current higher than
I
through the VDD clamp) have to be verified to reveal the fault.
DDol
If RL is open or RH is shorted, the output voltage, V
voltage V
(for non-isolated flyback) or to the external TL voltage reference (for
REF_FB
, will be clamped to the reference
OUT
isolated flyback).
Figure 28: FB pin connection for non-isolated flyback
Page 20
Layout guidelines and design recommendations
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Figure 29: FB pin connection for isolated flyback
16 Layout guidelines and design recommendations
A proper printed circuit board layout is essential for correct operation of any switch-mode
converter and this is true for the VIPer06 as well. Also some trick can be used to make the
design rugged versus external influences.
Careful component placing, correct traces routing, appropriate traces widths and
compliance with isolation distances are the major issues.
The main reasons to have a proper PCB routing are:
Provide a noise free path for the signal ground and for the internal references,
ensuring good immunity against switching noises
Minimize the pulsed loops (both primary and secondary) to reduce the
electromagnetic interferences, both radiated and conducted and passing more easily
the EMC regulations.
The below list can be used as guideline when designing a SMPS using VIPer06.
Signal ground routing should be routed separately from power ground and, in general,
from any pulsed high current loop;
Connect all the signal ground traces to the power ground, using a single "star point",
placed close to the IC GND pin;
With flyback topologies, when the auxiliary winding is used, it is suggested to connect
the VDD capacitor on the auxiliary return and then to the main GND using a single
track;
The compensation network should be connected as close as possible to the COMP
pin, maintaining the trace for the GND as short as possible;
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VIPER06
Layout guidelines and design recommendations
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A small bypass capacitor (a few hundreds pF up to 0.1 µF) to GND might be useful to
get a clean bias voltage for the signal part of the IC and protect the IC itself during
EFT/ESD tests. A low ESL ceramic capacitor should be used, placed as close as
possible to the VDD pin;
When using SO16N package it is recommended to connect the pin 4 to GND pin,
using a signal track, in order to improve the noise immunity. This is highly
recommended in case of high nosily environment;
The IC thermal dissipation takes place through the drain pins. An adequate heat sink
copper area has to be designed under the drain pins to improve the thermal
dissipation;
It is not recommended to place large copper areas on the GND pins.
Minimize the area of the pulsed loops (primary, RCD and secondary loops), in order to
reduce its parasitic self- inductance and the radiated electromagnetic field: this will
greatly reduce the electromagnetic interferences produced by the power supply during
the switching.
Figure 30: Suggested routing for converter: flyback case
Figure 31: Suggested routing for converter: buck case
Page 22
Package information
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17 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
17.1 SSO10 package information
Figure 32: SSO10 package outline
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Package information
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Dim.
mm
Min.
Typ.
Max.
A
1.75
A1
0.10
0.25
A2
1.25
b
0.31
0.51
c
0.17
0.25
D
4.80
4.90 5 E
5.80 6 6.20
E1
3.80
3.90 4 e 1 h
0.25
0.50
L
0.40
0.90
K
0°
8°
Table 8: SSO10 package mechanical data
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Package information
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17.2 DIP-7 package information
Figure 33: DIP-7 package outline
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VIPER06
Package information
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Dim.
mm
Notes
Min.
Typ.
Max.
A
5.33
A1
0.38
A2
2.92
3.30
4.95
b
0.36
0.46
0.56
b2
1.14
1.52
1.78
c
0.20
0.25
0.36
D
9.02
9.27
10.16
E
7.62
7.87
8.26
E1
6.10
6.35
7.11
e
2.54
eA
7.62
eB
10.92
L
2.92
3.30
3.81
M
(1)(2)
2.508
6 - 8
N
0.40
0.50
0.60
N1
0.60
O
(2)(3)
0.548
7 - 8
Notes:
(1)
Creepage distance > 800 V.
(2)
Creepage distance as shown in the 664-1 CEI / IEC standard.
(3)
Creepage distance 250 V.
Table 9: DIP-7 package mechanical data
General package performance
The leads size is comprehensive of the thickness of the leads finishing material.
Dimensions do not include mold protrusion, not to exceed 0,25 mm in total (both side).
Package outline exclusive of metal burrs dimensions.
Datum plane “H” coincident with the bottom of lead, where lead exits body.
Ref. POA MOTHER doc. 0037880.
Page 26
Ordering information
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Order code
Package
Packing
VIPER06XN
DIP-7
Tube
VIPER06LN
VIPER06HN
VIPER06XS
SSO10
Tube
VIPER06XSTR
Tape and reel
VIPER06LS
Tube
VIPER06LSTR
Tape and reel
VIPER06HS
Tube
VIPER06HSTR
Tape and reel
18 Ordering information
Table 10: Order codes
Page 27
VIPER06
Revision history
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Date
Revision
Changes
08-Mar-2012
1
Initial release.
01-Feb-2017
2
Modified title in cover page.
Updated Section 4: "Electrical data", Section 4.2: "Thermal data" and
Section 4.3: "Electrical characteristics".
Added Section 16: "Layout guidelines and design recommendations".
Minor text changes.
19 Revision history
Table 11: Document revision history
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