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VIPER15
User Manual
40 pgs1.83 Mb0
Table of contents
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ST VIPER15 User Manual

Features
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■ 800 V avalanche rugged power section
■ Quasi-resonant (QR) control for valley
■ 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
VIPER15
Off-line high voltage converters
SO16 narrow
-
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 quasi­resonant feature reduces EMI filter cost. Brown­out 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

DIP-7

Table 1. Device summary

VIPER15HDTR / VIPER15LDTR Tape and reel
August 2010 Doc ID 15455 Rev 5 1/40
Order codes Package Packaging
VIPER15LN / VIPER15HN DIP-7 Tube
VIPER15HD / VIPER15LD
SO16 narrow
Tube
www.st.com
40
Contents VIPER15
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Typical circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.1 Power section and gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 High voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.3 Power-up description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.4 Power-down description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.5 Auto-restart description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.6 Quasi-resonant operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.7 Frequency foldback function and valley skipping mode . . . . . . . . . . . . . . 22
7.8 Double blanking time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.9 Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.10 Current limit set point and feed-forward option . . . . . . . . . . . . . . . . . . . . . 24
7.11 Overvoltage protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.12 Summary on ZCD pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.13 Feedback and overload protection (OLP) . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.14 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 32
7.15 Brown-out protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.16 2nd level overcurrent protection and hiccup mode . . . . . . . . . . . . . . . . . . 34
2/40 Doc ID 15455 Rev 5
VIPER15 Contents
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Doc ID 15455 Rev 5 3/40
Block diagram VIPER15

1 Block diagram

Figure 2. Block diagram

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2 Typical power

Table 2. Typical power

Part number
VIPER15 9 W 10 W 5 W 6 W
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.
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Adapter
(1)
230 V
AC
Open frame
(2)
Adapter
85-265 V
(1)
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AC
Open frame
(2)
4/40 Doc ID 15455 Rev 5
VIPER15 Pin settings

3 Pin settings

Figure 3. Connection diagram (top view)

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Note: The copper area for heat dissipation has to be designed under the DRAIN pins.

Table 3. Pin description

Pin n.
Name Function
DIP-7 SO16
1 1...2 GND This pin represents the device ground and the source of the power section.
-4N.A.
25VDD
Not available for user. It can be connected to GND (pins 1-2) or left not connected.
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. R
LIM
, RFF, R
OVP
and D
, Figure 32)
OVP
2. User defined drain current limit set-point and voltage feed forward.The resistor, R I
36ZCD
ZCD
3. The resistor R
and then it limits the static maximum drain current.
, connected between ZCD pin and GND causes the current
LIM
, between ZCD pin and the auxiliary winding, performs
FF
the feed-forward operation and then the drain current limitation changes according to the converter input voltage.
4. Output overvoltage protection. A voltage exceeding V
threshold,
OVP
(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
47FB
current for loop regulation. A voltage below the threshold V the burst-mode operation. A level close to the threshold V
FBbm
means that
FBlin
activates
we are approaching the cycle-by-cycle overcurrent set point.
Brownout protection input with hysteresis. A voltage below the threshold
shuts down (not latch) the device and lowers the power consumption.
V
58BR
BRth
Device operation restarts as the voltage exceeds the threshold V
. It can be connected to ground when not used.
V
BRhyst
BRth
+
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 15455 Rev 5 5/40
Electrical data VIPER15

4 Electrical data

4.1 Maximum ratings

Table 4. Absolute maximum ratings

Symbol
V
DRAIN
E
AV
I
AR
I
DRAIN
V
ZCD
V
FB
V
BR
V
DD
I
DD
P
TOT
T
J
T
STG
Pin
(DIP7)
Parameter
Val ue
Min. Max.
7, 8 Drain-to-source (ground) voltage 800 V
Repetitive avalanche energy
7, 8
(limited by T
Repetitive avalanche current
7, 8
(limited by T
= 150 °C)
J
= 150 °C)
J
2mJ
1A
7, 8 Pulse drain current (limited by TJ = 150 °C) 2.5 A
3 Control input pin voltage (with I
= 1 mA) -0.3 Self limited V
ZCD
4 Feedback voltage -0.3 5.5 V
5 Brown-out input pin voltage (with IBR = 0.5 mA) -0.3 Self limited V
2 Supply voltage (IDD = 25 mA) -0.3 Self limited V
2 Input current 25 mA
Power dissipation at TA < 40 °C (DIP-7) 1 W
Power dissipation at T
< 60 °C (SO16N) 1 W
A
Operating junction temperature range -40 150 °C
Storage temperature -55 150 °C
Unit

4.2 Thermal data

Table 5. Thermal data

Symbol Parameter
R
R
R
1. When mounted on a standard single side FR4 board with 100 mm2 (0.155 sq in) of Cu (35 μm thick)
6/40 Doc ID 15455 Rev 5
Thermal resistance junction pin
thJP
(Dissipated power = 1 W)
Thermal resistance junction ambient
thJA
(Dissipated power = 1 W)
Thermal resistance junction ambient
thJA
(Dissipated power = 1 W)
(1)
Max. value
SO16N
Max. value
DIP7
35 40 °C/W
90 110 °C/W
80 90 °C/W
Unit
VIPER15 Electrical data

4.3 Electrical characteristics

(TJ = -25 to 125 °C, VDD = 14 V

Table 6. Power section

Symbol Parameter Test condition Min. Typ. Max. Unit
V
BVDSS
I
OFF
R
DS(on)
C
OSS

Table 7. Supply section

Symbol Parameter Test condition Min. Typ. Max. Unit
Break-down voltage
OFF state drain current
Drain-source on state resistance
Effective (energy related) output capacitance
(a)
; unless otherwise specified)
I
= 1 mA, VFB = GND
DRAIN
TJ = 25 °C
V
V
I
= max rating,
DRAIN
= GND
FB
= 0.2 A, VFB = 3 V,
DRAIN
VBR = GND, TJ = 25 °C
I
= 0.2 A, VFB = 3 V ,
DRAIN
VBR = GND, TJ = 125 °C
= 0 to 640 V 10 pF
V
DRAIN
800 V
60 μA
20 24 Ω
40 48 Ω
Volt ag e
V
DRAIN
Drain-source start voltage 60 80 100 V
_START
= 120 V,
V
DRAIN
VBR = GND, VFB = GND,
-2 -3 -4 mA
VDD = 4 V
I
DDch
V
DD
V
DDclamp
V
DDon
V
DDoff
V
DD(RESTART)
Start-up charging current
V
= 120 V,
DRAIN
VBR = GND, VFB = GND,
= 4 V after fault.
V
DD
-0.4 -0.6 -0.8 mA
Operating voltage range After turn-on 8.5 23.5 V
VDD clamp voltage IDD = 20 mA 23.5 V
VDD start-up threshold
VDD under voltage shutdown threshold
VDD restart voltage threshold
V
V
V
V
= 120 V,
DRAIN
= GND, VFB = GND
BR
= 120 V,
DRAIN
= GND, VFB = GND
BR
13 14 15 V
7.588.5V
44.55 V
Current
I
DD0
I
DD1
I
DD_FAULT
I
DD_OFF
Operating supply current, not switching
Operating supply current, switching
Operating supply current, with protection tripping
Operating supply current with V
DD
< V
DDoff
VFB = GND, FSW = 0 k H z , VBR = GND, VDD = 10 V
V
= 120 V, 2.5 mA
DRAIN
0.9 mA
400 μA
VDD = 7 V 270 μA
a. Adjust VDD above V
start-up threshold before settings to 14 V.
DDon
Doc ID 15455 Rev 5 7/40
Electrical data VIPER15

Table 8. Controller section

Symbol Parameter Test condition Min. Typ. Max. Unit
Feedback pin
V
FBolp
V
FBlin
V
FBbm
V
FBbmhys
I
FB
R
FB(DYN)
H
FB
Overload shutdown threshold 4.5 4.8 5.2 V
Linear dynamics upper limit 3.2 3.3 3.4 V
Burst mode threshold Voltage falling 0.4 0.45 0.5 V
Burst mode hysteresis Voltage rising 50 mV
Feedback sourced current
Dynamic resistance V
ΔVFB / ΔI
ZCD pin
V
ZCDCLh
V
ZCDAth
V
ZCDTth
I
ZCD
T
BLANK
Upper clamp voltage I
Arming voltage threshold Positive-going edge 0.8 V
Triggering voltage threshold Negative-going edge 0.6 V
Internal pull-up -2 µA
Turn-on inhibit time after MOSFET’s turn-off
Current limitation
I
Dlim
Max drain current limitation
V
= 0.3 V -150 -200 -280 uA
FB
3.3 V < V
FB
D
ZCD
V
ZCD
V
ZCD
< 4.8 V -3 uA
FB
< 3.3 V 14 19 kΩ
26V/A
= 1 mA 5 5.5 6 V
< 1 V 6.3 µs
>1 V 2.5 µs
VFB = 4 V, I
= -10 µA
ZCD
0.38 0.4 0.42 A
TJ = 25 °C
t
SS
t
SU
T
ON_MIN
Soft start time
Start up time
Minimum turn ON time 220 400 480 ns
td Propagation delay 100 ns
t
LEB
I
D_BM
Overcurrent protection (2
I
DMAX
Overvoltage protection
V
OVP
T
STROBE
Leading edge blanking 300 ns
Peak drain current during burst mode
nd
OCP)
Second overcurrent threshold 0.6 A
Overvoltage protection threshold
Overvoltage protection strobe time
8/40 Doc ID 15455 Rev 5
VIPER15L 3.5 ms
VIPER15H 4.2 ms
VIPER15L 7.5 15 ms
VIPER15H 9.5 18 ms
V
= 0.6 V 90 mA
FB
3.8 4.2 4.6 V
2.2 μs
VIPER15 Electrical data
Table 8. Controller section (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Oscillator section
F
OSClim
F
STARTER
F
OSCmin
Internal frequency limit VIPER15H 200 225 250 kHz
Starter frequency
Brown-out protection
Internal frequency limit VIPER15L 122 136 150 kHz
V
BRth
V
BRhyst
I
BRhyst
V
BRclamp
V
DIS
Brown-out threshold Voltage falling 0.41 0.45 0.49 V
Voltage hysteresis above V
BRth
Current hysteresis 7 12 μA
Clamp voltage IBR = 250 µA 3 V
Brown-out disable voltage 50 150 mV
Thermal shutdown
T
SD
Thermal shutdown temperature
=1 V,
V
FB
V
ZCD<VZCDT th
t<tSU
VFB=1 V, V
ZCD<VZCDT th
t>tSU
VFB = 1 V, V
ZCD>VZCDA_th
1/4
F
OSClim
1/8
F
OSClim
1/64
F
OSClim
kHz
kHz
kHz
Violate rising 50 mV
150 160 °C
T
HYST
Thermal shutdown hysteresis 30 °C
Doc ID 15455 Rev 5 9/40
Electrical data VIPER15

Figure 4. Minimum turn-on time test circuit

V
DRAIN
GND
14 V
3.5 V
VDD
ZCD
FB
DRAIN
DRAIN
50 Ω
BR
30 V
90 %
10 %
I
Dlim
I
DRAIN
T
ONmin
Time
Time

Figure 5. Brown-out threshold test circuits

V
BRth+VBRhyst
V
BRth
V
I
BRhyst
DIS
I
DRAIN
BR
I
BR
Time
Time
14 V
GND
VDD
ZCD
FB
DRAIN
DRAIN
I
BRhyst
BR
10 kΩ
V
30 V
2 V
Note: Adjust V

Figure 6. OVP threshold test circuits

GND
DRAIN
VDD
DRAIN
14 V
above V
DD
start-up threshold before settings to 14 V
DDon
2 V
ZCD
FB
BR
10 kΩ
30 V
Time
V
ZCD
V
OVP
V
DRAIN
Time
Time
10/40 Doc ID 15455 Rev 5
VIPER15 Typical electrical characteristics

5 Typical electrical characteristics

Figure 7. Current limit vs TJ Figure 8. Drain start voltage vs T
J
Figure 9. HFB vs T
Figure 11. Brown-out hysteresis vs T
J
J
Figure 10. Brown-out threshold vs T
J
Figure 12. Brown-out hysteresis current
vs T
J
Doc ID 15455 Rev 5 11/40
Typical electrical characteristics VIPER15
Figure 13. Operating supply current
(no switching) vs T
J
Figure 14. Operating supply current
(switching) vs T
J
Figure 15. V
V
(mV )
ZCD
500
450
400
350
300
0.0 50.0 100.0 150.0 200.0 250.0
ZCD
vs I
I
ZCD
ZCD
(μA)
Figure 17. Power MOSFET on-resistance
vs T
J
Figure 16. Current limit vs I
ZCD
Figure 18. Power MOSFET break down
voltage vs T
J
12/40 Doc ID 15455 Rev 5
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