viper20b

Manufacturer Part Numberviper20b
DescriptionSmps Primary I.c.
ManufacturerSTMicroelectronics
viper20b datasheet
 


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T YPE
V
I
DSS
n
VIPer20B/ SP
400V
1.3 A
FEATURE
ADJUSTABLE SWITCHING FREQUENCY UP
TO 200KHZ
CURRENT MODE CONTROL
SOFT START AND SHUT DOWN CONTROL
AUTOMATIC BURST MODE OPERATION IN
STAND-BY CONDITION ABLE TO MEET
”BLUE ANGEL” NORM (1W TOTAL POWER
CONSUMPTION)
INTERNALLY TRIMMED ZENER
REFERENCE
UNDERVOLTAGE LOCK-OUT WITH
HYSTERESIS
INTEGRATED START-UP SUPPLY
AVALANCHE RUGGED
OVERTEMPERATURE PROTECTION
LOW STAND-BY CURRENT
ADJUSTABLE CURRENT LIMITATION
BLOCK DIAGRAM
ON/OFF
UVLO
VDD
LOGIC
+
0.5 V
_
ERROR
AMPLIFIER
_
13 V
+
4.5 V
September 1999
VIPer20BSP
SMPS PRIMARY I.C.
R
DS(on)
8.7
PENTAWATT HV
DESCRIPTION
VIPer20B
combines on the same silicon chip a
state-of-the-art PWM circuit together with an
optimized high voltage avalanche rugged Vertical
Power MOSFET (400V 1.3A).
Typical applications cover off line power supplies
with a secondary max power capability of 30W. It
is compatible from both primary or secondary
regulation loop despite using around 50% less
components when compared with a discrete
solution. Burst mode operation is an additional
feature of this device, offering the possibility to
operate
in
stand-by
components.
OSC
OSCILLATOR
SECURITY
PWM
LATCH
LATCH
S
FF
FF
R/S
Q
R1
Q
S
R2 R3
OVERTEMP.
DETECTOR
0.5V
_
+
+
6 V/A
2 s
300 ns
Blanking
delay
_
CURRENT
AMPLIFIER
COMP
VIPer20B
PRELIMINARY DATA
10
1
Power SO-10
mode
without
extra
DRAIN
SOURCE
1/17

viper20b Summary of contents

  • Page 1

    ... T YPE V I DSS n VIPer20B/ SP 400V 1.3 A FEATURE ADJUSTABLE SWITCHING FREQUENCY UP TO 200KHZ CURRENT MODE CONTROL SOFT START AND SHUT DOWN CONTROL AUTOMATIC BURST MODE OPERATION IN STAND-BY CONDITION ABLE TO MEET ”BLUE ANGEL” NORM (1W TOTAL POWER CONSUMPTION) INTERNALLY TRIMMED ZENER REFERENCE UNDERVOLTAGE LOCK-OUT WITH ...

  • Page 2

    ... VIPer20B / VIPer20BSP ABSOLUTE MAXIMUM RATING Symb ol Parameter V Continuous Drain-Source Voltage ( 125 DS I Maximum Current D V Supply Voltage DD V Voltage Range Input OSC V Voltage Range Input COMP I Maximum Continuous Current COMP V Electrostatic discharge (R = 1.5 K esd I Avalanche Drain-Source Current, Repetitive or Not-Repetitive ...

  • Page 3

    ... V DD transformer design, in order to stuck the output of the transconductance amplifier to the high state. The COMP pin behaves as a constant VIPer20B / VIPer20BSP PowerSO -10 VIPer20BSP current source, and can easily be connected to the output of an optocoupler. Note that any overvoltage due to regulation loop failure is still detected by the error amplifier through the V voltage, which cannot overpass 13V ...

  • Page 4

    ... VIPer20B / VIPer20BSP ELECTRICAL CHARACTERISTICS (T POWER SECTION Symb ol Parameter BV Drain-Source Voltage DSS D I Off-State Drain Current V DSS DS V COMP R Static Drain Source 0.9 A DS( on) D Resistance Fall Time (see fig Rise Time (see fig. 3) ...

  • Page 5

    ... COMPth t Disable Set Up T ime (see fig Ssu T Thermal Shutdown (see fig Temperature T Thermal Shutdown (see fig. 6) hyst Hysteresis VIPer20B / VIPer20BSP Test Cond ition s Min (see fig.1) 12 Output = V DD COMP TBD = 2.5 V (see fig. 1) TBD = -400 A V ...

  • Page 6

    ... VIPer20B / VIPer20BSP Figure 1: V Regulation Point DD I COMP Slope = mA/V COMPHI 0 I COMPLO V DDreg FC00150 Figure 3: Transition Time I D 10% Ipeak FC00160 6/17 Figure 2: Undervoltage Lockout DD0 DDhyst V DDoff I DDch Figure 4: Shut Down Action V OSC V COMP ...

  • Page 7

    ... Figure 5: Start-up Waveforms Figure 6: Overtemperature Protection Tj Ttsd ID VDD VDDon VCOMP VIPer20B / VIPer20BSP Thyst FC10192 7/17 ...

  • Page 8

    ... VIPer20B / VIPer20BSP Figure 7: Oscillator VDD Rt OSC Ct 1 0.9 0.8 0.7 0.6 0 Oscillator frequency vs Rt and Ct 1,000 Ct = 1.5 nF 500 Ct = 2.7 nF 300 Ct = 4.7 nF 200 100 8/17 For R > MAX CLK 550 D 1 MAX R T Recommended D 100KHz: > 80% 200KHz: > 70% FC00050 ...

  • Page 9

    ... RCOMP = 270k 40 RCOMP = 82k RCOMP = 27k RCOMP = 12k 20 0 (20) 0.001 0.01 Figure 9: Error Amplifier Phase Response 200 150 100 50 0 (50) 0.001 0.01 VIPer20B / VIPer20BSP 0 100 Frequency (kHz) RCOMP = + RCOMP = 270k RCOMP = 82k RCOMP = 27k RCOMP = 12k 0 100 Frequency (kHz) FC00200 1,000 FC00210 ...

  • Page 10

    ... VIPer20B / VIPer20BSP Figure 10: Off Line Power Supply With Auxliary Supply Feedback F1 TR2 C1 ACIN R9 R2 OSC 13V C5 Figure 11: Off Line Power Supply With Optocoupler Feedback F1 TR2 VDD OSC 13V C5 10/17 BR1 TR1 VDD DRAIN - VIPer ...

  • Page 11

    ... OPERATION DESCRIPTION : CURRENT MODE TOPOLOGY: The current mode control method, like the one integrated in the VIPer20B uses two control loops - an inner current control loop and an outer loop for voltage control. When the Power MOSFET output transistor is on, the inductor current (primary side of the transformer) is monitored with ...

  • Page 12

    ... The converter enters a endless start up cycle, with a start-up duty cycle defined by the ratio of charging current towards discharging when the VIPer20B tries to start. This ratio is fixed by design 14, which gives a 13% start up duty cycle while the power dissipation at start up is approximately 1W, for a 230 Vrms input voltage ...

  • Page 13

    ... This last equation shows that the open loop gain A can be related to G and Z : VOL m COMP VOL m COMP where G value for VIPer20B is 1.5 mA/V m typically well defined by specification, but Z m Figure 13: Mixed Soft Start and Compensation D2 D3 VIPer VDD DRAIN - OSC R3 ...

  • Page 14

    ... VIPer20B / VIPer20BSP schematic to be adapted depending the specific needs. If the proposed schematic is used, the pulse duration must be kept at a low value (500ns is sufficient) for minimizing consumption. The optocoupler must be able to provide 20mA through the optotransistor. PRIMARY PEAK CURRENT LIMITATION The primary I ...

  • Page 15

    ... C 1.17 D 2.40 E 0.35 F 0.60 G1 4.90 G2 7. 10.05 L 16.60 L1 14.60 L2 21.20 L3 22.20 L5 2.60 L6 15.10 L7 6.00 M 2.50 M1 7. Diam. 3. VIPer20B / VIPer20BSP inch MAX. MIN. TYP. 4.80 0.169 1.37 0.046 2.80 0.094 0.55 0.014 0.80 0.024 5.28 0.193 7.82 0.292 9.70 0.366 10.40 10.40 0.396 17.30 0.653 15.22 0.575 21.85 0.835 22.82 0.874 3.00 0.102 15.80 0.594 6.60 0.236 3.10 0.098 8.16 0.298 0.020 90 3.90 0.146 L L1 ...

  • Page 16

    ... VIPer20B / VIPer20BSP PowerSO-10 MECHANICAL DATA mm DIM. MIN. TYP. A 3.35 A1 0.00 B 0.40 C 0.35 D 9.40 D1 7.40 e 1.27 E 9.30 E1 7.20 E2 7.20 E3 6.10 E4 5.90 F 1.25 h 0.50 H 13.80 L 1. 16/17 inch MAX. MIN. TYP. 3.65 0.132 0.10 0.000 0.60 0.016 0.55 0.013 9.60 0.370 7.60 0.291 0.050 9.50 0.366 7.40 0.283 7.60 0.283 6.35 0.240 6.10 0.232 1 ...

  • Page 17

    ... The ST logo is a trademark of STMicroelectronics 1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. VIPer20B / VIPer20BSP http://www.st.com . 17/17 ...