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(R)
VIPER20B VIPER20BSP
SMPS PRIMARY I.C.
PRELIMINARY DATA
T YPE VIPER20B/ SP
V DSS 400V
In 1.3 A
R DS(on) 8.7
10
1
FEATURE s ADJUSTABLE SWITCHING FREQUENCY UP TO 200KHZ s CURRENT MODE CONTROL s SOFT START AND SHUT DOWN CONTROL s AUTOMATIC BURST MODE OPERATION IN STAND-BY CONDITION ABLE TO MEET "BLUE ANGEL" NORM (1W TOTAL POWER CONSUMPTION) s INTERNALLY TRIMMED ZENER REFERENCE s UNDERVOLTAGE LOCK-OUT WITH HYSTERESIS s INTEGRATED START-UP SUPPLY s AVALANCHE RUGGED s OVERTEMPERATURE PROTECTION s LOW STAND-BY CURRENT s ADJUSTABLE CURRENT LIMITATION BLOCK DIAGRAM
PENTAWATT HV
Power SO-10
DESCRIPTION VIPER20BTM 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 mode without extra components.
OSC
DRAIN
ON/OFF OSCILLATOR
SECURITY LATCH VDD UVLO LOGIC R/S FF S Q
PWM LATCH R1 S FF R2 R3 Q
OVERTEMP. DETECTOR
0.5 V
+ _
2 s delay
300 ns Blanking
+ _
+
0.5V _ 6 V/A
_ 13 V +
ERROR AMPLIFIER
CURRENT AMPLIFIER
4.5 V
COMP
SOURCE
FC00490
September 1999
1/17
VIPER20B / VIPER20BSP
ABSOLUTE MAXIMUM RATING
Symb ol V DS ID VDD V OSC V COMP I COMP V esd I D(AR) P tot Tj T s tg Parameter o Continuous Drain-Source Voltage (T j = 25 to 125 C) Maximum Current Supply Voltage Voltage Range Input Voltage Range Input Maximum Continuous Current Electrostatic discharge (R = 1.5 K C = 100pF) Avalanche Drain-Source Current, Repetitive or Not-Repetitive (T C = 100 o C, Pulse W idth Limited by T J max, <1%) o Power Dissipation at Tc = 25 C Junction Operating Temperature Storage Temperature Value -0.3 to 400 Internally Limited 0 to 15 0 to V DD 0 to 5 2 2000 T BD 57 -40 to 140 -65 to 150 Unit V A V V V mA V A W C o C
o
THERMAL DATA
R t hj-ca se R th j-a mb. Thermal Resistance Junction-case Thermal Resistance Junction-ambient Max Max 2.0 70
o o
C/W C/W
CONNECTION DIAGRAMS (Top View) PENTAWATT HV PowerSO-10
CURRENT AND VOLTAGE CONVENTIONS
IDD ID
VD D
DR AIN
IOSC
OSC
13V
+
COMP SOURCE
VDD
VDS
ICOMP VOSC VCOMP
FC00020
2/17
VIPER20B / VIPER20BSP
ORDERING NUMBERS
PENT AW ATT HV VIPER20B PowerSO -10 VIPER20BSP
PINS FUNCTIONAL DESCRIPTION DRAIN PIN: Integrated power MOSFET drain pin. It provides internal bias current during start-up via an integrated high voltage current source which is switched off during normal operation. The device is able to handle an unclamped current during its normal operation, assuring self protection against voltage surges, PCB stray inductance, and allowing a snubberless operation for low output power. SOURCE PIN: Power MOSFET source pin. Primary side circuit common ground connection. VDD PIN : This pin provides two functions :
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 VDD voltage, which cannot overpass 13V. The output voltage will be somewhat higher than the nominal one, but still under control. COMP PIN : This pin provides two functions :
- It is the output of the error transconductance
amplifier, and allows for the connection of a compensation network to provide the desired transfer function of the regulation loop. Its bandwidth can be easily adjusted to the needed value with usual components value. As stated above, secondary regulation configurations are also implemented through the COMP pin.
- It corresponds to the low voltage supply of the
control part of the circuit. If VDD goes below 8V, the start-up current source is activated and the output power MOSFET is switched off until the VDD voltage reaches 11V. During this phase, the internal current consumption is reduced, the VDD pin is sourcing a current of about 1mA and the COMP pin is shorted to ground. After that, the current source is shut down, and the device tries to start up by switching again.
- When the COMP voltage is going below 0.5V,
the shut-down of the circuit occurs, with a zero duty cycle for the power MOSFET. This feature can be used to switch off the converter, and is automatically activated by the regulation loop (whatever is the configuration) to provide a burst mode operation in case of negligible output power or open load condition. OSC PIN : An RT-CT network must be connected on that pin to define the switching frequency. Note that despite the connection of RT to VDD, no significant frequency change occurs for VDD varying from 8V to 15V. It provides also a synchronisation capability, when connected to an external frequency source.
- This pin is also connected to the error amplifier,
in order to allow primary as well as secondary regulation configurations. In case of primary regulation, an internal 13V trimmed reference voltage is used to maintain VDD at 13V. For secondary regulation, a voltage between 8.5V and 12.5V will be put on VDD pin by transformer design, in order to stuck the output of the transconductance amplifier to the high state. The COMP pin behaves as a constant
3/17
VIPER20B / VIPER20BSP
ELECTRICAL CHARACTERISTICS (TJ = 25 oC, VDD = 13 V, unless otherwise specified) POWER SECTION
Symb ol BV DSS I DSS R DS( on) tf tr C OSS Parameter Drain-Source Voltage Test Cond ition s I D = 10 mA V COMP = 0 V TJ = 125 C 7.3 80 50 90
o
Min. 400
Typ .
Max.
Un it V
Off-State Drain Current V DS = 300 V V COMP = 0 V Static Drain Source on Resistance Fall Time Rise Time Output Capacitance I D = 0.9 A I D = 0.9 A I D = 0.1 A (see fig. 3) I D = 0.9 A (see fig. 3) V DS = 25 V
0.6 8.7 15.7
mA ns ns pF
TJ= 100 C Vin = 300 V (1) V i n = 300 V (1)
o
(1) On Inductive Load, Clamped.
SUPPLY SECTION
Symb ol I DDch I DD0 I DD1 I DD2 V DDo ff V DDo n VDDhyst Parameter Start-up Charging Current Operating Supply Current Operating Supply Current Operating Supply Current Undervoltage Shutdown Undervoltage Reset Hysteresis Start-up Test Cond ition s V DD = 0 to VDDon (see fig. 2) V DS = 70 V Min. Typ . -2 12 13 14 8 11 2.4 3 12 T BD Max. Un it mA mA mA mA V V V
V DD = 12 V, F SW = 0 KHz (see fig. 2) V DD = 12 V, F SW = 100 KHz V DD = 12 V, F SW = 200 KHz (see fig. 2) (see fig. 2) (see fig. 2)
OSCILLATOR SECTION
Symb ol F SW1 F SW2 V OSCih V OSCi l Parameter Oscillator Frequency Initial Accuracy Oscillator Frequency Total Variation Oscillator Peak Voltage Oscillator Valley Voltage Test Cond ition s R T = 8.2 K (see fig.7) C T =2.4 nF Min. 90 80 Typ . 100 100 7.1 3.7 Max. 110 120 Un it KHz KHz V V
C T =2.4 nF R T = 8.2 K V DD = 9 to15 V TJ = 0 to 100 o C
4/17
VIPER20B / VIPER20BSP
ELECTRICAL CHARACTERISTICS (continued) ERROR AMPLIFIER SECTION
Symb ol V DDreg V DDreg GBW A VOL Gm V COMPL O V COMPHI I COMPLO I COMPHI Parameter VDD Regulation Point Total Variation Unity G ain Bandwidth Open Loop Voltage Gain DC T ransconductance Output Low Level Output High Level Output Low Current Capability Output High Current Capability Test Cond ition s I COMP = 0 mA
o
Min. 12.6
Typ . 13 2 150
Max. 13.4
Un it V % KHz dB
(see fig.1)
T J = 0 to 100 C From Input = VDD to Output = V COMP CO MP pin is open (see fig. 8) CO MP pin is open (see fig. 8) V COMP = 2.5 V I COMP = -400 A I COMP = 400 A V COMP = 2.5 V V COMP = 2.5 V (see fig. 1) V DD = 14 V V DD = 12 V V DD = 14 V V DD = 12 V TBD TBD
50 1.5 0.2 4.5 -600 600 T BD
mA/V V V A A
PWM COMPARATOR SECTION
Symb ol H ID V COMPof f I Dpeak td tb Parameter V COMP /IDpea k V COMP offset Test Cond ition s V COMP = 1 to 3 V I Dp eak = 10 mA COMP pin open 1.3 250 300 Min. TBD Typ . 2.3 0.5 T BD Max. T BD Un it V/A V A ns ns
Peak Current Limitation V DD = 12 V Current Sense Delay to turn-off Blanking Time I D = 0.4 A
SHUTDOWN AND OVERTEMPERATURE SECTION
Symb ol V COMPth t DI Ssu T t sd T hyst Parameter Restart threshold Disable Set Up T ime Thermal Shutdown Temperature Thermal Shutdown Hysteresis Test Cond ition s (see fig. 4) (see fig. 4) (see fig. 6) (see fig. 6) 140 Min. Typ . 0.5 1.7 160 34 5 Max. Un it V s
o
C C
o
5/17
VIPER20B / VIPER20BSP
Figure 1: VDD Regulation Point Figure 2: Undervoltage Lockout
ICOMP
ICOMPHI
Slope = Gm in mA/V
IDD
IDD0
VDD
0 ICOMPLO VDDreg
FC00150
VDDhyst VDDoff IDDch
VDS = 70 V Fsw = 0
VDDon
VDD
FC00170
Figure 3: Transition Time
Figure 4: Shut Down Action
VOSC
ID
t
10% Ipeak
VCOMP
t VCOMPth tDISsu
VDS
90% VD
t
ID
10% VD t tf tr
ENABLE
t
ENABLE DISABLE
FC00060
FC00160
6/17
VIPER20B / VIPER20BSP
Figure 5: Start-up Waveforms
Figure 6: Overtemperature Protection
Ttsd Tj Thyst
t ID
t VDD VDDon
t VCOMP
t
FC10192
7/17
VIPER20B / VIPER20BSP
Figure 7: Oscillator
Rt OSC
VDD
For RT > 1.2 K: 2.3 FSW = D RT CT MAX
CLK
Ct
~360
DMAX = 1 -
550 RT - 150
Recommended DMAX values: 100KHz: > 80% 200KHz: > 70%
FC00050
Maximum duty cycle vs Rt
1
FC00040
0.9
0.8
Dmax
0.7
0.6
0.5
1
2
3
5
10
20
30
50
Rt (k) Oscillator frequency vs Rt and Ct
1,000
Ct = 1.5 nF
FC00030
500
Ct = 2.7 nF
Frequency (kHz)
300 200
Ct = 4.7 nF
Ct = 10 nF
100
50 30
1
2
3
5
10
20
30
50
Rt (k)
8/17
VIPER20B / VIPER20BSP
Figure 8: Error Amplifier Frequency Response
FC00200
60
RCOMP = + RCOMP = 270k
Voltage Gain (dB)
40
RCOMP = 82k RCOMP = 27k
20
RCOMP = 12k
0
(20) 0.001
0.01
0.1 1 10 Frequency (kHz)
100
1,000
Figure 9: Error Amplifier Phase Response
FC00210
200
RCOMP = +
150 Phase () 100 50 0 (50) 0.001
RCOMP = 270k RCOMP = 82k RCOMP = 27k RCOMP = 12k
0.01
0.1 1 10 Frequency (kHz)
100
1,000
9/17
VIPER20B / VIPER20BSP
Figure 10: Off Line Power Supply With Auxliary Supply Feedback
F1 C1
ACIN
TR2
BR1 TR1 D1 C2 R1 C3 D3 C1 0 R7 C4
GND
D2
L2
+Vcc
R9
C7
C9
R2
VDD
DRAIN
OSC
13V
C5
+
COMP SOURCE
C6
C11
VIPer
R3
FC00402
Figure 11: Off Line Power Supply With Optocoupler Feedback
F1 TR2 BR1 TR1 D1 C2 R1 C3 D3 C1 0 R7 C4 GND C7 C9 D2 L2 +Vcc
C1 AC IN R9
R2
VDD
DRAIN
OSC
13V
C5
+
COMP SOURCE
VIPer
C11
C6 R3 ISO1
R6
R4 C8 U2 R5
FC 00412
10/17
VIPER20B / VIPER20BSP
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 a SenseFET technique and converted into a voltage VS proportional to this current. When VS reaches VCOMP (the amplified output voltage error) the power switch is switched off. Thus, the outer voltage control loop defines the level at which the inner loop regulates peak current through the power switch and the primary winding of the transformer. Excellent open loop D.C. and dynamic line regulation is ensured due to the inherent input voltage feedforward characteristic of the current mode control. This results in an improved line regulation, instantaneous correction to line changes and better stability for the voltage regulation loop. Current mode topology also ensures good limitation in the case of short circuit. During a first phase the output current increases slowly following the dynamic of the regulation loop. Then it reaches the maximum limitation current internally set and finally stops because the power supply on VDD is no longer correct. For specific applications the maximum peak current internally set can be overridden by externally limiting the voltage excursion on the COMP pin. An integrated blanking filter inhibits the PWM comparator output for a short time after the integrated Power MOSFET is switched on. This function prevents anomalous or premature termination of the switching pulse in the case of current spikes caused by primary side capacitance or secondary side rectifier reverse recovery time. STAND-BY MODE Stand-by operation in nearly open load condition automatically leads to a burst mode operation allowing voltage regulation on the secondary side. The transition from normal operation to burst mode operation happens for a power PSTBY given by : 1 2 PSTBY = LP ISTBY FSW 2 Where: LP is the primary inductance of the transformer. FSW is the normal switching frequency. ISTBY is the minimum controllable current, corresponding to the minimum on time that the device is able to provide in normal operation. This current can be computed as : (tb + td) VIN ISTBY =
LP
tb + td is the sum of the blanking time and of the propagation time of the internal current sense and comparator, and represents roughly the minimum on time of the device. Note that PSTBY may be affected by the efficiency of the converter at low load, and must include the power drawn on the primary auxiliary voltage. As soon as the power goes below this limit, the auxiliary secondary voltage starts to increase above the 13V regulation level forcing the output voltage of the transconductance amplifier to low state (VCOMP < VCOMPth). This situation leads to the shutdown mode where the power switch is maintained in the off state, resulting in missing cycles and zero duty cycle. As soon as VDD gets back to the regulation level and the VCOMPth threshold is reached, the device operates again. The above cycle repeats indefinitely, providing a burst mode of which the effective duty cycle is much lower than the minimum one when in normal operation. The equivalent switching frequency is also lower than the normal one, leading to a reduced consumption on the input mains lines. This mode of operation allows the VIPER20B to meet the new German "Blue Angel" Norm with 1W total power consumption for the system when working in stand-by. The output voltage remains regulated around the normal level, with a low frequency ripple corresponding to the burst mode. The amplitude of this ripple is low, because of the output capacitors and of the low output current drawn in such conditions.The normal operation resumes automatically when the power get back to higher levels than PSTBY. HIGH VOLTAGE START-UP CURRENT SOURCE An integrated high voltage current source provides a bias current from the DRAIN pin during the start-up phase. This current is partially absorbed by internal control circuits which are placed into a standby mode with reduced
11/17
VIPER20B / VIPER20BSP
consumption and also provided to the external capacitor connected to the VDD pin. As soon as the voltage on this pin reaches the high voltage threshold VDDon of the UVLO logic, the device turns into active mode and starts switching. The start up current generator is switched off, and the converter should normally provide the needed current on the VDD pin through the auxiliary winding of the transformer, as shown on figure 12. In case of abnormal condition where the auxiliary winding is unable to provide the low voltage supply current to the VDD pin (i.e. short circuit on the output of the converter), the external capacitor discharges itself down to the low threshold voltage VDDoff of the UVLO logic, and the device get back to the inactive state where the internal circuits are in standby mode and the start up current source is activated. 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 to 2 to 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. This low value of start-up duty cycle prevents the stress of the output rectifiers and of the transformer when in short circuit. The external capacitor CVDD on the VDD pin must be sized according to the time needed by the converter to start up, when the device starts switching. This time tSS depends on many parameters, among which transformer design, output capacitors, soft start feature and compensation network implemented on the COMP pin. The following formula can be used for defining the minimum capacitor needed: IDD tSS CVDD >
VDDhyst
where: IDD is the consumption current on the VDD pin when switching. Refer to specified IDD1 and IDD2 values. tSS is the start up time of the converter when the device begins to switch. Worst case is generally at full load. VDDhyst is the voltage hysteresis of the UVLO logic. Refer to the minimum specified value. Soft start feature can be implemented on the COMP pin through a simple capacitor which will be also used as the compensation network. In this case, the regulation loop bandwidth is rather low, because of the large value of this capacitor. In case a large regulation loop bandwidth is mandatory, the schematics of figure 13 can be used. It mixes a high performance compensation
Figure 12: Behaviour of the high voltage current source at start-up
VDD VDDo n VDDoff
2 mA 15 mA CVDD
VDD
1 mA 15 mA
3 mA
DRAIN
Ref. t Auxiliary primary wind in g UNDERVOLTAGE LOCK OUT LOGIC
VIPer
SOUR CE
Start up dut y cycle ~ 10 %
FC00422
12/17
VIPER20B / VIPER20BSP
network together with a separate high value soft start capacitor. Both soft start time and regulation loop bandwidth can be adjusted separately. If the device is intentionally shut down by putting the COMP pin to ground, the device is also performing start-up cycles, and the VDD voltage is oscillating between VDDon and VDDoff. This voltage can be used for supplying external functions, provided that their consumption doesn't exceed 0.5mA. Figure 14 shows a typical application of this function, with a latched shut down. Once the "Shutdown" signal has been activated, the device remains in the off state until the input voltage is removed. TRANSCONDUCTANCE ERROR AMPLIFIER The VIPer30B includes a transconductance error amplifier. Transconductance Gm is the change in output current (ICOMP) versus change in input voltage (VDD). Thus: ICOMP Gm = VDD The output impedance ZCOMP at the output of this amplifier (COMP pin) can be defined as: VCOMP VCOMP 1 ZCOMP = = x ICOMP Gm VDD This last equation shows that the open loop gain AVOL can be related to Gm and Z COMP: AVOL = Gm x ZCOMP where Gm value for VIPER20B is 1.5 mA/V typically. Gm is well defined by specification, but ZCOMP and therefore AVOL are subject to large tolerances. An impedance Z can be connected between the COMP pin and ground in order to define more accurately the transfer function F of the error amplifier, according to the following equation, very similar to the one above: F(S) = Gm x Z(S) The error amplifier frequency response is reported in figure 8 for different values of a simple resistance connected on the COMP pin. The unloaded transconductance error amplifier shows an internal ZCOMP of about 330 K. More complex impedance can be connected on the COMP pin to achieve different compensation laws. A capacitor will provide an integrator function, thus eliminating the DC static error, and a resistance in series leads to a flat gain at higher frequency, insuring a correct phase margin. This configuration is illustrated on figure 15. As shown in figure 15 an additional noise filtering capacitor of 2.2 nF is generally needed to avoid any high frequency interference. It can be also interesting to implement a slope compensation when working in continuous mode with duty cycle higher than 50%. Figure 16 shows such a configuration. Note that R1 and C2 build the classical compensation network, and Q1 is injecting the slope compensation with the correct polarity from the oscillator sawtooth. EXTERNAL CLOCK SYNCHRONIZATION: The OSC pin provides a synchronisation capability, when connected to an external frequency source. Figure 17 shows one possible Figure 14: Latched Shut Down
Figure 13: Mixed Soft Start and Compensation
D2
VIPer
VDD DRAIN
D3
R1
VDD
VIPer
DRAIN
OSC 13V
+
COMP SO URCE
R3 D1
Q2
OSC
13V
+
COMP SOURCE
AUXILI ARY WINDING
R3
R2
C4
R1 R2
R4
Shutdown
+ C3
C1
+ C2
Q1
D1
FC00432
FC00442
13/17
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 IDPEAK current and, as resulting effect, the output power can be limited using the simple circuit shown in figure 18. The circuit based on Q1, R1 and R2 clamps the voltage on the COMP pin in order to limit the primary peak current of the device to a value: VCOMP - 0.5 IDPEAK = HID where: VCOMP = 0.6 x R1 + R2
R2
The suggested value for R1+R2 is in the range of 220K. OVER-TEMPERATURE PROTECTION: Over-temperature protection is based on chip temperature sensing. The minimum junction temperature at which over-temperature cut-out occurs is 140oC while the typical value is 160oC. The device is automatically restarted when the junction temperature decreases to the restart temperature threshold that is typically 34oC below the shutdown value (see figure 6).
Figure 15: Typical Compensation Network
Figure 16: Slope Compensation
VIPer
VDD OSC 13V DRAIN
R2
R1 VIPe r
VDD DRAIN
+
COMP SOURCE
OSC 13V
+
COMP SOURCE
C2
R1 C1
Q1
C2
C3
C1
R3
F C00452
FC00462
Figure 17:External Clock Synchronization
Figure 18:Current Limitation Circuit Example
VIPer
VDD OSC DRAIN
13V
VIPer
VDD DRAIN
+
COMP SOURCE
OSC
13V
+
COMP SOURCE
R1 Q1 R2
10 k
FC00 472
FC 00 482
14/17
VIPER20B / VIPER20BSP
PENTAWATT HV (VERTICAL) MECHANICAL DATA
DIM. A C D E F G1 G2 H1 H2 H3 L L1 L2 L3 L5 L6 L7 M M1 R V4 Diam. mm TYP. inch TYP.
MIN. 4.30 1.17 2.40 0.35 0.60 4.90 7.42 9.30 10.05 16.60 14.60 21.20 22.20 2.60 15.10 6.00 2.50 7.56
MAX. 4.80 1.37 2.80 0.55 0.80 5.28 7.82 9.70 10.40 10.40 17.30 15.22 21.85 22.82 3.00 15.80 6.60 3.10 8.16
MIN. 0.169 0.046 0.094 0.014 0.024 0.193 0.292 0.366 0.396 0.653 0.575 0.835 0.874 0.102 0.594 0.236 0.098 0.298
MAX. 0.189 0.054 0.110 0.022 0.031 0.208 0.308 0.382 0.409 0.409 0.681 0.599 0.860 0.898 0.118 0.622 0.260 0.122 0.321
0.50 90o 3.70 3.90 0.146
0.020 90 0.154
L E L1
M1 M R
Resin between leads
A
D
C
L6 L7 V4
G2
G1 F L2 L3 L5
H1
H3 Diam
H2
P023H3
15/17
VIPER20B / VIPER20BSP
PowerSO-10 MECHANICAL DATA
DIM. A A1 B C D D1 e E E1 E2 E3 E4 F h H L q 0o 13.80 1.20 1.70 8o 9.30 7.20 7.20 6.10 5.90 1.25 0.50 14.40 1.80 0.543 0.047 0.067 mm MIN. 3.35 0.00 0.40 0.35 9.40 7.40 1.27 9.50 7.40 7.60 6.35 6.10 1.35 0.366 0.283 0.283 0.240 0.232 0.049 0.002 0.567 0.071 TYP. MAX. 3.65 0.10 0.60 0.55 9.60 7.60 MIN. 0.132 0.000 0.016 0.013 0.370 0.291 0.050 0.374 0.291 0.300 0.250 0.240 0.053 inch TYP. MAX. 0.144 0.004 0.024 0.022 0.378 0.300
B
0.10 A B
10 = H = A F A1 =
6
=
=
=
E = 1 5
=
E2
E3
E1
E4
=
=
A
=
SEATING PLANE DETAIL "A"
e
0.25
M
B
C Q
h
D = D1 = = = SEATING PLANE
= A1 L
DETAIL "A"
0068039-C
16/17
VIPER20B / VIPER20BSP
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a trademark of STMicroelectronics (c) 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. http://www.st.com .
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