VIPER06 Fixed-frequency VIPerTM plus family Datasheet -- production data 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 Figure 1. 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 DIP-7 Typical application $# INPUT VOLTAGE SSO10 $# OUTPUT VOLTAGE $2 !). #/-0 6)0%2 '.$ 6$$ ,)- &" !-V Applications Replacement of capacitive power supplies Home appliances Power metering LED drivers Description The VIPER06 is an offline converter with an 800 V avalanche rugged power section, a PWM controller, a user-defined overcurrent limit, openloop 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. March 2012 This is information on a product in full production. Doc ID 022794 Rev 1 1/28 www.st.com 28 Contents VIPER06 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 Power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 High voltage current generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10 Soft startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 11 Adjustable current limit set point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 12 FB pin and COMP pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 13 Burst mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 14 Automatic auto-restart after overload or short-circuit . . . . . . . . . . . . 19 15 Open-loop failure protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 16 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/28 Doc ID 022794 Rev 1 VIPER06 Contents 17 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Doc ID 022794 Rev 1 3/28 Block diagram 1 VIPER06 Block diagram Figure 2. Block diagram VDD SOFT START DRAIN SUPPLY & UVLO Internal Supply BUS & REFERENCE VOLTAGES HV_ON IDLIM LIM UVLO set-up THERMAL SHUTDOWN Oscillator OTP - VCOMPL IDDch BURST-MODE Logic + OCP Burst BURST TURN-ON LOGIC S LEB R Q + PWM OLP LOGIC - FB VREF_FB E/A + OTP RSENSE COMP 2 GND Typical power Table 1. Typical power 85-265 VAC 230 VAC Part number VIPER06 Adapter(1) Open frame(2) Adapter(1) Open frame(2) 6W 8W 4W 5W 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. 4/28 Doc ID 022794 Rev 1 VIPER06 3 Pin settings Pin settings Figure 3. Connection diagram (top view) DRAIN GND DRAIN VDD DRAIN LIM DRAIN FB DRAIN COMP DRAIN DRAIN AM11339v1 Note: The copper area for heat dissipation has to be designed under the DRAIN pins. Table 2. Pin description Pin Name Function 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. 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 VFB_REF in Table 6). An external resistor divider is required for higher output voltages. DIP-7 SSO10 1 4 4 5 5 7, 8 6-10 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 VCOMPL to VCOMPH (Table 6). High-voltage drain pins. The built-in high-voltage switched startup bias DRAIN current is drawn from these pins too. Pins connected to the metal frame to facilitate heat dissipation. Doc ID 022794 Rev 1 5/28 Electrical data VIPER06 4 Electrical data 4.1 Maximum ratings Table 3. Symbol Value Pin (DIP-7) Parameter Unit Min VDRAIN 7, 8 Drain-to-source (ground) voltage EAV 7, 8 IAR Max 800 V Repetitive avalanche energy (limited by TJ = 150 C) 2 mJ 7, 8 Repetitive avalanche current (limited by TJ = 150 C) 1 A IDRAIN 7, 8 Pulse drain current (limited by TJ = 150 C) 2.5 A VCOMP 5 Input pin voltage -0.3 3.5 V VFB 4 Input pin voltage -0.3 4.8 V VLIM 3 Input pin voltage -0.3 2.4 V VDD 2 Supply voltage -0.3 Selflimited V IDD 2 Input current 20 mA Power dissipation at TA < 40 C (DIP-7) 1 W Power dissipation at TA < 50 C (SSO10) 1 W PTOT TJ TSTG 4.2 Absolute maximum ratings Operating junction temperature range -40 150 C Storage temperature -55 150 C Thermal data Table 4. Symbol Thermal data Parameter Max value Max value SSO10 DIP-7 RthJP Thermal resistance junction pin (dissipated power = 1 W) 35 40 C/W RthJA Thermal resistance junction ambient (dissipated power = 1 W) 100 110 C/W RthJA Thermal resistance junction ambient (1) (dissipated power = 1 W) 80 90 C/W 1. When mounted on a standard single side FR4 board with 100 mm2 (0.155 sq in) of Cu (35 m thick). 6/28 Unit Doc ID 022794 Rev 1 VIPER06 4.3 Electrical data Electrical characteristics (TJ = -25 to 125 C, VDD = 14 V (a) unless otherwise specified). Table 5. Power section Symbol VBVDSS IOFF RDS(on) COSS Table 6. Symbol Parameter Test condition Min Typ Max Unit Breakdown voltage IDRAIN = 1 mA, VCOMP = GND, TJ = 25 C OFF state drain current VDRAIN = max rating, VCOMP = GND 60 A IDRAIN = 0.2 A, TJ = 25 C 32 IDRAIN = 0.2 A, TJ = 125 C 67 Drain-source on-state resistance 800 Effective (energy related) output capacitance VDRAIN = 0 to 640 V V 10 pF Supply section Parameter Test condition Min Typ Max Unit Voltage VDRAIN_START Drain-source startup voltage 25 45 V IDDch1 Startup charging current VDRAIN = 100 V to 640 V, VDD = 4 V -0.6 -1.8 mA IDDch2 Charging current during operation VDRAIN = 100 V to 640 V, VDD = 9 V falling edge -7 -14 mA 11.5 23.5 V VDD VDDclamp VDDon VDDCSon VDDoff Operating voltage range VDD clamp voltage IDD = 15 mA 23.5 V VDD startup threshold 12 VDD on internal high-voltage current generator threshold 9.5 10.5 11.5 VDD undervoltage shutdown threshold 7 13 8 14 V V 9 V FOSC = 0 kHz, VCOMP = GND 0.6 mA VDRAIN = 120 V, FOSC = 30 kHz 1.3 mA VDRAIN = 120 V, FOSC = 60 kHz 1.45 mA VDRAIN = 120 V, FOSC = 115 kHz 1.6 mA 0.35 mA Current IDD0 IDD1 Operating supply current, not switching Operating supply current, switching IDDoff Operating supply current with VDD < VDDoff VDD < VDDoff IDDol Open-loop failure current threshold VDD = VDDclamp VCOMP = 3.3 V, 4 mA a. Adjust VDD above VDDon startup threshold before setting to 14 V. Doc ID 022794 Rev 1 7/28 Electrical data Table 7. VIPER06 Controller section Symbol Parameter Test condition Min Typ Max Unit Error amplifier VREF_FB FB reference voltage 3.2 IFB_PULL UP Current pull-up GM Transconductance 3.3 3.4 V -1 A 2 mA/V 0.5 V 3 V Current setting (LIM) pin VLIM_LOW Low-level clamp voltage ILIM = -100 A Compensation (COMP) pin VCOMPH Upper saturation limit TJ = 25 C VCOMPL Burst mode threshold TJ = 25 C VCOMPL_HYS Burst mode hysteresis HCOMP TJ = 25 C VCOMP / IDRAIN 1.1 1.2 40 4 V mV 9 V/A VFB = GND 15 k Source / sink current VFB > 100 mV 150 A Max source current VCOMP = GND, VFB = GND 220 A RCOMP(DYN) Dynamic resistance ICOMP 1 Current limitation IDlim Drain current limitation tSS Soft-start time TON_MIN Minimum turn-on time IDlim_bm Burst mode current limitation ILIM = -10 A, VCOMP = 3.3 V, 0.32 0.35 0.38 TJ = 25 C 8.5 ms 450 VCOMP = VCOMPL A ns 85 mA Overload time 50 ms Restart time after fault 1 s Overload tOVL tRESTART Oscillator section FOSC FD Switching frequency Modulation depth FM Modulation frequency DMAX Maximum duty cycle 8/28 VIPER06Xx 27 30 33 kHz VIPER06Lx 54 60 66 kHz VIPER06Hx 103 115 127 kHz FOSC = 30 kHz 3 kHz FOSC = 60 kHz 4 kHz FOSC = 115 kHz 8 kHz 230 Hz 70 Doc ID 022794 Rev 1 80 % VIPER06 Table 7. Electrical data Controller section (continued) Symbol Parameter Test condition Min Typ Max Unit Thermal shutdown TSD THYST Thermal shutdown temperature Thermal shutdown hysteresis Doc ID 022794 Rev 1 150 160 C 30 C 9/28 Typical electrical characteristics VIPER06 5 Typical electrical characteristics Figure 4. IDlim vs. TJ 1.04 Figure 5. ID l im/ ID l im@ 2 5C 1.04 FOSC vs. TJ F O SC / F O SC @ 2 5C 1.02 1.02 1.00 1.00 0.98 0.98 0.96 0.96 0.94 0.94 -50 0 50 100 TJ [C] Figure 6. 1.020 150 0.92 -50 0 50 100 AM01145v1 AM01144v1 VDRAIN_START vs. TJ Figure 7. V D R A I N _ ST A R T / V D R A IN _ ST A R T @ 2 5C 1.30 1.010 150 TJ [C] HCOMP vs. TJ HC OM P / HC OM P@2 5C 1.20 1.000 1.10 0.990 1.00 0.980 0.90 0.970 0.960 -50 0 50 100 150 0.80 -50 0 50 100 AM01147v1 AM01146v1 Figure 8. 1.10 150 TJ [C] TJ [C] GM vs. TJ Figure 9. VREF_FB vs. TJ V R EF _ F B / V R EF _ F B @ 2 5C GM / GM @ 2 5C 1.08 1.05 1.04 1.00 1.00 0.96 0.95 0.92 0.90 0.88 0.85 0.80 -50 0.84 0 50 100 150 0.80 -50 TJ [C] 50 100 150 TJ [C] AM01148v1 10/28 0 Doc ID 022794 Rev 1 AM01149v1 VIPER06 Typical electrical characteristics Figure 10. ICOMP vs. TJ Figure 11. Operating supply current (no switching) vs. TJ IC O M P / I C OM P@ 2 5C ID D 0 / I D D 0 @ 2 5C 1.08 1.08 1.04 1.04 1.00 1.00 0.96 0.96 0.92 0.92 0.88 0.88 0.84 0.84 0.80 -50 0 50 100 150 0.80 -50 0 50 100 150 TJ [C] TJ [C] AM01150v1 Figure 12. Operating supply current (switching) vs. TJ 1.10 AM01151v1 Figure 13. IDlim vs. RLIM I D D 1 / ID D 1@ 2 5C 1.10 ID l im / ID lim@ 10 0 KOhm 1.00 1.05 0.90 1.00 0.80 0.95 0.70 0.90 0.60 0.85 0.50 0.80 0.40 0.75 0.30 0.70 0.20 0.65 0.60 -50 0.10 0 50 100 150 0.00 0 TJ [C] 20 40 60 80 100 Rlim [kOhm ] AM01152v1 Figure 14. Power MOSFET on-resistance vs. TJ AM01153v1 Figure 15. Power MOSFET breakdown voltage vs. TJ Doc ID 022794 Rev 1 11/28 Typical electrical characteristics VIPER06 Figure 16. Thermal shutdown VDD VDDon VDDCSon VDDoff time IDRAIN time TJ TSD TSD - THYST time Normal operation 12/28 Shut down after over temperature Doc ID 022794 Rev 1 Normal operation VIPER06 Typical circuit Figure 17. Flyback converter (non-isolated output) Rin L1 1 AC IN 6 Din 2 - + 4 C2 C3 + + Rcl Ccl VOUT Dout 12 AC IN 3 6 Typical circuit D1 4 + Cout 10 Daux VIPer16 Rfb1 FB Rfb2 DRAIN VDD COMP C1 Rcomp1 CONTROL GND LIM Ccomp2 RLIM (optional) Ccomp1 AM01197v1 Figure 18. Flyback converter (isolated output) AC IN R1 D1 T2 L1 R2 C5 D3 VOUT D2 + VIPER06 C3 C1 + C2 FB COMP - DRAIN VDD + C7 C6 CONTROL LIM R3 GND R5 IC3 R4 C4 C8 IC2 R6 AC IN AM01195v1 Doc ID 022794 Rev 1 13/28 Typical circuit VIPER06 Figure 19. Flyback converter (isolated output without optocoupler) FUSE 1 AC IN TRANSF 2 - L1 + 4 D0 BRIDGE + C1 + C2 Rcl Ccl 3 AC IN 6 D2 Vout 12 Raux + D1 Daux 4 3 Cout 10 VIPer06 Rfbh CVDD FB CONTROL COMP Cfb Rfbl DRAIN VDD + . 1 GND LIM Rc Cp RLIM (optional) Cc AM01196v1 Figure 20. Buck converter Rfb1 AC IN L1 C2 VIPer06 C3 DRAIN VDD GND FB C1 Cfb COMP Rcomp Ccomp Rfb2 C4 CONTROL D2 LIM GND RLIM (optional) Lout Dout Vout Cout AM01194v1 14/28 Doc ID 022794 Rev 1 VIPER06 7 Power section Power section The power section is implemented with an N-channel power MOSFET with a breakdown voltage of 800 V min. and a typical RDS(on) of 32 . It includes a SenseFET structure to 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 VDRAIN_START threshold, sourcing a IDDch1 current (see Table 6 on page 7). As the VDD voltage reaches the VDDon threshold, the power section starts switching and the highvoltage 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 VDDCSon and VDDon (see Table 6 on page 7), delivering IDDch2, see Table 6 on page 7 to the VDD capacitor during the MOSFET off-time (see Figure 21). 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 VDDCSon. At converter power-down, the VDD voltage drops and the converter activity stops as it falls below the VDDoff threshold (see Table 6 on page 7). Figure 21. Power-on and power-off VIN VIN < VDRAIN_START HV startup is no more activated VDRAIN_START VDD With internal self-supply Without internal self-supply regulation is lost here t VDDon VDDCSon VDDoff VDRAIN t IDD t IDDch2 IDDch1 Power-on Normal operation Doc ID 022794 Rev 1 Power-off t 15/28 Oscillator 9 VIPER06 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 IDlim. In this way the drain current is 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 on page 8, 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. 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 RSENSE and the voltage is applied to the noninverting input of the PWM comparator, see Figure 2 on page 4. 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 on page 4, checks the level of the drain current and switches OFF the power MOSFET in case the current is higher than the threshold IDlim, see Table 7 on page 8. The level of the drain current limit IDlim can be reduced using a resistor RLIM connected between the LIM and GND pins. Current is sunk from the LIM pin through the resistor RLIM and the setup of IDlim depends on the level of this current. The relation between IDlim and RLIM is shown in Figure 13 on page 11. When the LIM pin is left open or if RLIM has a high value (i.e. > 80 k), the current limit is fixed to its default value, IDlim, as given in Table 7 on page 8. 16/28 Doc ID 022794 Rev 1 VIPER06 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, VREF_FB, see Table 7 on page 8. The output of the error amplifier sources and sinks the current, ICOMP, respectively to and 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 on page 4 and the Figure 22. When the power supply output voltage is equal to the error amplifier reference voltage, VREF_FB, a single resistor has to be connected from the output to the FB pin. For higher 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 22, 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 22. The current loop has to be closed on the COMP pin through the opto-transistor in parallel with the compensation network. The VCOMP dynamic range is between VCOMPL and VCOMPH shown in Figure 23 on page 18. When the voltage VCOMP drops below the voltage threshold VCOMPL, the converter enters burst mode, see Section 13 on page 18. When the voltage VCOMP rises above the VCOMPH threshold, the peak drain current, as well as the deliverable output power, will reach its limit. Figure 22. Feedback circuit Without Isolation: switch open & E/A enabled VREF With Isolation: switch closed & E/A disabled VOUT RCOMP VCOMPL + PWM stop - SW BUS FB from RSENSE - RH VREF_FB E/A + 12 FB pin and COMP pin + Isolation RL nR No Isolation to PWM - R COMP Doc ID 022794 Rev 1 17/28 Burst mode VIPER06 Figure 23. COMP pin voltage versus IDRAIN I DRAIN IDlim IDlim_bm VCOMPL VCOMPH VCOMP AM01095v1 13 Burst mode When the voltage VCOMP drops below the threshold, VCOMPL, the power MOSFET is kept in the OFF state and the consumption is reduced to the IDD0 current, as reported on Table 6 on page 7. In reaction to the loss of energy, the VCOMP voltage increases and as soon as it exceeds the threshold VCOMPL + VCOMPL_HYS, the converter starts switching again with a level of consumption equal to the IDD1 current. This ON-OFF operation mode, referred to as "burst mode" and shown in Figure 24 on page 18, 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 IDlim_bm (given inTable 7 on page 8) in order to avoid the audible noise issue. Figure 24. Load-dependent operating modes: timing waveforms VCOMP VCOMPL +VCOMPL_HYS VCOMPL time IDD IDD1 IDD0 time IDRAIN IDlim_bm time Burst Mode 18/28 Doc ID 022794 Rev 1 VIPER06 14 Automatic auto-restart after overload or short-circuit 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, IDlim , given in Table 7 on page 8 or the one set by the user through the RLIM resistor, shown in Figure 13 on page 11. After the reset of the counter, if the peak drain current is continuously equal to the level IDlim, the counter will be incremented until the fixed time, tOVL, at which point the power MOSFET switch ON will be disabled. It will be activated again through the soft-start after the tRESTART time (see Figure 25 and Figure 26 on page 19) and the time values mentioned in Table 7 on page 8. 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 tOVL. The protection sequence continues until the overload condition is removed, see Figure 25 and Figure 26. 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. Figure 25. Timing diagram: OLP sequence (IC externally biased) SHORT CIRCUIT REMOVED HERE SHORT CIRCUIT OCCURS HERE VDD VDDon VDDCSon time IDRAIN IDlim_bm t1* tOVL tRESTART tOVL tRESTART time tRESTART tSS tSS tSS * The time t1 can be lower or equal to the time tOVL Figure 26. Timing diagram: OLP sequence (IC internally biased) VDD SHORT CIRCUIT REMOVED HERE SHORT CIRCUIT OCCURS HERE VDDon VDDCSon time IDRAIN IDlim_bm t1* tOVL tRESTART tOVL tRESTART tSS tSS time tRESTART tSS * The time t1 can be lower than or equal to the time tOVL Doc ID 022794 Rev 1 19/28 Open-loop failure protection 15 VIPER06 Open-loop failure protection If the power supply has been designed using flyback topology and the VIPER06 is supplied by an auxiliary winding, as shown in Figure 27 and Figure 28 on page 21, the converter is protected against feedback loop failure or accidental disconnections of the winding. The following description is applicable for the schematics of Figure 27 and Figure 28 on page 21, 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, VOUT, will increase as does the auxiliary voltage, VAUX, which is coupled with the output through the secondary-to-auxiliary turns ratio. As the auxiliary voltage increases up to the internal VDD active clamp, VDDclamp (the value is given in Table 7 on page 8) and the clamp current injected on the VDD pin exceeds the latch threshold, IDDol (the value is given in Table 7 on page 8), a fault 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 IDDol through the VDD clamp) have to be verified to reveal the fault. If RL is open or RH is shorted, the output voltage, VOUT, will be clamped to the reference voltage VREF_FB (for non-isolated flyback) or to the external TL voltage reference (for isolated flyback). Figure 27. FB pin connection for non-isolated flyback RAUX VAUX CVDD VDD VOUT VCOMPL + PWM stop - RH BUS FB from RSENSE - VREF_FB E/A + RL + nR - R COMP RS CP CS 20/28 DAUX Doc ID 022794 Rev 1 to PWM VIPER06 Open-loop failure protection Figure 28. FB pin connection for isolated flyback RAUX DAUX VAUX CVDD VREF RCOMP VCOMPL Disabled VOUT from RSENSE E/A + VREF_FB PWM stop BUS - FB + - SW + nR - to PWM R ROPTO RH COMP R3 U5 RC CCOMP CC TL RL - Doc ID 022794 Rev 1 21/28 Package mechanical data 16 VIPER06 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Table 8. DIP-7 mechanical data mm Dim. Typ Min A Max 5.33 A1 0.38 A2 3.30 2.92 4.95 b 0.46 0.36 0.56 b2 1.52 1.14 1.78 c 0.25 0.20 0.36 D 9.27 9.02 10.16 E 7.87 7.62 8.26 E1 6.35 6.10 7.11 e 2.54 eA 7.62 eB 10.92 L 3.30 M(1)(2) 2.508 N 0.50 2.92 3.81 0.40 0.60 N1 O(2)(3) 0.60 0.548 1. Creepage distance > 800 V. 2. Creepage distance as given in the 664-1 CEI / IEC standard. 3. Creepage distance 250 V. Note: 22/28 1 The lead size includes the thickness of the lead finishing material. 2 Dimensions do not include mold protrusion, not to exceed 0.25 mm in total (both sides). 3 Package outline exclusive of metal burr dimensions. 4 Datum plane "H" coincident with the bottom of lead, where lead exits body (refer to Figure 29 on page 23). Doc ID 022794 Rev 1 VIPER06 Package mechanical data Figure 29. DIP-7 package dimensions Doc ID 022794 Rev 1 23/28 Package mechanical data Table 9. VIPER06 SSO10 mechanical data Databook (mm.) Dim. Typ Min. A 24/28 Max 1.75 A1 0.10 0.25 A2 1.25 b 0.31 0.51 c 0.17 0.25 D 4.90 4.80 5 E 6 5.80 6.20 E1 3.90 3.80 4 e 1 h 0.25 0.50 L 0.40 0.90 K 0 8 Doc ID 022794 Rev 1 VIPER06 Package mechanical data Figure 30. SSO10 package dimensions 8140761 rev. A Doc ID 022794 Rev 1 25/28 Order codes 17 VIPER06 Order codes Table 10. Ordering information Order code Package Packaging DIP-7 Tube VIPER06XN VIPER06LN VIPER06HN VIPER06XS Tube VIPER06XSTR Tape and reel VIPER06LS Tube SSO10 26/28 VIPER06LSTR Tape and reel VIPER06HS Tube VIPER06HSTR Tape and reel Doc ID 022794 Rev 1 VIPER06 18 Revision history Revision history s Table 11. Document revision history Date Revision 08-Mar-2012 1 Changes Initial release. Doc ID 022794 Rev 1 27/28 VIPER06 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2012 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 28/28 Doc ID 022794 Rev 1 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: STMicroelectronics: VIPER06HN VIPER06HS VIPER06LN VIPER06LS VIPER06LSTR VIPER06XSTR VIPER06XS VIPER06XN VIPER06HSTR