VIPER37LD

VIPER37 VIPerPlus family: fixed frequency offline converter Datasheet - production data • High primary current protection (2nd OCP) • Input undervoltage setting (brownout) • Onboard soft-start • Safe auto-restart after a fault condition 62QDUURZ • Hysteretic thermal shutdown 6',3 Applications Figure 1. Typical topology + + DC input high voltage wide range DC Output voltage DRAIN DRAIN DRAIN DRAIN DRAIN VIPER37 GND VDD CONT FB BR • SMPS for set-top boxes, DVD players and recorders, white goods • Auxiliary power supply for consumer and home equipment • ATX auxiliary power supply • Low / medium power AC-DC adapters Description This device is an offline converter with an 800 V rugged power section, a PWM control, two levels of overcurrent protection, overvoltage and 800 V avalanche-rugged power MOSFET overload protection, hysteretic thermal protection, allowing ultra wide range input Vac to be soft-start, and safe auto-restart after the removal achieved of any fault condition. Burst mode operation and very low device consumption help to meet the PWM operation with adjustable limiting current standby energy saving regulations. Advance 30 mW standby power at 265 Vac frequency jittering reduces EMI filter costs. Operating frequency: Brownout function protects the switch mode – 60 kHz (L type), 115 kHz (H type) power supply when the rectified input voltage level is below the normal minimum level specified Frequency jittering for low EMC for the system. The high voltage startup circuit is Output overvoltage protection embedded in the device. Table 1. Device summary Features • • • • • • Order code Package Packing VIPER37LE SDIP10 VIPER37HE Tube VIPER37HD VIPER37LD SO16 narrow VIPER37HDTR Tape and reel VIPER37LDTR July 2015 This is information on a product in full production. DocID022218 Rev 3 1/35 www.st.com Contents VIPER37 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 circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 Efficiency performances for a typical flyback converter . . . . . . . . . . . 16 8 Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9 2/35 8.1 Power section and gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.2 High voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.3 Power-up and soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.4 Power down operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.5 Auto-restart operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.6 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.7 Current mode conversion with adjustable current limit set point . . . . . . . 21 8.8 Overvoltage protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8.9 About the CONT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8.10 Feedback and overload protection (OLP) . . . . . . . . . . . . . . . . . . . . . . . . 24 8.11 Burst mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 26 8.12 Brownout protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 8.13 2nd level overcurrent protection and hiccup mode . . . . . . . . . . . . . . . . . . 29 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 DocID022218 Rev 3 VIPER37 10 Contents 9.1 SDIP10 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 9.2 SO16 narrow package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 DocID022218 Rev 3 3/35 35 Block diagram 1 VIPER37 Block diagram Figure 2. Block diagram VDD Vcc BR DRAIN + Vin_OK VBRth Internal Supply bus & Ref erence Voltages SUPPLY & UVLO HV_ON Istart-up 15uA UVLO - CONT OCP BLOCK OTP OCP BURST + SOFT START . OVP LOGIC + THERMAL SHUTDOWN OSCILLATOR PWM TURN-ON LOGIC LEB S Q R1 R2 6uA + OVP 2nd OCP LOGIC Ref OLP OVP OTP Rsense BURST-MODE LOGIC BURST FB 2 GND Typical power Table 2. Typical power 85-265 VAC 230 VAC Part number VIPER37 Adapter(1) Open frame(2) Adapter(1) Open frame(2) 18 W 20 W 13 W 15 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 heatsinking. 4/35 DocID022218 Rev 3 VIPER37 3 Pin settings Pin settings Figure 3. Connection diagram (top view) Note: The copper area for heat dissipation must be designed under the DRAIN pins. Table 3. Pin description Pin n. Name Function SO16N 1...2 GND This pin represents the device ground and the source of the power section. 3 N.C. Not connected. 4 N.A. Not available for user. This pin is mechanically connected to the controller die pad of the frame. In order to improve the noise immunity, is highly recommended connect it to GND (pin 1-2). 5 VDD Supply voltage of the control section. This pin also provides the charging current of the external capacitor during start-up time. 6 Control pin. The following functions can be selected: 1. current limit set point adjustment. The internal set default value of the cycle-bycycle current limit can be reduced by connecting to ground an external resistor. CONT 2. output voltage monitoring. A voltage exceeding VOVP threshold (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. FB Control input for duty cycle control. Internal current generator provides bias current for loop regulation. A voltage below the threshold VFBbm activates the burst-mode operation. A level close to the threshold VFBlin means that we are approaching the cycle-by-cycle over-current set point. 8 BR Brownout protection input with hysteresis. A voltage below the threshold VBRth shuts down (not latch) the device and lowers the power consumption. Device operation restarts as the voltage exceeds the threshold VBRth + VBRhyst. It can be connected to ground when not used. 9...12 N.C. 7 13...16 Not connected. High voltage drain pin. The built-in high voltage switched start-up bias current is DRAIN drawn from this pin too. Pins connected to the metal frame to facilitate heat dissipation. DocID022218 Rev 3 5/35 35 Electrical data VIPER37 4 Electrical data 4.1 Maximum ratings Table 4. Absolute maximum ratings Value Symbol Parameter Unit Min. VDRAIN Drain-to-source (ground) voltage 800 V EAV Repetitive avalanche energy (limited by TJ = 150 °C) 5 mJ IAR Repetitive avalanche current (limited by TJ = 150 °C) 1.5 A 3 A IDRAIN Pulse drain current VCONT Control input pin voltage -0.3 6 V VFB Feedback voltage -0.3 5.5 V VBR Brownout input pin voltage -0.3 5 V VDD Supply voltage (IDD = 25 mA) -0.3 Self limited V IDD Input current 25 mA Power dissipation at TA < 60 °C 1.5 W PTOT TJ TSTG 4.2 Max. Operating junction temperature range -40 150 °C Storage temperature -55 150 °C Thermal data Table 5. Thermal data Max. value Symbol Parameter Unit SO16N SDIP10 RthJP Thermal resistance junction pin (Dissipated power = 1 W) 35 35 °C/W RthJA Thermal resistance junction ambient (Dissipated power = 1 W) 110 100 °C/W RthJA Thermal resistance junction ambient (1) (Dissipated power = 1 W) 80 85 °C/W 1. When mounted on a standard single side FR4 board with 100 mm2 (0.155 sq. in.) of Cu (35 µm thick). 6/35 DocID022218 Rev 3 VIPER37 4.3 Electrical data Electrical characteristics (TJ = -25 to 125 °C, VDD = 14 V(a); unless otherwise specified). Table 6. Power section Symbol Parameter VBVDSS IOFF Test condition Max. Unit IDRAIN = 1 mA, VFB = GND TJ = 25 °C OFF state drain current VDRAIN = max. rating, VFB = GND, TJ = 25 °C 60 μA IDRAIN = 0.4 A, VFB = 3 V, VBR = GND, TJ = 25 °C 4.5 Ω IDRAIN = 0.4 A, VFB = 3 V, VBR = GND, TJ = 125 °C 9 Ω 800 VDRAIN = 0 to 640 V, TJ = 25 °C Effective (energy related) output capacitance COSS Typ. Breakdown voltage Drain-source on state resistance RDS(on) Min. V 17 pF Table 7. Supply section Symbol Parameter Test condition Min. Typ. Max. Unit 60 80 100 V -2 -3 -4 mA VDRAIN = 120 V VBR = GND VFB = GND VDD = 5 V after fault -0.4 -0.6 -0.8 mA 23.5 V Voltage VDRAIN_START IDDch Drain-source start voltage Startup charging current VDRAIN = 120 V VBR = GND VFB = GND VDD = 4 V VDD Operating voltage range After turn-on 8.5 VDDclamp VDD clamp voltage IDD = 20 mA 23.5 VDDon VDD startup threshold VDDoff VDD undervoltage shutdown threshold VDD(RESTART) VDD restart voltage threshold VDRAIN = 120 V VBR = GND VFB = GND V 13 14 15 V 7.5 8 8.5 V 4 4.5 5 V a. Adjust VDD above VDDon startup threshold before setting to 14 V. DocID022218 Rev 3 7/35 35 Electrical data VIPER37 Table 7. Supply section (continued) Symbol Parameter Test condition Min. Typ. Max. Unit VFB = GND, FSW = 0 kHz, VBR = GND, VDD = 10 V 0.9 mA VDRAIN = 120 V, FSW = 60 kHz 2.5 mA VDRAIN = 120 V, FSW = 115 kHz 3.5 mA Current Operating supply current, not switching IDD0 Operating supply current, switching IDD1 IDD_FAULT Operating supply current, with protection tripping VDD = 10 V 400 μA IDD_OFF Operating supply current with VDD < VDD_OFF VDD = 7 V 270 μA Table 8. Controller section Symbol Parameter Test condition Min. Typ. Max. Unit Feedback pin VFBolp Overload shutdown threshold 4.5 4.8 5.2 V VFBlin Linear dynamics upper limit 3.2 3.5 3.7 V VFBbm Burst mode threshold Voltage falling 0.6 V VFBbmhys Burst mode hysteresis Voltage rising 100 mV IFB RFB(DYN) HFB VFB = 0.3 V Feedback sourced current -150 3.3 V < VFB < 4.8 V Dynamic resistance VFB < 3.3 V ∆VFB / ∆ID -200 -280 μA μA -3 14 21 kΩ 0.5 2 V/A CONT pin VCONT_l Low level clamp voltage ICONT = -100 µA VCONT_h High level clamp voltage ICONT = 1 mA 0.5 V 5 5.5 6 V 0.95 1 1.05 A Current limitation IDlim Max. drain current limitation tSS Soft-start time TON_MIN td tLEB ID_BM 8/35 VFB = 4 V, ICONT = -10 µA TJ = 25 °C 8.5 Minimum turn-on time 220 400 ms 480 ns Propagation delay (1) 100 ns Leading edge blanking (1) 300 ns Peak drain current during burst mode VFB = 0.6 V 160 mA DocID022218 Rev 3 VIPER37 Electrical data Table 8. Controller section (continued) Symbol Parameter Test condition Min. Typ. Max. Unit 54 60 66 kHz 103 115 127 kHz Oscillator section VIPER37L FOSC FD VDD = operating voltage range, VFB = 1 V VIPER37H FM Modulation frequency DMAX Maximum duty cycle Overcurrent protection (2 IDMAX VIPER37L ±4 kHz VIPER37H ±8 kHz 250 Hz Modulation depth nd 70 80 % OCP) Second overcurrent threshold 1.7 A Overvoltage protection VOVP TSTROBE Overvoltage protection threshold 2.7 Overvoltage protection strobe time 3 3.3 2.2 V us Brownout protection VBRth Brownout threshold Voltage falling VBRhyst Voltage hysteresis above VBRth Voltage rising IBRhyst Current hysteresis VBRclamp VDIS 0.41 0.45 50 7 Clamp voltage IBR = 250 µA Brownout disable voltage 0.49 mV 12 3 50 V μA V 150 mV Thermal shutdown TSD THYST Thermal shutdown temperature (1) Thermal shutdown hysteresis (1) 150 160 °C 30 °C 1. Specification assured by design, characterization and statistical correlation. DocID022218 Rev 3 9/35 35 Electrical data VIPER37 Figure 4. Minimum turn-on time test circuit V(DRAIN) 14 V GND DRAIN VDD DRAIN CONT DRAIN FB DRAIN BR DRAIN 90 % TONmin 50 Ω 10 % Time I(DRAIN) IDLIM 30 V 3.5 V Time Figure 5. Brownout threshold test circuits 14 V IBRhyst V(BR) GND DRAIN VDD DRAIN VBRth+VBRhyst VBRth CONT DRAIN VDIS FB DRAIN BR DRAIN Time IBRhyst 30 V 2V I(BR) 10 kΩ I(DRAIN) Time Time Figure 6. OVP threshold test circuits GND DRAIN VDD DRAIN CONT DRAIN FB DRAIN BR DRAIN 14 V V(CONT) VOVP 10 kΩ V(DRAIN) Time 30 V 2V Time Note: 10/35 Adjust VDD above VDDon startup threshold before setting to 14 V. DocID022218 Rev 3 VIPER37 Typical electrical characteristics 5 Typical electrical characteristics Figure 7. Current limit vs. TJ Figure 8. Switching frequency vs. TJ ,'/,0,'/,0#ƒ&  )26&)26&#ƒ&                                      7->ƒ&@     ".W  ".W Figure 9. Drain start voltage vs. TJ   7->ƒ&@ Figure 10. HFB vs. TJ 9'5$,1B67$579'5$,1B67$57#ƒ&   +)%+)%#ƒ&                                7->ƒ&@           7->ƒ&@ ".W DocID022218 Rev 3 ".W 11/35 35 Typical electrical characteristics VIPER37 Figure 11. Brownout threshold vs. TJ Figure 12. Brownout hysteresis vs. TJ 9%5WK9%5WK#ƒ&  9%5+\VW9%5+\VW#ƒ&                                            7->ƒ&@ 7->ƒ&@ ".W Figure 13. Brownout hysteresis current vs. TJ ".W Figure 14. Operating supply current (not switching) vs. TJ ,'',''#ƒ&  ,%5+\VW,%5+\VW#ƒ&                            7->ƒ&@ 12/35       ".W DocID022218 Rev 3      7->ƒ&@      ".W VIPER37 Typical electrical characteristics Figure 15. Operating supply current (switching) vs. TJ Figure 16. Current limit vs. RLIM ,'',''#ƒ&   ,'/,0,'/,0#.2KP                                           5OLP>N2KP@ 7->ƒ&@ ".W ".W Figure 17. Power MOSFET ON resistance vs. TJ Figure 18. Power MOSFET breakdown voltage vs. TJ 5'6215'621#ƒ& 9%9'669%9'66#ƒ&                              7->ƒ&@           7->ƒ&@ ".W DocID022218 Rev 3 ".W 13/35 35 Typical electrical characteristics VIPER37 Figure 19. Thermal shutdown 9'' 9''RQ 9''RII 9''5(67$57 WLPH ,'5$,1 WLPH 776' 76' 7+