SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 Transformer Driver for Isolated Power Supplies Check for Samples: SN6501 FEATURES APPLICATIONS • • • • 1 • • Push-Pull Driver for Small Transformers Single 3.3 V or 5 V Supply High Primary-side Current Drive: – 5 V Supply: 350 mA (max) – 3.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. FUNCTIONAL BLOCK DIAGRAM SN6501 D1 Q VCC Gate Drive OSC D2 Q GND GND PIN FUNCTIONS D1 1 VCC 2 D2 3 5 GND 4 GND PIN No.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) VALUES VCC Supply voltage VD1, VD2 Output switch voltage ID1P, ID2P Peak output switch current 500 mA PTOT Continuous power dissipation 250 mW ESD –0.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com ELECTRICAL CHARACTERISTICS Over full-range of recommended operating conditions, unless otherwise noted PARAMETER RON Switch-on resistance ICC Average supply current (1) fST Startup frequency fSW D1, D2 Switching frequency tr-D D1, D2 output rise time tf-D D1, D2 output fall time tBBM Break-before-make time (1) 4 TEST CONDITIONS MIN VCC = 3.3 V ± 10%, See Figure 2 TYP MAX 1 3 VCC = 5 V ± 10%, See Figure 2 0.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 TYPICAL OPERATING CHARACTERISTICS Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). 9 90 8 80 7 70 6 60 TP1 TP2 5 Efficiency - % VOUT - V See Table 2 and Table 3 for Transformer Specifications.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com TYPICAL OPERATING CHARACTERISTICS (continued) Typical Curves in Figure 3 through Figure 14 are measured with Circuit in Figure 67 at TP1; whereas, Typical Curves in Figure 15 through Figure 54 are measured with Circuit in Figure 68 at TP1 and TP2 (TA = 25°C unless otherwise noted). See Table 2 and Table 3 for Transformer Specifications. 5 3.3 VCC = 5 V VCC = 3.3 V 4.95 3.25 VD1, VD2 Voltage Swing - V VD1, VD2 Voltage Swing - V 4.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 APPLICATION INFORMATION The SN6501 is a transformer driver designed for low-cost, small form-factor, isolated DC-DC converters utilizing the push-pull topology. The device includes an oscillator that feeds a gate-drive circuit. The gate-drive, comprising a frequency divider and a break-before-make (BBM) logic, provides two complementary output signals which alternately turn the two output transistors on and off.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 CR1 www.ti.com CR1 VOUT C C RL VIN RL VIN CR2 Q2 VOUT CR2 Q1 Q2 Q1 Figure 63. Switching Cycles of a Push-Pull Converter When Q1 conducts, VIN drives a current through the lower half of the primary to ground, thus creating a negative voltage potential at the lower primary end with regards to the VIN potential at the center-tap.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 Fortunately, due to the positive temperature coefficient of a MOSFET’s on-resistance, the output FETs of the SN6501 have a self-correcting effect on V-t imbalance. In the case of a slightly longer on-time, the prolonged current flow through a FET gradually heats the transistor which leads to an increase in RDS-on. The higher resistance then causes the drain-source voltage, VDS, to rise.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com Table 1. Required maximum LDO Input Voltages for Various Push-pull Configurations PUSH-PULL CONVERTER LDO CONFIGURATION VIN-max [V] TURNS-RATIO VS-max [V] VI-max [V] 3.3 VIN to 3.3 VOUT 3.6 1.5 ± 3% 5.6 6 to 10 3.3 VIN to 5 VOUT 3.6 2.2 ± 3% 8.2 10 5 VIN to 5 VOUT 5.5 1.5 ± 3% 8.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 TRANSORMER SELECTION V-t Product Calculation To prevent a transformer from saturation its V-t product must be greater than the maximum V-t product applied by the SN6501. The maximum voltage delivered by the SN6501 is the nominal converter input plus 10%. The maximum time this voltage is applied to the primary is half the period of the lowest frequency at the specified input voltage.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 Table 2. Recommended Isolation Transformers Optimized for SN6501 Turns Ratio VxT (Vμs) Isolation (VRMS) Dimensions (mm) Application LDO Figures Order No. 1:1.1 11 2500 6.73 x 10.05 x 4.19 5V → 5V No Figure 3 Figure 4 760390012 1:1.1 7 2500 6.73 x 10.05 x 4.19 3.3V → 3.3V No Figure 5 Figure 6 760390011 1:1.7 11 2500 6.73 x 10.05 x 4.19 3.3V → 5V No Figure 7 Figure 8 760390013 1:1.1 11 5000 9.14 x 12.7 x 7.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com HIGHER OUTPUT VOLTAGE DESIGNS The SN6501 can drive push-pull converters that provide high output voltages of up to 30 V, or bipolar outputs of up to ±15 V. Using commercially available center-tapped transformers, with their rather low turns ratios of 0.8 to 5, requires different rectifier topologies to achieve high output voltages.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 VS 3.3V 10 µF 2 Vcc D2 1:2.2 MBR0520L 3 1 SN6501 D1 IN OUT 5 ISO 5V TPS76350 10µF 0.1µF 3 1 EN GND 10µF 2 MBR0520L GND2 GND1 4 5 ISO-BARRIER 0.1µF 0.1µF 0.1µF 1µF 1 Vcc1 7,17,22 5 9 10 6MHz 6 18pF 18pF 1µF RST VDD OSC0 STELLARIS OSC1 LDO 0.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com VS 10 µF 3.3V 2 Vcc D2 1:2.2 MBR0520L 3 1 SN6501 OUT ISO 5V 5 TPS76350 10µF 0.1µF D1 IN 3 EN 1 GND 10µF 2 MBR0520L GND2 GND1 5 4 ISO-BARRIER 0.1µF* 0.1µF 18pF 18pF 10* 0.1µF* 4 8 1 40 12* 3 37 VDDC RST VDD VDDA VBAT 25 30 CAN0Rx OSC0 STELLARIS 31 26 OSC1 LM3S5Y36 CAN0Tx 7 LDO GND GNDA WAKE 9* 6MHz 0.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 VIN 0.1µF 2 Vcc D2 3 HV Supply bus 1:2.2 MBR0520L 1 5 VISO 5 OUT 3.3µF IN SN6501 GND D1 10µF 0.1µF 3 ON 1 10 µF 4,5 15 BP 4 GND 2 10 nF MBR0520L 4 6 8 10 0.1µF 12 0.1µF 17 0.1µF 19 16 1 2 7 DVcc 5 6 XOUT XIN P3.0 11 3 14 4 MSP430 UCB0CLK F2132 UCB0SOMI 13 P3.1 DVss 12 4 5 6 Vcc1 EN1 EN2 INA OUTA INB 21 Vcc2 ISO7242 OUTB INC OUTC IND GND2 OUTD GND1 2,8 10 V..34 V 0V 0.
SN6501 SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 www.ti.com VS 3.3V 0.1µF 2 Vcc D2 3 1:2.2 MBR0520L 1 SN6501 GND D1 IN 5 VISO 5 3 ON 1 GND 0.1µF 8 10 µF LP2981-50 10 µF 0.1µF 9 2 10 1W 10 µF 4,5 OUT 1 MBR0520L VDD SDA ADDR 0.1µF 0.1µF 1.5k GND RDY 1.5k 5 6 DVcc XOUT SDA MSP430 G2132 XIN SCL 9 2 8 3 DVss Vcc1 SDA1 11 10 Vcc2 ISO1541 SCL1 GND1 4 1.5 k SDA2 SCL2 GND2 4 7 7 9 6 14 6 22 µF 15 8 1 AIN3 2 0.1µF 0.1µF 1.
SN6501 www.ti.com SLLSEA0F – FEBRUARY 2012 – REVISED AUGUST 2013 REVISION HISTORY Changes from Original (February 2012) to Revision A Page • Changed the device From: Product Preview To: Production ................................................................................................ 1 • Added Figure 31 through Figure 34 ...................................................................................................................................... 9 • Changed Equation 8 .............
PACKAGE OPTION ADDENDUM www.ti.
PACKAGE OPTION ADDENDUM www.ti.
PACKAGE MATERIALS INFORMATION www.ti.com 31-Dec-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) SN6501DBVR SOT-23 DBV 5 3000 178.0 9.0 SN6501DBVT SOT-23 DBV 5 250 178.0 9.0 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.3 3.2 1.4 4.0 8.0 Q3 3.3 3.2 1.4 4.0 8.
PACKAGE MATERIALS INFORMATION www.ti.com 31-Dec-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN6501DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 SN6501DBVT SOT-23 DBV 5 250 180.0 180.0 18.
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
