L6571 High voltage half bridge driver with oscillator Features ■ High voltage rail up to 600 V ■ BCD off line technology ■ 15.6 V Zener clamp on Vs ■ Driver current capability: – Sink current = 270 mA – Source current = 170 mA DIP-8 SO8 can be programmed using external resistor and capacitor. ■ Very low start up current: 150 mA ■ Undervoltage lockout with hysteresis ■ Programmable oscillator frequency ■ Dead time 1.25 μs (L6571A) or 0.72 μs (L6571B) ■ dV/dt immunity up to ±50 V/ns ■ ESD protection The internal circuitry of the device allows it to be driven also by external logic signal. The output drivers are designed to drive external nchannel power MOSFET and IGBT. The internal logic assures a dead time to avoid crossconduction of the power devices. Two version are available: L6571A and L6571B. They differ in the internal dead time: 1.25μs and 0.72 μs (typ.) Description The device is a high voltage half bridge driver with built in oscillator. The frequency of the oscillator Figure 1. Block diagram +9 5+9 &96 96 %227 %,$6 5(*8/$725 /(9(/ 6+,)7(5 %8))(5 5) &) 287 /2$' &203 96 &) &203 *1' &%227 +,*+ 6,'( '5,9(5 96 5) +9* /2*,& /2:6,'( '5,9(5 /9* ',1 January 2010 Doc ID 4946 Rev 6 1/12 www.st.com 12 Contents L6571A - L6571B Contents 1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Oscillator frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Order information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 Doc ID 4946 Rev 6 L6571A - L6571B Maximum ratings 1 Maximum ratings 1.1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Value Unit Supply current 25 mA VCF Oscillator resistor voltage 18 V VLVG Low side switch gate output 14.6 V VOUT High side switch source output -1 to VBOOT -18 V VHVG High side switch gate output -1 to VBOOT V VBOOT Floating supply voltage 618 V VBOOT/OUT Floating supply vs OUT voltage 18 V dVBOOT/dt VBOOT slew rate (Repetitive) ± 50 V/ns dVOUT/dt VOUT slew rate (Repetitive) ± 50 V/ns IS (1) Parameter Tstg Storage temperature -40 to 150 °C TJ Junction temperature -40 to 150 °C Ambient temperature (Operative) -40 to 125 °C Tamb 1. The device has an internal zener clamp between GND and VS (typical 15.6 V).Therefore the circuit should not be driven by a DC low impedance power source. Note: ESD immunity for pins 6, 7 and 8 is guaranteed up to 900 V (human body model) 1.2 Thermal data Table 2. Thermal data Symbol RthJA 1.3 Parameter Thermal resistance junction-ambient max MDIP8 SO8 Unit 100 150 °C/W Min. Max. Unit 10 VCL V Recommended operating conditions Table 3. Recommended operating conditions Symbol VS Parameter Supply voltage VBOOT Floating supply voltage - 500 V VOUT High side switch source output -1 VBOOT -VCL V 200 kHz fout Oscillation frequency Doc ID 4946 Rev 6 3/12 Pin connection 2 L6571A - L6571B Pin connection Figure 2. Pin connection 96 %227 5) +9* &) 287 *1' /9* ',1 Table 4. 4/12 Pin description N° Pin Description 1 VS Supply input voltage with internal clamp [typ. 15.6V] 2 RF Oscillator timing resistor pin. A buffer set alternatively to VS and GND can provide current to the external resistor RF connected between pin 2 and 3. Alternatively, the signal on pin 2 can be used also to drive another IC (i.e. another L6569/71 to drive a full H-bridge) 3 CF Oscillator timing capacitor pin. A capacitor connected between this pin and GND fixes (together with RF) the oscillating frequency Alternatively an external logic signal can be applied to the pin to drive the IC. 4 GND Ground 5 LVG Low side driver output. The output stage can deliver 170mA source and 270mA sink [typ.values]. 6 OUT Upper driver floating reference 7 HVG High side driver output. The output stage can deliver 170mA source and 270mA sink [typ.values]. 8 BOOT Bootstrap voltage supply. It is the upper driver floating supply. Doc ID 4946 Rev 6 L6571A - L6571B 3 Electrical data Electrical data VS = 12V; VBOOT - VOUT = 12V; Tj = 25 °C; unless otherwise specified. Table 5. Electrical characteristcs Symbol Pin VSUVP 1 Parameter Test Condition Min. Typ. Max. Unit VS turn on threshold 8.3 9 9.7 V VSUVN VS turn off threshold 7.3 8 8.7 V VSUVH VS hysteresis 0.7 1 1.3 V 14.6 15.6 16.6 V VCL VS clamping voltage IS = 5 mA ISU Start up current VS < VSUVN 150 250 μA Quiescent current VS > VSUVP 500 700 μA Iq IBOOTLK 8 Leakage current BOOT pin vs GND VBOOT = 580V 5 μA IOUTLK 6 Leakage current OUT pin vs GND VOUT = 562V 5 μA IHVG SO 7 High side driver source current VHVG = 6V 110 175 mA High side driver sink current VHVG = 6V 190 275 mA Low side driver source current VLVG = 6V 110 175 mA Low side driver sink current VLVG = 6V 190 275 mA RF high level output voltage IRF =1mA VS -0.05 VS -0.2 V RF low level output voltage IRF = -1mA 50 200 mV IHVG SI ILVG SO 5 ILVG SI VRFON 2 VRF OFF CF upper threshold 7.7 8 8.2 V VCFL CF lower threshold 3.80 4 4.3 V td Internal dead time 0.85 0.50 1.25 0.72 1.65 0.94 μs μs 0.45 0.5 0.55 1.2 1.5 mA 60 63 kHz VCFU 3 L6571A L6571B Duty cycle, ratio between dead Time + conduction time of high Side and low side drivers DC IAVE 1 Average current from Vs No Load, fs = 60KHz fout 6 Oscillation frequency RT = 12K; CT = 1nF Doc ID 4946 Rev 6 57 5/12 Oscillator frequency 4 L6571A - L6571B Oscillator frequency The frequency of the internal oscillator can be programmed using external resistor and capacitor. The nominal oscillator frequency can be calculated using the following equation: Equation 1 Where RF and CF are the external resistor and capacitor. The device can be driven in "shut down" condition keeping the CF pin close to GND, but some cares have to be taken: 1. When CF is to GND the high side driver is off and the low side is on 2. The forced discharge of the oscillator capacitor CF must not be shorter than 1us: a simple way to do this is to limit the current discharge with a resistive path imposing R · CF > 1 μs (see fig.1) Figure 3. Fault signal &) *1'0 Figure 4. 5) 5 IDXOW VLJQDO Waveforms 96 96893 9&) /9* 7 6/12 7& Doc ID 4946 Rev 6 ',1 L6571A - L6571B Figure 5. Oscillator frequency Typical dead time vs. temperature dependency (L6571A) 'HDGWLPH>MVHF@ ',1$ Figure 6. Typical rise and fall times vs. load capacitance WLPH>QVHF@ ',1 7U Figure 7. 7HPSHUDWXUH>&@ &>Q)@ )RUERWKKLJKDQGORZVLGHEXIIHUV#Û&7DPE Typical frequency vs temperature dependency )UHTXHQF\>.+]@ ',1$ 7I Figure 8. Quiescent current vs. supply voltage ,T M$ ',1 Figure 9. 7HPSHUDWXUH >&@ 96 9 Typical and theoretical oscillator frequency vs resistor value I .+] ',1 7KHRUHWLFDO & S) & S) & Q) 5HVLVWRU9DOXH .RKP Doc ID 4946 Rev 6 7/12 Package mechanical data 5 L6571A - L6571B Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 10. DIP-8 mechanical data mm inch DIM. MIN. A TYP. MIN. 3.32 TYP. MAX. 0.51 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 E 0.020 10.92 7.95 9.75 0.430 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 I 5.08 0.200 L Z 3.18 OUTLINE AND MECHANICAL DATA 0.131 a1 D 8/12 MAX. 3.81 1.52 0.125 0.150 0.060 Doc ID 4946 Rev 6 DIP-8 L6571A - L6571B Package mechanical data Table 1. SO-8 mechanical data mm. inch Dim. Min Typ Max Min Typ Max A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 (1) 4.80 5.00 0.189 0.197 E 3.80 4.00 0.15 0.157 D e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k 0° (min.), 8° (max.) ddd 0.10 0.004 1. Dimensions D does not include mold flash, protru-sions or gate burrs. Mold flash, potrusions or gate burrs shall not exceed 0.15mm (.006inch) in total (both side). Figure 11. Package dimensions Doc ID 4946 Rev 6 9/12 Order information 6 L6571A - L6571B Order information Table 6. Ordering information Order codes Package L6571A DIP-8 Packaging Tube L6571AD SO8 L6571AD013TR L6571B Tape and reel DIP-8 Tube L6571BD SO8 L6571BD013TR 10/12 Tape and reel Doc ID 4946 Rev 6 L6571A - L6571B 7 Revision history Revision history Table 7. Document revision history Date Revision Changes 14-Jan-2004 5 No history because migration 15-Jan-2010 6 Updated Table 6 on page 10 Doc ID 4946 Rev 6 11/12 L6571A - L6571B 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. 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