Datasheet

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This is information on a product in full production.

November 2013 DocID6554 Rev 8 1/23

L6598

High voltage resonant controller

Datasheet - production data

Features

 High voltage rail up to 600 V

 dV/dt immunity ±50 V/ns in full temperature

range

 Driver current capability: 250 mA source

450 mA sink

 Switching times 80/40 ns rise/fall with 1 nF load

 CMOS shutdown input

 Undervoltage lockout

 Soft-start frequency shifting timing

 Sense op amp for closed loop control or

protection features

 High accuracy current controlled oscillator

 Integrated bootstrap diode

 Clamping on Vs

 Available in DIP16 and SO16 packages

Description

The L6598 device is manufactured with the

BCD™ offline technology, able to ensure voltage

ratings up to 600 V, making it perfectly suited for

AC/DC adapters and wherever a resonant

topology can be beneficial. The device is intended

to drive two power MOSFETs, in the classical half

bridge topology. A dedicated timing section allows

the designer to set soft-start time, soft-start and

minimum frequency. An error amplifier, together

with the two enable inputs, are made available. In

addition, the integrated bootstrap diode and the

Zener clamping on low voltage supply, reduces to

a minimum the external parts needed in the

applications.

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Summary of content (23 pages)

PAGE 1
L6598 High voltage resonant controller Datasheet - production data  Sense op amp for closed loop control or protection features  High accuracy current controlled oscillator  Integrated bootstrap diode  Clamping on Vs  Available in DIP16 and SO16 packages 62 1 ',3 Description The L6598 device is manufactured with the BCD™ offline technology, able to ensure voltage ratings up to 600 V, making it perfectly suited for AC/DC adapters and wherever a resonant topology can be beneficial.
PAGE 2
Contents L6598 Contents 1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Block diagram description . . . . . . . . .
PAGE 3
L6598 1 Maximum ratings Maximum ratings Table 1. Absolute maximum ratings Symbol Parameter Value Unit 25 mA 14.6 V -1 to VBOOT -18 V -1 to VBOOT V 618 V ±50 V/ns ±50 V/ns Supply current at Vcl(1) IS VLVG Low side output VOUT High side reference VHVG High side output VBOOT Floating supply voltage dVBOOT/dt VBOOT pin slew rate (repetitive) dVOUT/dt OUT pin slew rate (repetitive) Vir Forced input voltage (pins Rfmin, Rfstart) -0.
PAGE 4
Electrical characteristics 2 L6598 Electrical characteristics VS = 12 V; VBOOT - VOUT = 12 V; TA = 25 °C Table 4. Electrical characteristics Symbol Pin Parameter Test condition Min. Typ. Max. Unit Supply voltage Vsuvp VS turn on threshold 10 10.7 11.4 V Vsuvn VS turn off threshold 7.3 8 8.7 V Vsuvh Supply voltage under voltage hysteresis Vcl 12 2.7 Supply voltage clamping 14.6 Isu Start up current VS < Vsuvn Iq Quiescent current, fout = 60 kHz, no load VS > Vsuvp 15.
PAGE 5
L6598 Electrical characteristics Table 4. Electrical characteristics (continued) Symbol Pin Vref 2, 4 td IVref Parameter Test condition Min. Typ. Max. Unit Voltage to current converters threshold 1.9 2 2.1 V 14 Deadtime between low and high side conduction 0.2 0.27 0.35 µs 2, 4 Reference current 120 A Timing section kss 1 Soft-start timing constant Css = 330 nF 0.115 0.15 0.185 s/µF 0.
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Pin connections 3 L6598 Pin connections Figure 2. Pin connections &VV 9%227 5IVWDUW +9* &I 287 5IPLQ 1 & 23287 96 23,1 /9* 23,1 *1' (1 (1 $0 Y Table 5. Pin description Pin no.
PAGE 7
L6598 4 Timing diagrams Timing diagrams Figure 3. EN2 timing diagram 96 I287 IVWDUW IPLQ (1 9&VV 766 766 $0 Y Figure 4.
PAGE 8
Timing diagrams L6598 Figure 5.
PAGE 9
L6598 Block diagram description 5 Block diagram description 5.1 High/low side driving section A high and low side driving section provide the proper driving to the external power MOS or IGBT. A high sink/source driving current (450/250 mA typ.) ensure fast switching times also when size for power MOS are used. The internal logic ensures a minimum deadtime to avoid cross conduction of the power devices. 5.2 Timing and oscillator section The device is provided of a soft-start function.
PAGE 10
Block diagram description L6598 At the startup (t = 0) the oscillator frequency is set by: Equation 3 1 1 I OSC  0  = I fmin + I fstart = V REF  -------------- + ---------------- R fmin R fstart At the end of the soft-start (t = TSS) the second term of eq.1 decreases to zero and the switching frequency is set only by Imin (i.e.
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L6598 Block diagram description The degree of approximation depends on the frequency value, but it remains very good in the range from 30 kHz to 100 kHz (Figure 8 to Figure 12). Figure 7.
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Block diagram description L6598 Figure 8. Typ. fmin vs. Rfmin at Cf = 470 pF Figure 9. Typ. (fstart-fmin) vs. Rfstar at Cf = 470 pF Figure 10. Typ. (fstart-fmin) vs. Rfstar at Cf = 470 pF Figure 11.
PAGE 13
L6598 Block diagram description Figure 12. Typ. (fstart-fmin) vs. Rfstar at Cf = 470 pF 5.3 Bootstrap section The supply of the high voltage section is obtained by means of a bootstrap circuitry. This solution normally requires a high voltage fast recovery diode for charging the bootstrap capacitor (Figure 13 - part a). In the device a patented integrated structure replaces this external diode.
PAGE 14
Block diagram description L6598 threshold voltage. At low frequency this drop is very small and can be neglected. Anyway increasing the frequency it must be taken in to account. In fact the drop, reducing the amplitude of the driving signal, can significantly increase the RDSON of the external power MOS (and so the dissipation).
PAGE 15
L6598 5.5 Block diagram description Comparators Two CMOS comparators are available to perform protection schemes. Short pulses ( 200 ns) on comparators input are recognized. The EN1 input (active high), has a threshold of 0.6 V (typical value) forces the device in a latched shut down state (e.g. LVG low, HVG low, oscillator stopped), as in the under voltage conditions. Normal operating conditions are resumed after a power-off power-on sequence. The EN2 input (active high), with a threshold of 1.
PAGE 16
Block diagram description 16/23 L6598 Figure 16. Typ. fmin vs. temperature Figure 17. Startup current vs. temperature Figure 18. Typ. fstart vs. temperature Figure 19. Quiescent current vs.
PAGE 17
L6598 Block diagram description Figure 20. Vs thresholds and clamp vs. temp. Figure 21. HVG source and sink current vs. temperature Figure 22. LVG source and sink current vs. temperature Figure 23. Soft-start timing constant vs.
PAGE 18
Block diagram description L6598 Figure 24.
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L6598 6 Package information Package information 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 25. Plastic DIP16 (0.25) package outline 3 & Table 6. Plastic DIP16 (0.25) package mechanical data Dimensions Symbol mm Min. a1 0.51 B 0.77 Typ inch Max. Min.
PAGE 20
Package information L6598 Figure 26. SO16 package outline ' Table 7. SO16 package mechanical data Dimensions Symbol mm Min. Typ A a inch Max. Typ. 1.75 1 0.1 0.25 a2 Max. 0.068 0.004 0.010 1.64 0.063 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M 0.62 S 20/23 Min.
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L6598 7 Ordering codes Ordering codes Table 8.
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Revision history 8 L6598 Revision history Table 9. Document revision history Date Revision Changes 21-Jun-2004 5 Changed the impagination following the new release of “corporate technical publication design guide”. Done a few of corrections in the text. 09-Sep-2004 6 Added ordering number for the tape and reel version, updated Table 4 on page 4 02-Oct-2009 7 Updated Table 4 on page 4 8 Added cross-reference in Section 5.
PAGE 23
L6598 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.