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AN994
Application note
L638xE application guide
Introduction
STMicroelectronics' L638xE is a versatile, high-voltage gate driver family of devices.
Developed using BCD offline technology, the L6384E, L6385E, L6386E, L6387E and
L6388E devices can operate with high voltage rails up to 600 V. The gate drivers provide all
the functions and current capability necessary for high- and low-side power MOSFETs and
IGBTs.
The devices can be used in all types of applications where high-voltage shifted control is
necessary; they have a relatively high driver current capability and are provided with an
internal patented circuitry that replaces the external bootstrap diode. This feature is
achieved by means of a high voltage DMOS, synchronously driven with the low-side gate
driver.
February 2009
Rev 7
1/25
www.st.com
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Summary of Contents for ST L638E Series
- Page 1 This feature is achieved by means of a high voltage DMOS, synchronously driven with the low-side gate driver. February 2009 Rev 7 1/25 www.st.com...
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Page 2: Table Of Contents
Contents AN994 Contents L6384E ........... . 4 L6385E . - Page 3 AN994 List of figures List of figures Figure 1. L6384E internal block diagram ..........5 Figure 2.
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Page 4: L6384E
L6384E AN994 L6384E The L6384E (depicted in Figure 1) is a half-bridge driver with an externally-adjustable dead time and shut-down function. To disable the driver, the control pin (DT/SD at pin 3) must be pulled down to below 0.5 V. The dead time can be set from 0.5 µs to 2.7 µs by placing a resistor between pin 3 and ground. -
Page 5: Figure 1. L6384E Internal Block Diagram
AN994 L6384E Figure 1. L6384E internal block diagram H.V. BOOT BOOTSTRAP DRIVER BOOT DRIVER DETECTION LOGIC LOAD LEVEL SHIFTER DEAD TIME DT/SD DRIVER Vthi AM03415v1 Figure 2. L6384E - schematic diagram of the evaluation circuit 5/25... -
Page 6: Figure 3. L6384E - Pcb And Component Layout Of The Evaluation Circuit
L6384E AN994 Figure 3. L6384E - PCB and component layout of the evaluation circuit Top view Bottom view AM03413v1 6/25... -
Page 7: L6385E
AN994 L6385E L6385E The L6385E (shown in Figure 4) is a high- and low-side configurable driver. It can control the high- and low-side outputs (HVG and LVG) seperately, through the two related logic inputs HIN and LIN. This device is provided with an undervoltage detection function in both the low voltage V supply and high-voltage bootstrapped supply. -
Page 8: Figure 4. L6385E - Internal Block Diagram
L6385E AN994 Figure 4. L6385E - internal block diagram Figure 5. L6385E - schematic diagram of the evaluation circuit 8/25... -
Page 9: Figure 6. L6385E - Pcb And Component Layout Of The Evaluation Circuit
AN994 L6385E Figure 6. L6385E - PCB and component layout of the evaluation circuit Top view Bottom view AM03414v1 9/25... -
Page 10: L6386E
L6386E AN994 L6386E The L6386E (shown in Figure 7) is a configurable driver based on the structure of the L6385E, with added functions. This device is available in DIP14 or SO-14 packages. The added shutdown function (active low) and the current sense comparator (0.5-V threshold) with diagnostic output, make this device particularly suitable for motion control applications with cycle-by-cycle current feedback. -
Page 11: Figure 7. L6386E - Internal Block Diagram
AN994 L6386E Figure 7. L6386E - internal block diagram Figure 8. L6386E - schematic diagram of the evaluation circuit 11/25... -
Page 12: Figure 9. L6386E - Pcb And Component Layout Of The Evaluation Circuit
L6386E AN994 Figure 9. L6386E - PCB and component layout of the evaluation circuit Top view Bottom view AM03417v1 12/25... -
Page 13: L6387E
AN994 L6387E L6387E The L6387E (shown in Figure 10) is based on the structure of the L6385E. It has two separate inputs and also includes an interlocking function to avoid both power switches from being unintentionally switched on at the same time (see Table The V turn-on and turn-off thresholds have been lowered to 6 and 5.5 V respectively... -
Page 14: Figure 10. L6387E - Internal Block Diagram
L6387E AN994 Figure 10. L6387E - internal block diagram Table 5. Truth table INPUT OUTPUT 14/25... -
Page 15: L6388E
AN994 L6388E L6388E The L6388E (see Figure 11) is based on the structure of the L6385E. It has two separate inputs that are 3.3-V compatible, a fixed dead time of approximately 320 ns and an interlocking function to avoid both power switches from being unintentionally switched on at the same time (seeTable The UVLO thresholds of V... -
Page 16: Figure 11. L6388E Internal Block Diagram
L6388E AN994 Figure 11. L6388E internal block diagram 16/25... -
Page 17: Bootstrap Driver
AN994 Bootstrap driver Bootstrap driver A bootstrap circuitry is required to supply the high voltage section. This function is normally accomplished by a high-voltage fast recovery diode (see Figure 12). In the L638xE, a patented integrated structure replaces the external diode. This structure is comprised of a high-voltage DMOS—driven synchronously with the low-side driver (LVG)—with a diode in series, as shown in Figure... -
Page 18: Figure 12. External Bootstrap Diode: Principle Schematic
Bootstrap driver AN994 For example, using a power MOSFET with a total gate charge of 30 nC, the drop on the bootstrap DMOS is about 1 V if T is 5 µs. charge In fact: 30 nC -------------- - 125 Ω 0.8 V ⋅... -
Page 19: Figure 14. External Charge Pump
AN994 Bootstrap driver Figure 14. External charge pump VBOOT Cboot 200nF L638x LOAD 330pF 33pF 33pF HCF4069UB 19/25... -
Page 20: Application Examples
Application examples AN994 Application examples This section provides several application suggestions that highlight the versatility and flexibility of this family of high- and low-side drivers. Their simplicity and compactness make these devices a cost-effective solution. For further information on these ICs, refer to the following documents. ●... -
Page 21: Figure 16. L6384E Dimmable Lamp Ballast
AN994 Application examples Figure 16. L6384E dimmable lamp ballast Figure 17. L6384E half bridge converter 21/25... -
Page 22: Figure 18. L6385E Horizontal Deflection Stage
Application examples AN994 Figure 18. L6385E horizontal deflection stage Figure 19. L6385E 2-switch forward converter 22/25... -
Page 23: Figure 20. L6385E Asymmetrical Half Bridge
AN994 Application examples Figure 20. L6385E asymmetrical half bridge Figure 21. L6386E h-bridge with cycle-by-cycle control 23/25... -
Page 24: Revision History
Revision history AN994 Revision history Table 7. Document revision history Date Revision Changes 09-Sep-2004 Minor text changes Added: Section 5: L6388E – L6384 replaced by L6384E, L6385 replaced by L6385E, L6386 17-Feb-2009 replaced by L6386E, L6387 replaced by L6387E, L6388 replaced by L6388E, L638x replaced by L638xE. - Page 25 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.
- Page 26 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: STMicroelectronics EVAL638X-KIT...
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