ST L9856 User Manual

L9856

High voltage high-side driver

Features

■High voltage rail up to 160 V

■dV/dt immunity ±50 V/nsec in full temperature range

■Driver current capability: 500 mA source,

500 mA sink

■Switching times 100 ns rise/fall with 2.5 nF load

■CMOS/TTL Schmitt trigger inputs with hysteresis

■Under voltage lock out

■Clamping on VCC

■Loading circuit for external Bootstrap capacitor

■Inverting input

■Reset circuitry

■SO-8 package

Table 1. Device summary

SO-8

Description

The L9856 is an high voltage device, manufactured with the BCD "OFF-LINE" technology.

It has the capability of driving N-Channel Power MOS transistors. The upper (floating) section is enabled to work with voltage rail up to 160 V. The logic Inputs are CMOS/TTL compatible for ease of interfacing with controlling devices.

Order code	Operating temp range, °C	Package	Packing
L9856	-40 to +125	SO-8	Tube
L9856TR	-40 to +125	SO-8	Tape and Reel

May 2008

Rev 2

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www.st.com

Contents	L9856

Contents

1 Block diagram andpin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

	1.1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
2	Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		6

2.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.5 Logic table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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L9856	List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 5. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 7. Logic table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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List of figures	L9856

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3. Input/output timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 4. Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 5. SO-8 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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L9856	Block diagram andpin description

1 Block diagram andpin description

1.1Block diagram

Figure 1. Block diagram

			VB
	Undervoltage	Pulse Filter
	RESET
	VB to VS	FLIP FLOP	HO
		Break before
VCC		Make
Undervoltage			VS
RESET VCC
to GND
			path
RES-	Level Shifter		Recharge
Logic	"ON"
		Delay
Pulse Filter	Level Shifter
IN-	"OFF"
GND

1.2Pin description

Figure 2. Pin connection (top view)

VCC	1	8	VB
IN-	2	7	HO
GND	3	6	NC
RESET-	4	5	VS

Table 2.	Pin function
Pin #	Pin name	Description
1	VCC	Driver supply, typical 5V
2	IN-	Driver control signal input (negative logic)
3	GND	Ground
4	RESET-	Driver enable signal input (negative logic)
5	VS	MOSFET source connection
6	NC	No connection (no bondwire)
7	HO	MOSFET gate connection
8	VB	Driver output stage supply

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