Diodes ZXGD3103N8 User Manual

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f

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Product Line o

Diodes Incorporated

ZXGD3103N8

SYNCHRONOUS MOSFET CONTROLLER

Description

The ZXGD3103 is intended to drive MOSFETS configured as ideal diode replacements. The device is comprised of a differential amplifier detector stage and high current driver. The detector monitors the reverse voltage of the MOSFET such that if body diode conduction occurs a positive voltage is applied to the MOSFET’s Gate pin.

Features

• Proportional Gate Drive

• Turn-off propagation delay 15ns and turn-off

time 20ns.

• Detector threshold voltage ~10mV

• Standby current 5mA

• Suitable for Discontinuous Mode (DCM),

Critical Conduction Mode (CrCM) and Continuous Mode (CCM) operation

• 5-15V V

range

CC

Once the positive voltage is applied to the Gate the MOSFET switches on allowing reverse current flow. The detectors’ output voltage is then proportional to the MOSFET Drain-Source reverse voltage drop and this is applied to the Gate via the driver. This action provides a rapid turn off as current decays.

Applications

• Flyback Converters in:

• Adaptors

• LCD Monitors

• Server PSU’s

• Set Top Boxes

• LCD TV

• Resonant Converters

• LED TV

• High power Adaptors

• Street Lighting

• ATX psu

Pin out details

Typical Configuration

SO-8

Ordering information

Device Status Package Part Mark

Reel size

(inches)

Tape width

(mm)

Quantity per reel

ZXGD3103N8TC Production SO8 ZXGD3103 13 12 2500

Marking information

ZXGD

3103 Y W

ZXGD = Product Type Marking Code, Line 1 3103 = Product Type Marking Code, Line 2 YY = Year (ex: 11 = 2011) WW = Week (01 - 53)

ZXGD3103N8

Document number: DS32255 Rev. 2 - 2

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Absolute maximum ratings

Parameter Symbol Limit Unit

Supply voltage1 V Continuous Drain pin voltage1 V GATEH and GATEL output Voltage1 V Driver peak source current I Driver peak sink current I Reference current I Bias voltage V Bias current I Power dissipation at TA =25°C

15 V

CC

-3 to180 V

D

-3 to V

G

2.5 A

SOURCE

6 A

SINK

25 mA

REF

V

BIAS

100 mA

BIAS

P

490 mW

D

+ 3 V

CC

V

CC

Operating junction temperature Tj -40 to +150 Storage temperature T

Notes: 1. All voltages are relative to GND pin.

-50 to +150

stg

Thermal resistance

°C °C

Parameter Symbol Value Unit

Junction to ambient (a) R

Junction to lead (b) R

Notes: a. Mounted on minimum 1oz weight copper on FR4 PCB in still air conditions.

b. Output Drivers - Junction to solder point at end of the lead 5 and 6

255 °C/W

θJA

120 °C/W

θlA

ESD Rating

Model Rating Unit

Human Body 2000 V Machine 300 V

ZXGD3103N8

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Electrical characteristics at TA = 25°C; VCC = 10V; R

Parameter Symbol Conditions Min. Typ. Max. Unit Input and supply characteristics

≤ -200m V - 2.16 -

V

Operating current IOP

Gate Driver

Turn-off Threshold Voltage(**)

V

T

V

G(off)

GATE output voltage (**)

VG

D

VD ≥ 0V - 5.16 -

V

= 1V, (*)

G

V

≥ 0V, (*)

D

= -50mV, (g)

V

D

VD = -100mV, (g) VD ≤ -150mV, (g)

= 3.3kΩ; R

BIAS

= 4.3kΩ

REF

mA

-16 -10 0 mV

- 0.73 1

6.0 7.2 -

8.8 9.2 -

V

9.2 9.4 -

VD ≤ -200mV, (g)

9.3 9.5 -

Switching performance (“) for QG(tot) = 82nC

Turn on Propagation delay t Turn off Propagation delay td2 15

d1

Refer to switching waveforms in Fig. 3

150

Gate rise time tr 450 Gate fall time tf

Notes:

(**) GATEH connected to GATEL (*) R

= 100kΩ, RL = O/C

H

= 100kΩ, RH = O/C

(g) R

L

Continuous Conduction Mode Discontinuous Conduction

Mode

21

17

(“) refer to test circuit below

ns

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Schematic Symbol and Pin Out Details

Pin No. Name Description and function

1 2

3 GATEL

4

NC No Internal connection REF

Reference

This pin is connected to V

Gate turn off

GATEH

This pin sinks current, I

Gate turn on

This pin sources current, I

SINK

Power Supply

5 VCC

This is the supply pin. It is recommended to decouple this point to ground closely with a ceramic capacitor.

Ground

6 GND

This is the ground reference point. Connect to the synchronous MOSFET Source terminal.

7 BIAS

8

DRAIN

Bias

This pin is connected to V

Drain connection

This pin connects directly to the synchronous MOSFET Drain terminal.

via resistor, R

CC

REF

, from the synchronous MOSFET Gate.

, to the synchronous MOSFET Gate.

SOURCE

via resistor, R

CC

BIAS

.

ZXGD3103N8

Document number: DS32255 Rev. 2 - 2

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November 2011