ALLEGRO 3940 User Manual

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查询A3940KLP-T供应商

FULL-BRIDGE POWER MOSFET CONTROLLER

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A3940KLP

(TSSOP with exposed

thermal pad)

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A3940KLW

(SOIC)

29319.100i

Data Sheet

3940

— For Automotive Applications

The A3940KLP and A3940KLW are designed specifically for

automotive applications that require high-power motors. Each provides

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four high-current gate drive outputs capable of driving a wide range of
n-channel power MOSFETs in a full-bridge configuration.

Bootstrap capacitors are utilized to provide the above-battery
supply voltage required for n-channel FETs. An internal charge pump
for the high side allows for dc (100% duty cycle) operation of the
bridge.

Protection features include supply under/overvoltage, thermal
shutdown, and motor lead short-to-battery and short-to-ground fault
notification, and a programmable dead-time adjustment for cross­conduction prevention.

The overvoltage trip point is user adjustable.

Approx. 2X actual size.

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage Range, VBB,

VDRAIN, CP1 .......... -0.6 V to +40 V

Output Voltage Ranges,

LSS.............................. -2 V to +6.5 V

GHA/GHB, V

SA/SB, VSX.................. -2 V to +45 V

GLA/GLB, V

CA/CB, VCX.............. -0.6 V to +55 V

CP2,VCP, VIN.......... -0.6 V to +52 V

Logic Input/Output Voltage Range

VIN, V

................... -0.3 V to +6.5 V

OUT

Operating Temperature Range,

TA........................... -40°C to +135°C

Junction Temperature, TJ......... +150°C*

Storage Temperature Range,

TS........................... -55°C to +150°C

* Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions

can be tolerated, but should be avoided.

........ -2 V to +55 V

GHX

.......... -2 V to +16 V

GLX

The A3940 is supplied in a choice of two power packages, a 28-pin
TSSOP with an exposed thermal pad (package type LP), and a 28-pin
wide-body SOIC (package type LW). Both package types are available
in lead (Pb) free versions, with 100 % matte-tin leadframe plating
(suffix –T).

FEATURES



 Drives wide range of n-channel MOSFETs




 Charge pump to boost gate drive at low-battery-input conditions




 Bootstrapped gate drive with charge pump for 100% duty cycle




 Synchronous rectification




 Fault diagnostic output




 Adjustable dead-time cross-conduction protection


 Motor lead short-to-battery and short-to-ground protection
 Undervoltage/overvoltage protection


 -40°C to +150°C, T




 Thermal shutdown



Always order by complete part number

Part Number Pb-free Package

A3940KLP-T Yes 28-pin TSSOP
A3940KLP – 28-pin TSSOP
A3940KLW-T Yes 28-pin SOICW
A3940KLW – 28-pin SOICW

operation

J

3940

FULL-BRIDGE POWER
MOSFET CONTROLLER

Functional Block Diagram

See pages 7 and 8 for terminal assignments and descriptions.

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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 2003 Allegro MicroSystems, Inc.

3940

FULL-BRIDGE POWER

MOSFET CONTROLLER

A3940KLW (SOIC)A3940KLP (TSSOP)

* Measured on “High-K” multi-layer PWB per JEDEC Standard JESD51-7.
† Measured on typical two-sided PWB .

The products described here are manufactured under one or more

U.S. patents or U.S. patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.

The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi­bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.

www.allegromicro.com

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3940

FULL-BRIDGE POWER
MOSFET CONTROLLER

ELECTRICAL CHARACTERISTICS: unless otherwise noted at T

≤≤

VIN

≤ V

= 7 V to 40 V, Cp = 0.47 µF, Cr = 1 µF, C

≤≤

BB

= 0.1 µF, C

REG5

= -40°C to +135°C, TJ = -40°C to +150°C,

A

REG13

= 10 µF, C

= 0.1 µF, PWM = 22.5 kHz

BOOT

square wave.

Limits

Characteristics Symbol Conditions Min Typ Max Units

Power Supply

V

Quiescent Current I

BB

VREG5 Output Voltage V
VREG5 Line Regulation V
VREG5 Load Regulation V
VREG5 Short-Circuit Current I
VCP Output Voltage Level V

VCP Gate Drive I
VCP Output Voltage Ripple V
VCP Pump-Up time t

VREG13 Quiescent Input Current I
VREG13 Output Voltage V
VREG13 Dropout Voltage V
VREG13 Line Regulation V
VREG13 Load Regulation V
VREG13 Short-Circuit Current I
Go-to-Sleep Response Time t
Wake-Up Response Time t

BB

REG5
REG5
REG5

REG5M

CP

CP

CP(PP)

up

REG13

REG13
REGDV
REG13
REG13

REG13M

sleep
wake

NOTES: Typical Data is for design information only.

Negative current is defined as coming out of (sourcing) the specified device terminal.

RESET = 1, V
coast, stopped, CP disabled, I

RESET = 1, V
coast, stopped, CP disabled, I

RESET = 1, V
stopped, I

RESET = 1, V
stopped, I

RESET = 1, V
stopped, I

RESET = 1, V
stopped, I

= V

BB

BB

BB

DEAD

BB

= 170 µA, ICP = 0 mA

DEAD

BB

DEAD

BB

= 170 µA, ICP = 15 mA

DEAD

= 40 V, VIN ≠ VCP, – 4.8 7.0 mA

IN

DEAD

= 170 µA

= VIN = 15 V, VIN ≠ VCP, – 4.3 7.0 mA

= 170 µA

DEAD

= V

= 40 V, VIN ≠ VCP, coast, – 5.0 7.0 mA

IN

= 170 µA, ICP = 0 mA

= V

= 15 V, VIN ≠ VCP, coast, – 4.8 7.0 mA

IN

= V

= 40 V, VIN ≠ VCP, coast, – 35.4 40.0 mA

IN

= 170 µA, ICP = 15 mA

= V

= 15 V, VIN ≠ VCP, coast, – 35.1 40.0 mA

IN

RESET = 0 – – 1.0 µA
No load 4.5 5.0 5.5 V
I

= 4.0 mA – 5.0 – mV

REG5

I

= 0 - 4.0 mA, VBB = 40 V – 5.0 – mV

REG5

VBB = 40 V, V
VBB = 14 - 40 V, ICP = 15 mA
V

= 7 V, ICP = 15 mA 11.7 13 13.8 V

BB

= 0 – 28 – mA

REG5

VBB+9.5 VBB+10.7 VBB+11.8

V

SR = 1, MODE = 0, ENABLE = PWM 15 – – mA
ICP = 15 mA, VBB = 14 V - 40 V – 500 – mV
VIN = VCP, VBB = 14 V - 40 V – 2.5 – ms
VIN = VCP, VBB = 7 V – 3.5 – ms
RESET = 1, V
V

= 15 V, no load 12.6 13.3 14.0 V

IN

I

= 15 mA, VIN = 11 V - 14 V – 0.7 – V

REG13

VIN = 15 V - 40 V, I
VIN = 40 V, I
VIN = 40 V, V
RESET = 0 to V
RESET = 1 to V

= V

BB

REG13

REG13

= 40 V, coast, stopped – 1.4 – mA

IN

= 15 mA – 2.0 – mV

REG13

= 0 - 15 mA – 2.0 – mV

= 0 (pulse) – 60 – mA

= 4 V 10 30 – µs

REG5

, UV cleared – 1.4 – ms

REG13

Continued next page …

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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]