UC1625

UC2625

UC3625

SLUS353A - NOVEMBER 1999

Brushless DC Motor Controller

FEATURES

•

Drives Power MOSFETs or Power Darlingtons

Directly

•

50V Open Collector High-Side Drivers

•

Latched Soft Start

•

High-speed Current-Sense Amplifier with Ideal

Diode

•

Pulse-by-Pulse and Average Current Sensing

•

Over-Voltage and Under-Voltage Protection

•

Direction Latch for Safe Direction Reversal

•

Tachometer

•

Trimmed Reference Sources 30mA

•

Programmable Cross-Conduction Protection

• Two-Quadrant and Four-Quadrant Operation

DESCRIPTION

The UC3625 family of motor controller ICs integrate most of the

functions required for high-performance brushless DC motor con

trol into one package. When coupled with external power

MOSFETs or Darlingtons, these ICs perform fixed-frequency PWM

motor control in either voltage or current mode while implementing

closed loop speed control and braking with smart noise rejection,

safe direction reversal, and cross–conduction protection.

Although specified for operation from power supplies between 10V

and 18V, the UC1625 can control higher voltage power devices

with external level-shifting components. The UC1625 contains fast,

high-current push-pull drivers for low-side power devices and 50V

open-collector outputs for high-side power devices or level shifting

circuitry.

The UC1625 is characterized for operation over the military tem

perature range of –55°C to +125°C, while the UC2625 is charac

terized from –40°C to +105°C and the UC3625 is characterized

from 0°C to 70°C.

(NOTE: ESD Protection to 2kV)

application

INFO

available

UDG-99045

24326

10kΩ

3kΩ

10kΩ

2 19

20µF

100nF

20µF

100nF

OSC

33kΩ

2200pF

OSC

68kΩ

3nF

BRAKE

5nF 100nF

23 8 9 10 4 5 7

2nF

100nF

10kΩ

5nF

240Ω

3kΩ

2N3906

100nF

4kΩ

TO OTHER

CHANNELS

TO OTHER

CHANNELS

10Ω

2N3904

10Ω

IRF9350

IRF532

3kΩ

FROM

HALL

SENSORS

VMOTOR+15V

+5V TO HALL

SENSORS

VREF

0.02Ω

MOTOR

0.02Ω

REQUIRED

FOR

AVERAGE

CURRENT

SENSING

REQUIRED

FOR BRAKE

AND FAST

REVERSE

100µF

UC3625

DIR

QUAD

TYPICAL APPLICATION

UC1625

UC2625

UC3625

VCC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V

Pwr V

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . +20V

PWM In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 6V

E/A IN(+), E/A IN(–) . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 12V

SENSE1

, I

SENSE2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1.3 to 6V

OV–Coast, Dir, Speed-In, S

START, Quad Sel . . . . . . –0.3 to 8V

H1, H2, H3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 12V

PU Output Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 50V

PU Output Current . . . . . . . . . . . . . . . . . . +200 mA continuous

PD Output Current . . . . . . . . . . . . . . . . . .

200 mA continuous

E/A Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 mA

SENSE

Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . –10 mA

Tach Out Output Current . . . . . . . . . . . . . . . . . . . . . . . .

10 mA

REF

Output Current . . . . . . . . . . . . . . . . . . –50 mA continuous

Operating Temperature Range UC1625. . . . . . –55°C to 125°C

Operating Temperature Range UC2625. . . . . . –40°C to 105°C

Operating Temperature Range UC3625. . . . . . . . . 0°C to 70°C

Note 1: Currents are positive into and negative out of the spec

ified terminal.

Note 2: Consult Unitrode Integrated Circuits databook for infor

mation regarding thermal specifications and limitations

of packages.

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for: T

= 25°C; Pwr V

= V

= 12V;

OSC

20k to V

REF

; C

OSC

= 2nF; R

TACH

= 33k; C

TACH

= 10nF; and all outputs unloaded. T

= T

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Overall

Supply current Over Operating Range 14.5 30.0 mA

Turn-On Threshold Over Operating Range 8.65 8.95 9.45 V

Turn-Off Threshold Over Operating Range 7.75 8.05 8.55 V

Overvoltage/Coast

OV-Coast Inhibit Threshold Over Operating Range 1.65 1.75 1.85 V

OV-Coast Restart Threshold 1.55 1.65 1.75 V

OV-Coast Hysteresis 0.05 0.10 0.15 V

OV-Coast Input Current –10 –1 0 µA

Logic Inputs

H1, H2, H3 Low Threshold Over Operating Range 0.8 1.0 1.2 V

H1, H2, H3 High Threshold Over Operating Range 1.6 1.9 2.0 V

H1, H2, H3 Input Current Over Operating Range, to 0V -400 -250 –120 µA

Quad Sel, Dir Thresholds Over Operating Range 0.8 1.4 2.0 V

Quad Sel Hysteresis 70 mV

Dir Hysteresis 0.6 V

Quad Sel Input Current –30 50 150 µA

Dir Input Current –30 –1 30 µA

PWM Amp/Comparator

E/A In(+), E/A In(–) Input Current To 2.5V –5.0 –0.1 5.0 µA

PWM In Input Current To 2.5V 0 3 30 µA

Error Amp Input Offset 0V < V

COMMON-MODE

< 3V –10 10 mV

Error Amp Voltage Gain 70 90 dB

CONNECTION DIAGRAM

Note 3: This pinout applies to the SOIC (DW), PLCC (Q), and

LCC (L) packages (ie. pin 22 has the same function on all

packages.)

DIL-28 (TOP VIEW)

J or N PACKAGE

UC1625

UC2625

UC3625

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for: T

= 25°C; Pwr V

= V

= 12V;

OSC

20k to V

REF

; C

OSC

= 2nF; R

TACH

= 33k; C

TACH

= 10nF; and all outputs unloaded. T

= T

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

PWM Amp/Comparator (cont.)

E/A Out Range 0.25 3.50 V

START

Pull-up Current To 0V –16 –10 –5 µA

START

Discharge Current To 2.5V 0.1 0.4 3.0 mA

START Restart Threshold

0.1 0.2 0.3 V

Current Amp

Gain I

SENSE1

= .3V, I

SENSE2

= .5V to .7V 1.75 1.95 2.15 V/V

Level Shift I

SENSE1

= .3V, I

SENSE2

= .3V 2.4 2.5 2.65 V

Peak Current Threshold I

SENSE1

= 0V, Force I

SENSE2

0.14 0.20 0.26 V

Over Current Threshold I

SENSE1

= 0V, Force I

SENSE2

0.26 0.30 0.36 V

SENSE1

, I

SENSE2

Input Current To 0V –850 –320 0 µA

SENSE1

, I

SENSE2

Offset Current To 0V

12 µA

Range I

SENSE1

, I

SENSE2

–1 2 V

Tachometer/Brake

Tach-Out High Level Over Operating Range, 10k to 2.5V 4.7 5 5.3 V

Tach-Out Low Level Over Operating Range, 10k to 2.5V 0.2 V

On Time 170 220 280 µs

On Time Change With Temp Over Operating Range 0.1 %

RC-Brake Input Current To 0V –4.0 –1.9 mA

Threshold to Brake, RC-Brake Over Operating Range 0.8 1.0 1.2 V

Brake Hysteresis, RC-Brake 0.09 V

Speed-In Threshold Over Operating Range 220 257 290 mV

Speed-In Input Current –30 –5 30 µA

Low-Side Drivers

Voh, –1mA, Down From V

Over Operating Range 1.60 2.1

V Voh, –50mA, Down From V

Over Operating Range 1.75 2.2 V

Vol, 1mA Over Operating Range 0.05 0.4 V

Vol, 50mA Over Operating Range 0.36 0.8 V

Rise/Fall Time 10% to 90% Slew Time, into 1nF 50 ns

High-Side Drivers

Vol, 1mA Over Operating Range 0.1 0.4 V

Vol, 50mA Over Operating Range 1.0 1.8 V

Leakage Current Output Voltage = 50V 25 µA

Fall Time 10% to 90% Slew Time, 50mA Load 50 ns

Oscillator

Frequency 40 50 60 kHz

Frequency Over Operating Range 35 65 kHz

Reference

Output Voltage 4.9 5.0 5.1 V

Output Voltage Over Operating Range 4.7 5.0 5.3 V

Load Regulation 0mA to –20mA Load –40 –5 mV

Line Regulation 10V to 18V V

–10 –1 10 mV

Short Circuit Current Over Operating Range 50 100 150 mA

Part #	UC2625Q
Description	BRUSHLESS DC MTR CONTROL28-PIN PLCC
Category	IC
Availability	Out of Stock
Qty	0

UC2625Q

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Technical Document