Motorola MC33092ADW Datasheet

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The MC33092A is specifically designed for voltage regulation and Load
Response Control (LRC) of diode rectified alternator charging systems, as
commonly found in automotive applications. The MC33092A provides load
response control of the alternator output current to eliminate engine speed
hunting and vibration due to sudden electrical loads which cause abrupt
torque loading of the engine at low RPM. Two load response rates are
selectable using Pin 11. The timing of the response rates is dependent on
the oscillator frequency .

In maintaining system voltage, the MC33092A monitors and compares
the system battery voltage to an externally programmed set point value and
pulse width modulates an N–channel MOSFET transistor to control the
average alternator field current.

• Forced Load Response Control (LRC) with Heavy Load Transitions

at Low RPM

• Capable of Regulating Voltage to ± 0.1 V @ 25°C

• Operating Frequency Selectable with One External Resistor

• < 0.1 V V ariation over Speed Range of 2000 to 10,000 RPM

• < 0.4 V V ariation over 10% to 95% of Maximum Alternator Output

• Maintains Regulation with External Loads as Low as 1.0 A

• Load Dump Protection of Lamp, Field Control Devices, and Loads

• Duty Cycle Limit Protection

• Provides High Side MOSFET Control of a Ground Referenced Field

Winding

• Controlled MOSFET and Flyback Diode Recovery Characteristics for

Minimum RFI

• < 2.0 mA Standby Current from Battery @ 25°C

• < 3.0 mA Standby Current from Battery Over Temperature Range

• Optional 2.5 or 10 sec. LRC Rate Control (Osc. Freq. = 280 kHz)

• Undervoltage, Overvoltage and Phase Fault (Broken Belt) Detection

Order this document by MC33092A/D



ALTERNATOR VOLTAGE

REGULATOR

SEMICONDUCTOR

TECHNICAL DATA

20

1

DW SUFFIX

PLASTIC PACKAGE

CASE 751D

(SO–20L)

PIN CONNECTIONS

Simplified Block Diagram

Sense

(Remote)

12

Supply

Reg

(Local)

10

Phase

Osc.

Adjust

2

7

Sense
Circuit

X1

Oscillator

FB UV V

1 19 20 8 14 13

MC33092A

Lost

Signal

Combiner

and Switch

Oscillator

Low

Pass

Buff

Filter

Counter

Prescaler

(24)

911

Counter

DAC

(28)

ref

Regulate

12

4

MOTOROLA ANALOG IC DEVICE DATA

O

V

ref

Bandgap

Reference

Bias

Undervoltage

Load Dump

Overvoltage

Control

Logic

Divide By
(1/12/48)

Rate

VCC1V

Power

8

Supply

Output
Control

Up/Down

Counter

(24)

Charge

Power

Up/Down

Circuit

Pump

Lamp

Control

Logic

Gnd

CC

156

3

17

18
Source

3
Lamp

Coll.

4
Lamp

Base
5

Gnd

Gnd

Adjust

V

ref

1
2
3
4
5
6
7

O

8
9

Filter Buffer

Remote Sense

Lamp Collector

Lamp Base

Oscillator

Gate

Oscillator

Phase

(Top View)

ORDERING INFORMATION

Operating

Device

MC33092ADW TA = – 35° to +125°C SO–20L

 Motorola, Inc. 1997 Rev 0

Temperature Range

V

20

ref

Undervoltage

19

Source

18

Gate

17

NC

16

Gnd

15

VCC1

14

VCC3

13

Supply

12

Regulation

1110

Rate

Package

1

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V

Load Dump Transient V oltage (Note 1) +V
Negative Voltage (Note 2) –V

Power Dissipation and Thermal Characteristics

Maximum Power Dissipation @ TA = 125°C P

Thermal Resistance, Junction–to–Ambient R
Operating Junction Temperature T
Operating Ambient Temperature Range T
Storage Temperature Range T

NOTE: ESD data available upon request.

MC33092A

bat
max

min

D

θJA

J

A

stg

24 V
40 V

–2.5 V

867 mW

75 °C/W

+150 °C
–35 to +125 °C
–45 to +150 °C

ELECTRICAL CHARACTERISTICS (External components per Figure 1, T

Characteristic Symbol Min Typ Max Unit

DC CHARACTERISTICS

Regulation Voltage V

(Determined by external resistor divider)
Regulation Voltage Temperature Coefficient T
Suggested Battery Voltage Operating Range V
Power Up/Down Threshold Voltage (Pin 3) V
Standby Current,

V

= 12.8 V, Ignition off, TA = 25°C I

bat

V

= 12.8 V, Ignition off, –35°C ≤ TA ≤ 125°C I

bat

Zero Temperature Coefficient Reference Voltage, (Pin 8) V
Band Gap Reference Voltage (Pin 20) V
Band Gap Reference Temperature Coefficient TC –13 –11 – 9.0 mV/°C
Sense Loss Threshold (Pin 2) S
Phase Detection Threshold Voltage (Pin 10) P
Phase Rotation Detection Frequency (Pin 10) P
Undervoltage Threshold (Pin 19) V
Overvoltage Threshold (Pin 2, or Pin 12 if Pin 2 is not used) V
Load Dump Threshold (Pin 2, or Pin 12 if Pin 2 is not used) V

SWITCHING CHARACTERISTICS

Fundamental Regulation Output Frequency, (Pin 17)

(Clock oscillator frequency divided by 4096)
Suggested Clock Oscillator Frequency Range, (Pin 9) f

(Determined by external resistor, RT, see Figure 6)
Duty Cycle (Pin 17)

At Start–up Start

During Overvoltage Condition OV
Low/High RPM Transition Frequency (Pin 10) LRC

LRC Duty Cycle Increase Rate

Low RPM Mode (LRC

Pin 11 = Open (Slow Rate)

Low RPM Mode (LRC

Pin 11 = Grounded (Fast Rate)

High RPM Mode (LRC

Pin 11 = Don’t Care (LRC Mode is disabled)

NOTES: 1. 125 ms wide square wave pulse.

2.Maximum time = 2 minutes.

< 247 Hz), LRC

Freq

< 247 Hz), LRC

Freq

> 309 Hz), LRC

Freq

Loss(th)

= 25°C, unless otherwise noted).

A

Reg

C

bat

Pwr

Q1
Q2

O

ref

ref

Th
Rot
UV
OV

LD

f – 68 – Hz

osc

DC

DC
Freq

S

F

H

– 14.85 – V

–13 –11 – 9.0 mV/°C

11.5 14.85 16.5 V

0.5 1.2 2.0 V

– 1.3 2.0 mA
– – 3.0 mA

1.1 1.25 1.4 V

1.7 2.0 2.3 V

– 0.6 1.0 V

1.0 1.25 1.5 V
– 36 – Hz

1.0 1.25 1.5 V

1.09(V

1.33(V

) 1.12(V

ref

) 1.4(V

ref

205 280 350 kHz

27 29 31 %

3.5 4.7 5.5 %

247 273 309 Hz

8.5 9.5 10.5 %/sec

34 38 42 %/sec

409 455 501 %/sec

) 1.16(V

ref

) 1.48(V

ref

) V

ref

) V

ref

2

MOTOROLA ANALOG IC DEVICE DATA

MC33092A

Sense

Phase

B+ Supply

3

CC

V

1.0 k

1

CC

V

250

O

ref

V

MTB36N06E

(Q1)

13

14

Power

Bandgap

Reference

8

17

Charge

Supply

Bias

Field

2.0 k

20 k

18

Gate

Pump

Undervoltage

Source

Ignition

Lamp

2.0 k

3

Power

Up/Down

Lamp

Collector

Circuit

500

BSP52T1

(Q2)

Output

Control

4

Lamp

Control

Lamp

Base

Logic

8

Stator

5

Up/Down

10

Ground

)

4

(2

Counter

Battery

MR850

Ground 6 and 1511

Ground

Rate

Configuration

Alternate Stator

Figure 1. Simplified Application

28 k

R3

86 k

ref

V

UV
FB

45 k

20

19
1

28 k

MC33092

Lost

Sense

Circuit

Load Dump

Buff

Low

Pass

Filter

Signal

Combiner

and Switch

2

Sense

(Remote)

Overvoltage

Regulate

X1

12

Reg

(Local)

Supply

10

Logic

Control

12

Counter

Phase

4

DAC

R1

(1/12/48)

Divide By

)

8

(2

Counter

)

4

(2

Prescaler

Oscillator

7

12.5 k

2.5 sec

Oscillator 9

280kHz

R2

Osc.

10 sec

Adjust

RT

R3 = 10 k to 15 k

RT = 50 k to 100 k

NOTES: R1 = R2 = 3.0 k to 5.0 k

Figure 1.

MOTOROLA ANALOG IC DEVICE DATA

3

MC33092A

Figure 2. Standby Current versus T emperature Figure 3. T urn–On Voltage versus Temperature

0.8

0.7

0.6

0.5

0.4

, STANDBY CURRENT (mA)

SB

0.3

I

0.2
– 55 – 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

ISB = Current from VCC Supply
VCC = 12.8 V (see Figure 8)
VC1 = 0.5 V (Ignition OFF)
V

= V

= V

Pin 12

Pin 11

= 1.5 V

= V

Pin 19

Pin 2

V

Pin 10

Figure 4. Reference V oltage versus Temperature

2.2

V

= Voltage at Pin 20

ref

VCC = 12.8 V (see Figure 8)

2.1

VC1 = 0.5 V (Ignition OFF)
V

Pin 2

V

Pin 10

= V

= V

Pin 12

Pin 11

= 1.5 V

= V

Pin 19

= 0 V

= 0 V

1.8

1.7

1.6

1.5

1.4

1.3

, TURN-ON VOLTAGE (V)

1.2

On

1.1

1.0
– 55 – 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

VON = Voltage at Pin 3
VCC = 12.8 V (see Figure 8)
V

= V

Pin 2

Pin 10

= V

Pin 12

Pin 11

V

Figure 5. 0TC Reference V oltage

versus T emperature

1.26
V

O

= Voltage at Pin 8

ref

VCC = 12.8 V (see Figure 8)

1.25
VC2 = 6.0 V (S1 Closed)

V

1.24

Pin 2

V

Pin 10

= V

= V

Pin 12

Pin 11

= 1.5 V

= V

Pin 19

= 0 V

= 1.5 V

= V

Pin 19

= 0 V

2.0

1.9

, REFERENCE VOLTAGE (V)

ref

V

1.8
– 55 – 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

Figure 6. Oscillator Frequency

versus Timing Resistor

110

100

Ω

90

80

, RESISTANCE (k )

T

VCC = 14.8 V (see Figure 8)

R

VC2 = 6.0 V (S1 Closed)

70

V

= V

Pin 2

Pin 10

= 0 V

Pin 11

220 240 260 280 300 320 340 360 10 20 30 40 50 60 70 80 90 100

60

V

200

R = Resistance from Pin 7 to Ground
f = Frequency at Pin 9

= V

Pin 12 = VPin 19

f, FREQUENCY (kHz)

= 1.5 V

1.23

1.22

O

1.21

ref

V , 0TC REFERENCE VOLTAGE (V)V

1.20
– 55 – 25 0 25 50 75 100 125

°

TA, AMBIENT TEMPERATURE (

C)

Figure 7. Input V oltage versus Output Duty Cycle

3.0
Vin = Voltage at Pin 2 or 12

Duty Cycle taken at Pin 17
VCC = 14.8 V (see Figure 8)
VC2 = 6.0 V (S1 Closed)
V

= 1.5 V @ > 309 Hz

Pin 10

V

Pin 11

= 0 V; V

Pin 19

= 1.5 V

, INPUT VOLTAGE (V) V

Input

2.5

2.0

1.96

1.95

1.94

1.93

Load Dump
Protection

0

DC, DUTY CYCLE (%)

4

MOTOROLA ANALOG IC DEVICE DATA