Datasheet CS8312YN8, CS8312YDR8, CS8312YD8 Datasheet (Cherry Semiconductor)

1

Features

■ µP Compatible Inputs

■ Adjustable Current Limit

Thresholds

■ External Sense Resistor

■ Flag Signal to Indicate

Output Status

Package Options

8L PDIP & SO Narrow

CS8312

IGBT Ignition Predriver

with Dynamic Current Regulation

Description

Block Diagram

Absolute Maximum Ratings

The CS8312 is a bipolar micropro­cessor interface IC designed to
drive an IGBT (or logic level
MOSFETs) powering large induc­tive loads in harsh operating envi­ronments. The ICÕs dynamic cur­rent limit function lets the micro­processor adjust the current limit
threshold to the real time needs of
the system.

CLI, the current limit input, sets the
current limit for the IGBT high or
low as directed by the system
microprocessor. CLI also raises and
lowers the threshold on the diag­nostic FLAG output signal. The
FLAG output signals the micropro­cessor when the current level
approaches current limit on the
IGBT. The CTRL input enables the
FLAG function.

CS8312

Supply Voltage.................................................................................-0.3V to +12V

Digital Input Currents....................................................................................2mA

Internal Power Dissipation (TA= 25¡C) .................................................700mW

Junction Temperature Range.....................................................-40¡C to +150¡C

Storage Temperature Range ......................................................-55¡C to +165¡C

Lead Temperature Soldering

Wave Solder(through hole styles only).............10 sec. max, 260¡C peak

Reflow (SMD styles only).............60 sec. max above 183¡C, 230¡C peak

Electrostatic Discharge (Human Body Model) ............................................2kV

A Company

¨

Rev. 4/7/97

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

CTRL

FLAG

V

Control

Logic

V

T

CC

Gate

Driver

SENSEÐCLIGnd

1

FLAG

SENSE+

OUT

SENSE+

V

REF

SENSEÐ

Gnd

V

CC

CTRL

CLI

OUT

V

T

Latch

2

Electrical Characteristics 7V ² VCC² 10V; -40¡C ² TA² +125¡C; unless otherwise specified

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS8312

■ General

Power Supply 7 10 V

including Ripple Voltage
Supply Ripple Frequency 10 60 kHz
Differential Ground Voltage DC SENSE- to Gnd -0.1 1.0 V

AC SENSE- to Gnd -0.2 0.6 V
Differential Ground Frequency 10 60 kHz
Quiescent Current, I

Q

Turn On V

CTRL

=5.5V 15 mA

Turn Off V

CTRL

=-0.3V 5 mA

Supply Voltage Rejection V

CTRL

=5.5V 30 dB

Differential Ground V

CTRL

=5.5V 30 dB

Rejection Ratio

Differential Ground Current V

CTRL

= -0.3V 3 mA

Ratio (V

SENSE--VGnd

)DC=1V

(V

SENSE--VGnd

)AC=0.6V

Unity Gain Bandwidth V

CTRL

=5.5V 400 kHz

Clamp Voltage V

CTRL

=5.5V; I

OUT

=1mA 5.5 V

Output Off Voltage V

CTRL

=-0.3V; I

OUT

=10µA 0.5 V

V

CTRL

=-0.3V; I

OUT

=200µA 1.2 V
Turn On Delay CTRL increasing 30 us
Turn Off Delay CTRL decreasing 30 us

■ Control Function

Input Voltage Range I

CTRL

=2mA -0.3 5.5 V

Input Threshold

Turn On CTRL increasing 3.5 V
Turn Off CTRL decreasing 1.5 V
Hysteresis 0.4 2.0 V

Voltage I

CTRL

=10µA MAX 1.1 V

Input Capacitance 50 pF

■ Current Limit Increase Function

Input Voltage Range I

CTRL

=2mA -0.3 5.5 V

Input Threshold

Turn On CLI increasing 3.5 V
Turn Off CLI decreasing 1.5 V
Hysteresis 0.4 2.0 V

Voltage I

CLI

=10µA max 1.1 V

Input Capacitance 50 pF

■ Output Stage

I

OUT

5mA

■ Flag Function

Output Low V

CTRL

=5.5V; I

FLAG

=1.5mA 0.9 V
Leakage Current V

CTRL

=-0.3V 10 µA
Output Capacitance 50 pF
Turn On (V

SENSE+

Ð V

SENSE-

)V

CTRL

=5.5V; V

CLI

=-0.3V 210 225 240 mV

V

CTRL

=5.5V; V

CLI

=5.5V 300 350 mV

3

Electrical Characteristics continued

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS8312

Package Pin Description

PACKAGE PIN # PIN SYMBOL FUNCTION

8L PDIP & SO

1 FLAG Indicates whether current through the IGBT has reached a pre-

set level.

2 SENSE+ Positive input to current comparator.

3 SENSEÐ Ground (SENSE-) for current sense resistor.

4 Gnd Ground connection.

5 OUT Output voltage to IGBT (MOSFET) gate.

6 CLI Current limit input increase.

7 CTRL Control input.

8V

CC

Supply voltage.

The flag indicates when the voltage across the two sense
pins is approaching a current limit level that has been
determined by the value of the external sense resistor
(R

SENSE

) and the state of the CTRL and CLI pins. If the

voltage across the sense pins (SENSE+, SENSE-) is less
than the flag turn-on voltage, then the FLAG is off. When
the voltage between the sense pins equals the FLAG turn
on voltage, the FLAG will latch on until the CTRL pin
goes low. FLAG is disabled whenever CTRL is low.
Changing the CLI pin from low to high will increase
nominal FLAG turn on voltage by approximately 45%.

Table 1 FLAG Timing Sequence

The CS8312 output (OUT) saturates and supplies voltage
to the IGBT (or MOSFET) gate once the CTRL switches
from low to high. As current through the IGBT (MOSFET)
increases and the voltage across the sense resistor passes
the flag turn on voltage, the FLAG will turn on. If the cur­rent through the sense resistor continues to rise and the
sense resistor voltage reaches the regulation sense volt­age, then the gate voltage will fall to a level that regulates
the driver and maintains the regulation sense voltage at
the sense resistor.

Changing the CLI pin from a logic low to a logic high
increases the FLAG turn on voltage by approximately
45% and the regulation sense voltage by approximately
39% respectively.

Current Limit Function

Output Stage

State CONTROL SENSE+ FLAG

0 Low X OFF
1 High Below Threshold OFF
2 High Above Threshold ON
3 High X ON
0 Low X OFF

Flag Function (see Application Diagram)

Circuit Description

■ Flag Function: continued

Turn Off Delay CTRL decreasing 10 us
Turn On Delay 10 us
Disable Time 100 450 us

■ Sense Function

Input Voltage Range -0.3 2.5 V
Sense Regulation Voltage V

CTRL

=5.5V; V

CLI

=-0.3V 270 295 320 mV

V

CTRL

=5.5V; V

CLI

=5.5V 380 410 440 mV

Input Leakage Current V

CTRL

=5.5V 5 µA
Propagation Delay V

CTRL

=5.5V 20 us

4

Application and Test Diagram

CS8312

Microprocessor

V

CC

V

BA

T

LOAD

0.1mF

V

CC

V

CC

OUT

R

CS8312

FLAG

CTRL

CLI

SENSE+

R

SENSE

SENSEÐ

Gnd

Part Number Description

CS8312YN8 8L PDIP
CS8312YD8 8L SO Narrow
CS8312YDR8 8L SO Narrow (tape & reel)

5

CS8312

Thermal Data 8L SO 8L PDIP

R

QJC

typ 45 52 ûC/W

R

QJA

typ 165 100 ûC/W

Package Specification

PACKAGE DIMENSIONS IN mm (INCHES)

Ordering Information

PACKAGE THERMAL DATA

Rev. 4/7/97

D

Lead Count Metric English

Max Min Max Min
8 Lead SO Narrow 5.00 4.80 .197 .189
8 Lead PDIP 10.16 9.02 .400 .355

© 1999 Cherry Semiconductor Corporation

Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.

Surface Mount Narrow Body (D); 150 mil wide

Plastic DIP (N); 300 mil wide

0.39 (.015)
MIN.

2.54 (.100) BSC

1.77 (.070)

1.14 (.045)

D

Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.

.203 (.008)

.356 (.014)

REF: JEDEC MS-001

3.68 (.145)

2.92 (.115)

8.26 (.325)

7.62 (.300)

7.11 (.280)

6.10 (.240)

.356 (.014)

.558 (.022)

1.27 (.050) BSC

0.51 (.020)

0.33 (.013)

6.20 (.244)

5.80 (.228)

4.00 (.157)

3.80 (.150)

1.57 (.062)

1.37 (.054)

D

0.25 (0.10)

0.10 (.004)

1.75 (.069) MAX

1.27 (.050)

0.40 (.016)

REF: JEDEC MS-012

0.25 (.010)

0.19 (.008)