Cherry Semiconductor CS8312YN8, CS8312YDR8, CS8312YD8 Datasheet

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