Sanyo STK6877 Specifications

Ordering number : EN4874

N2894TH (OT) No. 4874-1/8

Overview

The STK6877 is an H bridge power pack reversible brushtype DC motor driver that uses Sanyo’s unique insulated metal substrate technology (IMST) substrate. This technology provides superlative thermal dissipation characteristics. By adopting MOSFET devices as its power elements, this hybrid IC realizes reduced loss and increased current outputs as compared to our earlier STK6860H series.

Applications

• Plain paper copier drum and scanner motors

• LBP drum motors

• Printer head carriage motors

• All types of DC motor application equipment

Features

• Increased margins with respect to rush currents due to the adoption of MOSFET elements

• TTL level compatible inputs

• Support for both two pin control saturation operation and three pin control PWM control

• A braking function is provided.

• Wide operating power supply voltage range (VCC1 = 12 to 42 V)

• Few required external components (Operation is possible with only two external bootstrap capacitors.)

Package Dimensions

unit: mm

4148

[STK6877]

STK6877

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Reversible Brush-Type DC Motor Driver

(output current: 8 A)

Thick Film Hybrid IC

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

1 max No signal 50 V

Maximum supply voltage 2 V

2 max No signal 7 V

Maximum motor rush current I

peak

Period = 100 ms, duty ≤ 1%

18 A

2 = 5.0 V Operating substrate temperature Tc max 105 °C Junction temperature Tj max 150 °C Storage temperature range Tstg –40 to +125 °C

Operating Characteristics at Ta = 25°C, VCC1 = 24 V, VCC2 = 5.0 V

Note: Constant voltage power supplies must be used.

Equivalent Circuit

Note: 1. Boot is an abbreviation for bootstrap.

2. The OSC pin (pin 11) must be left open in operation.

No. 4874-2/8

STK6877

Ratings

Parameter Symbol Conditions

min typ max

Unit

Quiescent current I

CCO

RL= 2.8 Ω 30 40 50 mA

Output saturation voltage Vst R

= 2.8 Ω 0.90 1.20 V

Input on voltage V

2.0 V

Input off voltage V

0 0.8 V

Input on current 1 I

1 VI= 2.7 V, pin 14 20 µA

Input on current 2 I

2 VI= 2.7 V, pin 13 or pin 15 0.7 mA

Input off current 1 I

1 VI= 0.4 V, pin 14 –0.4 mA

Input off current 2 I

2 VI= 0.4 V, pin 13 or pin 15 –0.2 mA

Diode forward voltage Vdf Idf = 8 A, V

= 0 1.6 2.0 V

Sensing voltage Vsens 0.5 V

Specifications

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Supply voltage 1 V

1 Input active 12 to 42 V

Supply voltage 2 V

2 Input active 5 ±5% V

Motor output current I

max DC 8 A PWM frequency fp 1 to 30 kHz FET withstand voltage V

DSS

60 V

Sample Application Circuit

A B Forward H L Reverse L H Standby 1(illegal) H H Standby 2 L L

Thermal Design

1. Heat Sink Thermal Resistance (θc-a) Derivation

The size of the heat sink required for the hybrid IC is determined by the motor output current (IOH), the electrical characteristics of the motor and the chopping frequency, and the frequency of current application. The thermal resistance (θc-a) of the heat sink is derived from the following formula.

θc-a =

Tc max – Ta

(°C/W)

Tc max: Hybrid IC case temperature (°C) Ta: Ambient temperature within the set (°C) Pd: Average internal power dissipation within the hybrid IC (W)

As an example, Figure 2 can be used to derive the required area for a 2 mm aluminum plate heat sink. Since the ambient temperature within a set varies greatly with the set internal air circulation conditions, the size of the heat sink must be determined taking into account the constraint that the temperature of the back surface of the IC (the aluminum plate side) must never under any conditions exceed 105°C.

No. 4874-3/8

STK6877

H: 5 V L: 0 V Note: 1. Input pin specifications

• TTL levels handled

• Maximum PWM input frequency: 30 kHz

• When used in two pin control mode, the PWM pin must be tied high.

2. Since the OSC pin (pin 11) is a monitor pin, it should be left open in normal operation.

Figure 1 θc-a vs. Pd Figure 2 θc-a vs. S

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