Datasheet LB1695M Datasheet (SANYO)

Page 1

Overview

The LB1695M is a 3-phase brushless motor driver IC that is optimal for driving the DC fan motors used in home appliances such as water heaters.

Package Dimensions

unit: mm

3216A-MFP30S

Monolithic Digital IC

12398HA(OT) No. 5802-1/6

SANYO: MFP30S

[LB1695M]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN

DC Fan Motor Driver

LB1695M

Ordering number : EN5802

Allowable power dissipation, Pd max - mW

Parameter Symbol Conditions Ratings Unit

Supply voltage V

10 V

45 V

Output current I

Allowable power dissipation Pd max

When mounted on a printed circuit board (114.3 × 76.1 × 1.6 mm, glass epoxy)

2W Operating temperature Topr –20 to +100 °C Storage temperature Tstg –55 to +150 °C

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Operating supply voltage range

4.5 to 5.5 V

5 to 42 V

Voltage slew rate at power on

∆V

/∆t At the point VCC= V

LVSD

(OFF)* Under 0.04 V/µs

∆V

/∆t At the point VM= 0 V* Under 0.16 V/µs

Note: For the items marked with asterisks (*), through currents may flow in the outputs if the power supply voltage slew rate is excessive.

Allowable Operating Ranges at Ta = 25°C

Glass epoxy board with a 56% wiring density (When mounted)

Ambient temperature, Ta - °C

Page 2

No. 5802-2/7

LB1695M

Parameter Symbol Conditions

Ratings

Unit

min typ max

Current drain I

Forward rotation 13 19 mA

Output saturation voltage

(sat)1 IO= 0.5 A VO(sink) + VO(source) 1.8 2.4 V

(sat)2 IO= 1.0 A VO(sink) + VO(source) 2.1 2.8 V

Output leakage current I

leak 100 µA

[Hall Amplifier]

Input bias current I

1 4 µA

Common-mode input voltage range V

ICM

1.5 3.2 V

Hysteresis ∆V

21 30 37 mV

Input voltage low → high V

SLH

5 15 25 mV

Input voltage high → low V

SHL

–25 –15 –5 mV

[FG Pin] (Speed pulse output)

Output low-level voltage V

FGLIFG

= 5 mA 0.4 V

Pull-up resistance R

7.5 10.0 12.5 kΩ

[Forward/Reverse Operation]

Forward V

1 0.0 0.8 V

Reverse V

2 4.2 5.0 V

[Current Limiter Operation]

Limiter V

0.42 0.50 0.60 V

[Thermal Protection Circuit]

Operating temperature TSD *1 150 180 °C Hysteresis ∆TSD *1 40 °C

[Low Voltage Protection Circuit]

Operating voltage V

LVSD

3.5 3.8 4.1 V

Release voltage V

LVSD(OFF)

4.3 4.5 V

Hysteresis ∆V

LVSD

0.4 0.5 0.6 V

[C Pin]

Charge current I

R = 33 kΩ 30 40 50 µA

Discharge current I

R = 33 kΩ 90 120 150 µA

Charge start voltage V

R = 33 kΩ 0.3 0.4 0.5 V

Charge start voltage V

R = 33 kΩ 1.5 2.0 2.5 V

Output current ignored time t

R = 33 kΩ, C = 4700 pF 58 68 78 µs

Output off time t

R = 33 kΩ, C = 4700 pF 164 193 222 µs

Note: Items marked with an asterisk are design target values and are not tested.

F/R FG output

Forward (low): 0.0 to 0.8 V Reverse (high): 4.2 to 5.0 V

Electrical Characteristics at Ta = 25°C, VCC= 5 V, VM= 30 V

Truth Table

Input Forward/reverse control Output FG output

IN1 IN2 IN3 F/R Source → sink FG1 FG2

1 H L H

L OUT2 → OUT1

L L

H OUT1 → OUT2

2 H L L

L OUT3 → OUT1

L H

H OUT1 → OUT3

3 H H L

L OUT3 → OUT2

L L

H OUT2 → OUT3

4 L H L

L OUT1 → OUT2

H H

H OUT2 → OUT1

5 L H H

L OUT1 → OUT3

H L

H OUT3 → OUT1

6 L L H

L OUT2 → OUT3

H H

H OUT3 → OUT2

Page 3

Pin No. Symbol Pin voltage (V) Equivalent circuit Pin function

Pin Assignment

No. 5802-3/7

LB1695M

Pin Functions

1, 2, 14, 15, 16, 17,

29, 30

FRAME

• Pins provided for heat dissipation. These pins must be electrically open.

• Power supply for blocks other than the output block.

FG1

FG2

• Speed pulse output 1 A pull-up resistor is built in.

• Speed pulse output 2 A pull-up resistor is built in.

6 7

8 9

10 11

IN1

–

IN1

IN2

–

IN2

IN3

–

IN3

1.5 V min

– 1.8 V max

• Hall inputs. The logic high state is when IN

> IN–.

12 F/R

0.0 V min V

max

• Forward reverse control

13 GND

• Ground for blocks other than the output block. The RF pin voltage will be the lowest potential

taken on be the output transistors.

Continued on next page.

Page 4

No. 5802-4/7

LB1695M

Continued from preceding page.

Pin No. Symbol Pin voltage (V) Equivalent circuit Pin function

22 23 24

OUT3 OUT2 OUT1

• Power supply pin that provides the IC output.

• Output current detection. Connect the resistor Rf between this pin and ground. The output current is limited to the value set by the ratio VRF/Rf (current limiter operation).

• Output 3

• Output 2

• Output 1

• Sets the output off time during current limiter operation and the output current ignored time.

• Sets the C pin charge/discharge current.

Block Diagram and Peripheral Circuit Diagram

Page 5

LB1695M Functional Description

1. Hall input circuit The Hall input circuit is a differential amplifier with a hysteresis of 30 mV (typical). The operating DC level must fall within the common-mode input voltage range (1.5 V to VCC- 1.8 V). We recommend providing inputs with a swing of at least three times the hysteresis, i.e. 120 to 160 mV p-p, to prevent noise from interfering with circuit operation. Insert capacitors in the Hall amplifier IN+and IN–inputs if capacity is found to be problematic during noise evaluation.

2. Protection circuits

• Low voltage protection circuit

If the VCCvoltage falls below a stipulated level (VLVSD), the sink side output transistor is turned off. This circuit prevents incorrect operation at low VCCvoltages.

• Thermal protection circuit

If the junction temperature exceeds a stipulated temperature (TSD), the sink side output transistor is turned off. This circuit protects the IC from thermal damage. Applications must be designed so that this circuit only operates in abnormal conditions.

3. FG output circuit

This circuit outputs signals that are synthesized from the IN1, IN2, and IN3 Hall amplifier input signals and to which

wave shaping has been applied. FG1 has the same frequency as the Hall inputs, and FG2 has a frequency three times that of the Hall inputs.

4. Forward/reverse control circuit This IC is designed assuming that applications will not perform motor forward/reverse (F/R) control operations while the motor is turning. Through currents will flow in the output if the motor direction is switched while the motor is turning and ASO will become a problem. We recommend performing F/R control operations with the VM power supply in the off state, i.e. when the motor is stopped.

5. VCCand VMpower supplies If the power supply slew rate at power on is excessive, through currents will flow in the output and ASO will become a problem. The power supply slew rates must not exceed ∆VCC/∆t = 0.04 V/µs and ∆VM/∆t = 0.16 V/µs. Also, at power on it is desirable to bring up the VCCvoltage first, and then bring up the VMvoltage. At power off, it is desirable to bring down VMfirst, and then bring down VCConly after the motor has stopped. If VCCis turned off after VMbut while the motor is still turning due to inertia, the VMvoltage may rise beyond the voltage handling capacity of the IC.

6. Power supply stabilization capacitors If large fluctuation occur in the VCCline, the low-voltage protection circuit may operate incorrectly. Capacitors (with values of a few µF) must be inserted in the VCCline (between VCCand ground) to stabilize the power supply. Since large switching current flow in the VMline, fluctuations in the IC VMvoltage may occur due to inductances in the wiring pattern. Capacitors must be inserted in the VMline (between VMand ground) so that incorrect operation and voltages in excess of the IC voltage handling capacity do not occur. In particular, if the application wiring lines (VM, VCC, and ground) are long, capacitors adequate to stabilize the power supply lines must be used.

7. Current limiter circuit When the output current reaches the current set as the output current (the limit value), the current limiter circuit turns off the sink side output transistor to limit the output current to the limit value. The RF pin is used to detect the output current. In particular, the output current is detected as a voltage using the Rf resistor, which is inserted between the RF pin and ground. The current limiter operates when the Rf pin reaches 0.5 V (typical) and thus the output current is limited to a value of 0.5/Rf.

• Output off time

After the current limiter circuit operates and limits the current by turning off the sink side output transistor, it provides a fixed off period (referred to as the output off time), after which it turns the transistor back on. As opposed to current limiter techniques that operated the output in an unsaturated state, the use of an output switching system of this type for the current limiter has the advantage that ASO during current limiter operation is less likely to be a problem. The output off time is determined by the charging time of the capacitor connected to the C pin. When the current limiter operates, the circuit starts to charge the C pin capacitor, and the output off time is the time required to charge the capacitor to a voltage of 2 V (typical). When the capacitor voltage reaches 2 V, the sink side output is turned on again. The capacitor charge current is a fixed current determined by the resistor R connected to the R pin. The C charge

No. 5802-5/7

LB1695M

Page 6

current ICLand the output off time t

OFF

are related as follows: ICL≈ 1.3/R (R must have a value in the range 13 kΩ to 100 kΩ) t

Off

≈ C/ICL× 2.0 ≈ 1.53 × R × C

• Output current ignored time A regenerative current flows in the external diode provided to absorb regenerative currents in the upper side of the output that was turned off while the sink side of that output is turned off by the operation of the current limiter. When the output off time has elapsed and the sink side output has been turned on again a reverse current flows instantaneously in this diode, due to the reverse recovery period of the diode. This results in a current that may reach the current limit value instantaneously. If this current were to cause the current limiter circuit to operate again, the average current produced by the IC would be reduced, and the torque produced during motor drive could be reduced. Therefore, to assure that this current is not detected, the current limiter circuit provides a period (referred to as the output current ignored time) during which the output current is not detected for a fixed period after the sink side output is turned on again after being turned off. The output current ignored time is determined by the discharge time of the capacitor C connected to the C pin. Discharge starts at the point the capacitor has been charged to 2 V after the current limiter circuit operates, and the output current ignored time is the time until the capacitor is discharged to 0.4 V (typical). The capacitor discharge current is a fixed current set to be about three times the charge current ICL. Accordingly, the output current ignored time is about 1/3 the output off time. The C discharge current ICHand the output current ignored time tsm are related as follows:

ICH≈ 1.3/R × 3 tsm≈ C/ICH× 1.6

≈ 0.41 × R × C

Since the current limiter circuit provides a slope in the on time at the point when the sink side output is turned back on, reverse currents will not increase significantly, even if a rectifying diode (that is, a diode whose reverse recovery time is relatively long) is used as the regenerative current absorbing diode.

• Output off time setting Applications must set up the output off time to be optimal for the type of motor used. (This time is set by the external resistor connected to the R pin and the external capacitor connected to the C pin.) Figure 1 shows the waveforms during current limiter operation.

— If the output off time is too short:

Since the ratio between the output off time and the output current ignored time is fixed at about 3:1 by IC internal circuits, it is not possible to set these parameters independently. This means that if a relatively short output off time is used, the output current ignored time may be insufficient. If the output current ignored time is insufficient, the current limiter circuit may operate due to the reverse current in the regenerative current absorption diode. (See section 7 above.) Also, if the output off time is too short, the reverse current may increase leading to ASO problems.

— If the output off time is too long:

Setting up a relatively long output off time can reduce the average current produced by the IC, which can result in reduced motor torque. For certain motor types, this may make it impossible to switch from the current limiter operating state to steady state operation at motor startup.

No. 5802-6/7

LB1695M

Page 7

PS No. 5802-7/7

LB1695M

Figure 1 Current Limiter Circuit Operating Waveforms

8. IC internal power dissipation calculation

Pd = (VCC× ICC) + (VM× IM) – (the power dissipated in the motor coils)

9. Techniques for measuring IC temperature increases

Since it is not possible to measure the IC chip temperature directly, use one of the following techniques.

• Thermocouple measurement When measuring the IC temperature using a thermocouple, attach the thermocouple to the heat sink. While this technique is simple, it suffers from large measurement errors when the thermal generation within the IC is not stable.

• Measurement using IC internal diode characteristics We recommend using the parasitic diode between FG1 and ground to measure the operating temperature of this IC. To measure the temperature, set FG1 to the high (off) state, measure the VF voltage of the parasitic diode, and calculate the temperature from the temperature characteristics of the VFvoltage. According to Sanyo data: IF = –1 mA, and the VFtemperature characteristics are about –2 mV/°C.

This catalog provides information as of January, 1998. Specifications and information herein are subject to change without notice.

■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss.

■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use:

➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.

RF pin voltage

C pin voltage