Instrukcja obsługi Microchip MIC502

Microchip nieskategoryzowany MIC502

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MIC502

Fan Management IC

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com

October

6 , 2014

Revision 3.0

General Description

The MIC502 is a thermal and fan management IC that

supports the features for NLX/ATX power supplies and

other control applications.

Fan speed is determined by an external temperature

sensor, typically a thermistor resistor divider, and -

(optionally) a second signal, such as the NLX “FanC”

signal. The MIC502 produces a low frequency pulse- -width

modulated output for driving an external motor drive

transistor. Low uency PWM speed control allows -freq

operation of standard brushless DC fans at low duty-cycle

for reduced acoustic noise and permits the use of a very

small power transistor. The PWM time base is determined

by an external capacitor.

An open collector overtemperature fault output is asserted -

if the primary control input is driven above the normal

control range.

The MIC502 features a low power sleep mode with a user- -

determined threshold. Sleep mode completely turns off the

fan and occurs when the system is asleep or off (both

control inputs very low). A complete shutdown or reset can

also be initiated by external circuitry as desired.

The MIC502 is available as 8-pin plastic DIP and SOIC

packages in the 40°C to +85°C industrial temperature –

range.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• - Temperature proportional fan speed control

• - Low cost, efficient PWM fan drive

• 4.5V to 13.2V IC supply range

• Controls any voltage fan

• Overtemperature detection with fault output

• Integrated fan startup timer

• - Automatic user specified sleep mode

• - Supports low cost NTC/PTC thermistors

• 8- pin DIP and SOIC packages

Applications

• NLX and ATX power supplies

• Personal computers

• File servers

• Telecom and networking hardware

• Printers, copiers, and office equipment

• Instrumentation

• Uninterruptible power supplies

• Power amplifiers

Typical Application

Micrel, Inc.

MIC502

October

6 2 , 2014 Revision 3.0

Ordering Information

Part Number Temperature Range Package Lead Finish

MIC502YN –40° to +85°C 8- Pb-Free Pin Plastic DIP

MIC502YM –40° to +85°C 8- Pb-Free Pin SOIC

Pin Conguration

8- Pin SOIC (M)

8- Pin DIP (N)

(Top View)

Pin Description

Pin Number Pin Name Pin Function

1 VT1

Thermistor 1 (input): Analog input of approximately 30% to 70% of V

DD produces active duty cycle

of 0% to 100% at driver output (OUT). Connect to external thermistor network (or other

temperature sensor). Pull low for shutdown.

2 CF PWM timing capacitor (external component): Positive terminal for the PWM triangle-wave

generator timing capacitor. The recommended CF is 0.1µF for 30Hz PWM operation.

3 VSLP

Sleep threshold (input): The voltage on this pin is compared to VT1 and VT2. When V

T1 < VSLP

and VT2 < VSLP the MIC502 enters sleep mode until V

T1 Vor T2 rises above VWAKE. (VWAKE = VSLP +

VHYST). Grounding VSLP disables the sleep mode function.-

4 GND Ground

5 VT2

Thermistor 2 (input): Analog input of approximately 30% to 70% of V

DD produces active duty cycle

of 0% to 100% at driver output (OUT). Connect to motherboard fan control signal or second

temperature sensor.

6 /OTF Overtemperature fault (output): -Open collector output (active Indicates overtemperature - low).

fault condition (VT1 > VOT) when active.

7 OUT Driver output: Asymmetrical-drive active high complimentary PWM - output. Typically connect to

base of external NPN motor control transistor.

8 VDD Power supply (input): IC supply input; may be independent of fan power supply.

Micrel, Inc.

MIC502

October

6 3 , 2014 Revision 3.0

Absolute Maximum Ratings( )

Supply Voltage (VDD) .................................................... + V 14

Output Sink Current (IOUT(sink)). .................................... 10mA

Output Source Current (IOUT(source)) .............................. 25mA

Input Voltage (any pin) ......................... –0.3V to VDD + 0.3V

Junction Temperature (TJ) ....................................... +125°C

Lead Temperature (soldering, 5s) .............................. 260°C

Storage Temperature (Ts) ......................... – 65°C to +150°C

ESD Rating( )

3 ................................................. ESD Sensitive

Operating Ratings( )

Supply Voltage (VDD) .................................. +4.0V to +13.2V

Sleep Voltage (VSLP) .......................................... GND to V

Temperature Range (TA) ............................. – 40°C to +85°C

Power Dissipation at +25°C

SOIC .................................................................. 800mW

DIP..................................................................... 740mW

Derating Factors

SOIC .............................................................. 8.3mW/°C

Plastic DIP ..................................................... 7.7mW/°C

Electrical Characteristics( )

4.5V ≤ VDD ≤13.2V( )

5; TA = 25°C, bold –values indicate 40°C≤ TA ≤ +85°C, unless noted.

Symbol Parameter . . . Condition Min Typ Max Units

IDD Supply Current, Operating VSLP /= GND, OTF, OUT = open,

CF = 0.1µF, VT1

= VT2 = 0.7 VDD 1.5 mA

IDD(slp) Supply Current, Sleep VT1 = GND, VSLP

, /OTF, OUT = open,

CF = 0.1µF µA 500

Driver Output

tR Output Rise Time, Note 6 IOH µs = 10mA 50

tF Output Fall Time, Note 6 I

OL µs = 1mA 50

IOL Output Sink Current VOL = 0.5V 0.9 mA

IOH Output Source Current 4.5V ≤ VDD

≤5.5V, VOH = 2.4V 10 mA

10.8V ≤ VDD ≤13.2V, VOH = 3.2V 10 mA

IOS Sleep Mode Output Leakage VOUT 1 µA = 0V

Thermistor and Sleep Inputs

VPWM(max)

100% PWM Duty Cycle Input

Voltage 67 70 73 %VDD

VPWM(span)

VPWM(max) – VPWM(min) 37 40 43 %VDD

VHYST Sleep Comparator Hysteresis 8 11 14 %VDD

VIL

VT1 Shutdown Threshold

0.7

VIH

VT1 Startup Threshold 1.1 V

VOT

VT1 Overtemperature Fault

Threshold Note 7 74 77 80 %VDD

IVT , IVSLP VT1, VT2, VSLP Input Current -2.5 1 µA

tRESET Reset Setup Time Minimum time VT1 < VIL to guarantee reset.

Note 6 30 µs

Notes:

1. Exceeding the absolute maximum ratings may damage the device.

2. The device is not guaranteed to function outside its operating ratings.

3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5k in series with 100pF.Ω

4. Specification for packaged product only.

5. Part is functional over this V

DD Vrange. However, it is characterized for operation at 4.5V ≤DD V≤5.5V and 10.8V ≤DD ≤13.2V ranges. These ranges

correspond to a nominal VDD of 5V and 12V, respectively.

6. Guaranteed by design.

7. VOT is guaranteed by design to always be higher than V

PWM(max).

Specyfikacje produktu

Marka:	Microchip
Kategoria:	nieskategoryzowany
Model:	MIC502

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