FAN8025G3 FAIRCHILD | Alldatasheet
Document overview
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- PDF pages: 13
Technical content
Features
- 2-Channel BTL drivers with current feedback 2-Channel BTL DC motor drivers 1-Channel Logic input loading driver Built-in thermal shutdown circuit Built-in mute circuit Operating supply voltage: 4.5~13.2V
Description
The FAN8025G3 is a monolithic IC, suitable for 2-ch BTL DC motor drivers, 2-ch motor drivers with current feedback which drive the focus and the tracking actuator and 1-ch logic input loading driver. 28-SSOPH-375SG2 Typical Applications Compact disk ROM (CD-ROM) Digital video disk player (DVDP) Video compact disk player(VCDP) Other compact disk media
Ordering Information
X:Tape & Reel type Device Package Operating Temp. FAN8025G3 28-SSOPH- 375SG2 -35 °C ~ 85 °C FAN8025G3X 28-SSOPH- 375SG2 -35 °C ~ 85 °C FAN8025G3 5-Cha nnel Motor Driv er
28 27 26 25 24 23 22 21 20 19 18 17 16 15 12 3 45 6 7 89 10 11 12 13 14 VCC2 MUTE REF IN2 IN3 VCC1 DO3 − DO3+ DO2 − DO2+ IN5 CAP5.1 CAP5.2 FB5 FB4 CAP4.1 CAP4.2 SGND CTL REV DO1 + FAN8025G3 (GND) FIN FIN (GND) IN4 FWD DO1 − DO5 − DO5+ DO4 − DO4+
Pin Number Pin Name I/O Pin Function Description
1 IN5 A CH5 input
2 CAP5.1 A Connection with capacitor 3 CAP5.2 A for CH5
4 FB5 A Feedback for CH5
5 FB4 A Feedback for CH4
6 CAP4.1 A Connection with capacitor 7 CAP4.2 A for CH4
8 SGND P Signal ground
9 IN4 A CH4 input
10 CTL A CH1 speed control input
11 FWD I CH1 forward input
12 REV I CH1 reverse input
13 DO1+ O Drive1 Output ( +)
14 DO1 − O Drive1 Output ( −)
15 DO2 − O Drive2 Output ( −)
16 DO2 + O Drive2 Output ( +)
17 DO3 − O Drive3 Output ( −)
18 DO3+ O Drive3 Output ( +)
19 VCC1 P Power for channel 1,2 and 3
20 IN3 A CH3 input
21 IN2 A CH2 input
22 REF A Bias voltage input
23 MUTE I CH2,3,4 and 5 mute signal input
24 VCC2 P Power for channel 4and 5
25 DO4+ O Drive4 Output (+)
26 DO4 − O Drive4 Output ( −)
27 DO5+ O Drive5 Output ( +)
28 DO5 − O Drive5 Output ( −)
CAP5.1 1IN5 Level shift DO5- FB5
18 DO3+
17 DO3-
16 DO2+
15 DO2-
13 DO1+
14 DO2-
CAP5.2 CAP4.1 CAP4.2
24 VCC2
19 VCC1
7.5k 7.5k 20k10k 7.5k 7.5k 20k10k 20k10k 11FWD 10CTL Logic Speed control VCC1 VCC1 TSD
CH2/3/4/5 Inputs Current Feedback Amp Outputs Current Feedback Amp Compensation Inputs Current Feedback Inputs 10K 1K 1KVCC1 VCC1 Ref 10K 10K VCC1 VCC1 7.5K 7.5K VCC1 VCC1 10K 20K 10K 20K VCC1 VCC1 Drive output -
Equivalent Circuits(continued) CH1 Inputs(FWD/REV) CH1 Control Input(CTL) Mute Input Ref Input CH1/2/3 Drive Outputs CH4/5 Drive Outputs 30K 30K VCC1 10K 40K 35K VCC1 VCC1 40K 40K 100K VCC1 1K 1K 1K 1K 1K VCC1 30K 20K VCC1 30K 20K VCC1 VCC2
Absolute Maximum Ratings (Ta = 25°C) NOTE: 1. When mounted on a 50mm × 50mm × 1mm PCB (Phenolic resin material). 2. This is experimental data. 3. Power dissipation decrease rate : -20mW/°C(Ta≥25°C). 4. Should not exceed P D and SOA (Safe Operating Area). Power Dissipation Curve Recommended Operating Conditions (Ta = 25°C) Parameter Symbol Value Unit Maximum supply voltage V CC1,2max 15 V Power dissipation P D 2.5note W Operating temperature range T OPR -35 ~ +85 °C Storage temperature range T STG -55 ~ +150 °C Parameter Symbol Min. Typ. Max. Unit Supply Voltage V CC1,2 4.5 - 13.2 V 175150125100755025 1,000 2,000 3,000 Pd [mW] Ambient Temperature, Ta [°C]0 SOA
Electrical Characteristics
(Unless otherwise specified, Ta = 25 °C, VCC1 = 12V, VCC2 = 5V & the other conditions & nomenclatures follow the test circuit) * : Guaranteed design values Parameter Symbol Conditions Min. Typ. Max. Unit Quiescent Current1 I CC1 Stand-by off - 18 27 mA Quiescent Current1 I CC2 Stand-by on - 9 - mA Mute On Voltage V MON -- - 0 . 5 V Mute Off Voltage V MOFF -2 . 0 - - V REF input voltage range V REFIN - 1.0 - 3.3 V REF input current range* I REFIN VREF =1.65V -10 - 10 uA ACTUATOR DRIVER(CH4,CH5) Output Offset Current45 I OO45 -- 6 0 + 6 m A Maximum Output Voltage45 V OM45 -3 . 6 4 . 0 - V Transconductance G M45 VIN = 100mVp-p, f=1kHz 1.2 1.4 1.6 A/V Control voltage input range45* VIN45 -0 - 5 V SLED/SPINDLE DRIVER(CH2,CH3) Output Offset Voltage23 V OF23 -- 1 0 0 0 + 1 0 0 m V Maximum Output Voltage23 V OM23 - 9.5 10.0 - V Closed loop Voltage Gain23 G VLO23 VIN = 100mVp-p, f=1kHz 16 18.0 20 dB Control voltage input range23* VIN23 -0 - 5 V LOADING DRIVER(CH1) Input high level Voltage V IH -2 - - V Input low level Voltage V IL -- - 0 . 5 V Output Offset Voltage1 V OF1 -- 5 0 0 5 0 m V Transfer Gain G V - 1.0 1.2 1.4 V/V
Application Information
- Reference Input Reference input (PIN 22) The applied voltage at the reference input pin must be ranged between 1.0V and 3.3V , when VCC1 =12V . When the reference input voltage goes below 0.7V , all channels are disabled. 2. Stand-by Function MUTE input (PIN 23) We recommend CH1 as the loading(or tray) motor driver. Detailed logic table is as below. 3. Protection Function Thermal shutdown (TSD) When the chip temperature rises above 175°C, the thermal shutdown (TSD) circuit is activated and the output circuit is in the mute state, that is off state. The TSD circuit has a temperature hysteresis of 25°C 4. Separation Of Power Supply VCC2 (PIN 24) VCC2 is the power supply for CH4 and CH5, which are current feedback drivers. VCC1 (PIN 19) VCC1 is the power supply for CH1, CH2, CH3 and predriver. VCC1 input voltage must be higher than or same to VCC2. (VCC1≥VCC2) INPUT LOGIC CH1 CH2 CH3 CH4 CH5 Stand-by input H i g h OOOOO Low or open O X X X X
- Current feedback channels(channel 4 & 5) The reference voltage(ref) is given externally through pin 22. The input OP-amp output signal is amplified by (20K/10K) times and then fed to the current feedback amplifier. The current feedback amplifier compares the output current sensed input and command input then makes the controlled output to eliminate delay effect of the load. Please refer to the application note for more information about current feedback theory(http://www.fairchildsemi.com/an/AN/AN-4109.pdf). The DC gain of current feedback amplifier and power amplifier is unity, that is 1 [A/V]. Users can change the gain by adding external resistor at the command input. 5. Channel 2 & 3 schematic The reference voltage(ref) is given externally through pin 22. The input OP-amp output signal is amplified by (12K/10K) times and then fed to the power amplifier. The gain of power amplifier is 4 so the total max gain of channel 2 and 3 is 8. Level shift 20k 10k 7.5k 7.5kref actuator Sensing resistor Rext Cext Command power ampcurrent amp Level shift 20k 10k ref power amp M Command
- Channel 1 schematic The inputs of channel 1 are FWD, REV which are logic inputs and CTL which is linear input. The CTL input is used to control the output gain, meanwhile FWD and REV are logic inputs to select output driver’s direction. Below table is FWD and REV logic input table. Input Output FWD REV DO1+ DO1- condition H H Vpref Vpref Brake H LHL F o r w a r d L HLH R e v e r s e L L Vpref Vpref Brake REV Level shift11FWD CTL Logic M Speed control DO1- DO1+ Vpref Vpref
Typical Application Circuits SPIN COMMAND SPINDLE MOTOR LOADING MOTOR 12V FAN8025G3 SERVO IC FOCUS TRACKING SPINDLE SLED FOCUS ACTUATOR IN1 CAP5.1 CAP5.2 FWD IN4 FB5 DO1 − DO1+ CAP4.1 CAP4.2 MUTE REF IN2 IN3 VCC1 DO3 − DO3+ DO5 − DO5+ SPIN COMMAND REF MOTOR TRACKING ACTUATOR R CS R CS MUTE SLED LOADING DO2 − DO2+ SLED COMMAND REV SGND DO4 − DO4+ FB4 PGND CTL VCC2 SLED COMMAND PGND
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