DRV8871デバイスは、プリンタ、家電機器、産業用機器、その他小型機械用のブラシ付きDCモータ・ドライバです。2つのロジック入力がHブリッジ・ドライバを制御します。ドライバは4つのNチャネルMOSFETで構成され、最大ピーク電流3.6Aまでのモータを双方向制御します。入力をパルス幅変調(PWM)し電流減衰モードを選択してモータ回転数を制御できます。両方の入力を“L”にすると低消費電力スリープ・モードになります。
DRV8871デバイスには、高度な電流レギュレーション回路が搭載されており、アナログ基準電圧や、外付けのセンス抵抗を必要としません。この新たなソリューションは、標準の低コストで低消費電力の抵抗を使用して、電流スレッショルドを設定できます。電流を既知のレベルに制限できるため、システムに必要な電力を大幅に低減でき、特にモータの始動時やストール時に、安定した電圧を維持するため必要なバルク容量も低減できます。
このデバイスは、低電圧(UVLO)、過電流(OCP)、過熱(TSD)などのフォルトや短絡から完全に保護されています。エラー状態が解消されると、デバイスは自動的に通常動作状態に復帰します。
型番 | パッケージ | 本体サイズ(typ) |
---|---|---|
DRV8871 | HSOP (8) | 4.90mm×6.00mm |
Changes from A Revision (January 2016) to B Revision
Changes from * Revision (August 2015) to A Revision
PIN | TYPE | DESCRIPTION | ||
---|---|---|---|---|
NAME | NO. | |||
GND | 1 | PWR | Logic ground | Connect to board ground |
ILIM | 4 | I | Current limit control | Connect a resistor to ground to set the current chopping threshold |
IN1 | 3 | I | Logic inputs | Controls the H-bridge output. Has internal pulldowns (see Table 1). |
IN2 | 2 | |||
OUT1 | 6 | O | H-bridge output | Connect directly to the motor or other inductive load. |
OUT2 | 8 | |||
PGND | 7 | PWR | High-current ground path | Connect to board ground. |
VM | 5 | PWR | 6.5-V to 45-V power supply | Connect a 0.1-µF bypass capacitor to ground, as well as sufficient bulk capacitance, rated for the VM voltage. |
PAD | — | — | Thermal pad | Connect to board ground. For good thermal dissipation, use large ground planes on multiple layers, and multiple nearby vias connecting those planes. |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±6000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±750 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VM | Power supply voltage | 6.5 | 45 | V |
VI | Logic input voltage (IN1, IN2) | 0 | 5.5 | V |
fPWM | Logic input PWM frequency (IN1, IN2) | 0 | 200(2) | kHz |
Ipeak | Peak output current(1) | 0 | 3.6 | A |
TA | Operating ambient temperature(1) | –40 | 125 | °C |
THERMAL METRIC(1) | DRV8871 | UNIT | |
---|---|---|---|
DDA (HSOP) | |||
8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 41.1 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 53.1 | °C/W |
RθJB | Junction-to-board thermal resistance | 23.1 | °C/W |
ψJT | Junction-to-top characterization parameter | 8.2 | °C/W |
ψJB | Junction-to-board characterization parameter | 23 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 2.7 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
POWER SUPPLY (VM) | ||||||
VM | VM operating voltage | 6.5 | 45 | V | ||
IVM | VM operating supply current | VM = 12 V | 3 | 10 | mA | |
IVMSLEEP | VM sleep current | VM = 12 V | 10 | µA | ||
tON(1) | Turn-on time | VM > VUVLO with IN1 or IN2 high | 40 | 50 | µs | |
LOGIC-LEVEL INPUTS (IN1, IN2) | ||||||
VIL | Input logic low voltage | 0.5 | V | |||
VIH | Input logic high voltage | 1.5 | V | |||
VHYS | Input logic hysteresis | 0.5 | V | |||
IIL | Input logic low current | VIN = 0 V | –1 | 1 | μA | |
IIH | Input logic high current | VIN = 3.3 V | 33 | 100 | μA | |
RPD | Pulldown resistance | To GND | 100 | kΩ | ||
tPD | Propagation delay | INx to OUTx change (see Figure 6) | 0.7 | 1 | μs | |
tsleep | Time to sleep | Inputs low to sleep | 1 | 1.5 | ms | |
MOTOR DRIVER OUTPUTS (OUT1, OUT2) | ||||||
RDS(ON) | High-side FET on resistance | VM = 24 V, I = 1 A, fPWM = 25 kHz | 307 | 360 | mΩ | |
RDS(ON) | Low-side FET on resistance | VM = 24 V, I = 1 A, fPWM = 25 kHz | 258 | 320 | mΩ | |
tDEAD | Output dead time | 220 | ns | |||
Vd | Body diode forward voltage | IOUT = 1 A | 0.8 | 1 | V | |
CURRENT REGULATION | ||||||
VILIM | Constant for calculating current regulation (see Equation 1) | IOUT = 1 A | 59 | 64 | 69 | kV |
tOFF | PWM off-time | 25 | µs | |||
tBLANK | PWM blanking time | 2 | µs | |||
PROTECTION CIRCUITS | ||||||
VUVLO | VM undervoltage lockout | VM falls until UVLO triggers | 6.1 | 6.4 | V | |
VM rises until operation recovers | 6.3 | 6.5 | ||||
VUV,HYS | VM undervoltage hysteresis | Rising to falling threshold | 100 | 180 | mV | |
IOCP | Overcurrent protection trip level | 3.7 | 4.5 | 6.4 | A | |
tOCP | Overcurrent deglitch time | 1.5 | μs | |||
tRETRY | Overcurrent retry time | 3 | ms | |||
TSD | Thermal shutdown temperature | 150 | 175 | °C | ||
THYS | Thermal shutdown hysteresis | 40 | °C |