A3948SLB Allegro Microsystems Inc, A3948SLB Datasheet - Page 7

• Manufacturer Part Number: A3948SLB
• Description: IC MOTOR DRIVER PWM FULL 24-SOIC
• Manufacturer: Allegro Microsystems Inc

Specifications of A3948SLB

• Applications: PWM Motor Driver
• Number Of Outputs: 1
• Current - Output: ±1.5A
• Voltage - Load: 20 V ~ 50 V
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Current: 10mA
• Operating Temperature Classification: Commercial
• Package Type: SOIC W
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PHASE, determines if the device is operating in the
forward (PHASE
RANGE, determines if V
D16) or by 10 (RANGE = D16).
MODE, selects slow (MODE
D17) current decay.
3948
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
STROBE
CLOCK
DATA
D15) or reverse (PHASE = D15) state.
Bit D15, in conjunction with
REF
Bit D16, in conjunction with
C
is divided by 5 (RANGE
Bit D17, in conjunction with
D17) or mixed (MODE =
A
D19
B
D
E
D18
device in normal mode. D18 is only used for testing
purposes. The user should never change this bit.
minimize power consumption when not in use. This
disables much of the internal circuitry including the
regulator and charge pump. On power up the serial port is
initialized to all 0s. Bit D19 should be programmed high
for 1 ms before attempting to enable any output driver.
into the shift register on the rising edge of the CLOCK
signal. Normally STROBE will be held high, only
brought low to initiate a write cycle. Refer to diagram
below and these specifications for the minimum timing
requirements.
A.DATA setup time ......................................... 15 ns
B.DATA hold time ........................................... 10 ns
C.Setup STROBE to CLOCK rising edge ....... 50 ns
D.CLOCK high pulse width ............................ 50 ns
E.CLOCK low pulse width .............................. 50 ns
F.Setup CLOCK rising edge to STROBE ....... 50 ns
G.STROBE pulse width ................................... 50 ns
D0
Bit D18 low (default) operates the
Bit D19 selects a Sleep mode to
F
G
Dwg. WP-038
Data is clocked