LB11948T Datasheet, PDF (4/12 Pages) Sanyo Semicon Device – Monolithic Digital IC PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver

Pin Functions
Pin No.
1
2
3
4
5
Symbol
OUT1−
OUT1
NC
NC
D−GND
6
E1
7
VS1
8
NC
9
V_CC
10
CR
11
VREF1
12
NC
13
ENABLE1
14
PHASE1
15
ST
16
NC
17
1VREG
18
PHASE2
19
ENABLE2
20
VREF2
21
GND
22
PGND
23
NC
24
VS2
25
E2
26
D−GND
27
NC
28
NC
29
OUT2
30
OUT2−
LB11948T
Functional descriptions
Output
Output
Unused
Unused
Lower side internal diode anode connection
Constant current control sensing
The motor current is set by the value of the sensing resistor Re connected between the E1 pin and ground.
The current is set according to the following equation: I_O = VREF/Re (A)
VS power supply
Unused
V_CC power supply
RC oscillator connection
Current setting system reference voltage input
VREF1 voltage range: 0 to 0.5 V
Unused
Logic level input
The output is turned off when ENABLE1 is low, and the outputs are turned on (operating state) when ENABLE2 is high.
Logic level input: phase switching
When PHASE1 = high: Output pin states: OUTA: high, OUTA-: low.
When PHASE1 = low: Output pin states: OUTA: low, OUTA-: high.
Standby mode setting
When ST = high: the IC operates in normal operating mode.
When ST = low: the IC operates in standby mode. The V_S and V_CC current drain levels are under 1 µA in this mode.
Unused
1 V regulator circuit output
The LB11948 includes an internal 1 V regulator circuit, and this pin is the output from that circuit. The VREF1 and VREF2
reference voltages can be set by voltage dividing the 1 V regulator output.
Logic level input: phase switching
When PHASE2 = high: Output pin states: OUTA: high, OUTA-: low.
When PHASE2 = low: Output pin states: OUTA: low, OUTA-: high.
Logic level input
The output is turned off when ENABLE1 is low, and the outputs are turned on (operating state) when ENABLE2 is high.
Current setting reference voltage input
VREF2 voltage range: 0 to 0.5 V
Ground (small signal circuit system ground)
Power system ground (high current circuit system ground)
Unused
VS power supply
Constant current control sensing
The motor current is set by the value of the sensing resistor Re connected between the E2 pin and ground.
The current is set according to the following equation: I_O = VREF/Re (A)
Lower side internal diode anode connection
Unused
Unused
Output
Output
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