Pin No.
24
25
26
27
28
Pin Name
NC
TRB_2
VINTK
BIAS
MUTE
No connection
Description
Connect to external transistor base
Tracking driver input
Bias input
Mute control
Notes: The indicated polarities for the output pins are means polarity to inputs.
Always ensure that V
CC
PVCC
FUNCTION DESCRIPTION
Operation notes
1) This IC has a built in thermal shutdown circuit that mutes the output current when the chip temperature
reaches 135°C (typ.). The hysteresis is set to 25
°C
(typ.), so the driver circuits start up again when the chip
temperature falls to 120°C (typ.).
2) The driver buffer is switched off when the supply voltage falls below 3.6V (typ.), and is switched back on when
the voltage reaches 3.8V (typ.) again.
3) Bias pin (pin27) should be pulled up to more than 1.2V. In case the bias pin voltage is pulled down below 0.9V
(Typ), the output current is muted.
4) The stand by circuit logic is active low.
5) Mute is applied when the buffer pin voltage falls below 1.0V (typ.). Normally, operate with this pin at1.8V at
least.
6) Connect a bypass capacitor between the bases of the power supply pins of this IC.
7) Tray driver logic input:
FWD(pin6)
L
L
H
H
REV(pin7)
L
H
L
H
VOTR+(pin10)
OPEN
L
H
L
VOTR-(pin9)
OPEN
H
L
L
Function
Open mode
Reverse mode
Forward mode
Brake mode
The design of 6,7 pin, consider the driver upper and lower unable ducting at the same time, be sure to do it, the
motor forward and reverse input by the open mode, and the interval of the open mode is more than 10ms.
Output high level voltage VOL+, VOL- ,varied with the motor controller, it can output 3 times voltage of
21pin, and in high level. In this time, the low level voltage input power pipe as the output saturation voltage.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2009.07.16
Page 5 of 8
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