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參數(shù)資料
| 型號(hào)： | TPIC0108BDWP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 連接器附件 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 205K |
| 代理商： | TPIC0108BDWP |
TPIC0108B
PWMCONTROL INTELLIGENT H-BRIDGE
SLIS068 – NOVEMBER1998
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
protective functions and diagnostics
over current/short circuit
The TPIC0108B detects shorts to V
CC
, ground, or across the load being driven, by comparing the V
DS
voltage
drop across the DMOS outputs against the threshold voltage. The DMOS outputs of the TPIC0108B will be
disabled and the fault flags will be generated 10
μ
s after an over-current or short-circuit fault is detected. This
10
μ
s delay is long enough to serve as a de-glitch filter for high current transients, yet short enough to prevent
damage to the DMOS outputs. The DMOS outputs remain latched off until either IN1 or IN2 input is toggled.
In cases where the outputs have a continuous short-to-ground or when enabled from quiescent mode with a
short-to-ground already exists (current rise time faster than 0.5 A/
μ
s in both instances), the over-current
shutdown threshold will decrease to 3 A to reduce power dissipation. This reduction to 3 A is achieved since
the DMOS outputs will not be fully enhanced when the over-current threshold is reached if the current rise time
exceeds 0.5 A/
μ
s. Over-current and/or short-circuit protection is provided up to V
CC
= 16.5 V and a junction
temperature of 90
°
C.
over temperature
The TPIC0108B disables all DMOS outputs and the fault flags will be set when T
J
≥
140
°
C (min.). The DMOS
outputs remain latched off until either IN1 or IN2 input is toggled.
under voltage
The TPIC0108B disables all DMOS outputs when V
CC
≤
V
(UVCC)
. The outputs will be re-enabled when
V
CC
≥
V
(UVCC)
. No fault flags are set when under-voltage lockout occurs.
over voltage
In order to protect the DMOS outputs from damage caused by excessive supply voltage, the TPIC0108B
disables all outputs when V
CC
≥
V
(OVCC)
. Once V
CC
≤
V
(OVCC)
, either IN1 or IN2 input must be toggled to
re-enable the DMOS outputs.
cross conduction
Monitoring circuitry for each transistor detects whether the particular transistor is active to prevent the HSD or
LSD of the corresponding half H-bridge from conducting.
open circuit
During operation, the bridge current is controlled continuously. If the bridge current is >10 mA (min.) for a period
>1 ms (min.), the fault flags are set. However, the output transistors will not be disabled.
All limits mentioned are typical values unless otherwise noted.
If a short circuit occurs (i.e., the over-current detection circuitry is activated) at a supply voltage higher than 16.5 V and a junction temperature
higher than 90
°
C, damage to the device may occur.
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