參數(shù)資料
型號(hào)： UPD168116AK9-9B4-A
廠商： NEC Corp.
英文描述： 7-CHANNEL H-BRIDGE DRIVER WITH A MICRO STEP FUNCTION SUPPORTING PULSE INPUT
中文描述： 7通道H -橋甲微步支脈沖輸入功能驅(qū)動(dòng)程序
文件頁(yè)數(shù)： 16/26頁(yè)
文件大?。?/td> 256K
代理商： UPD168116AK9-9B4-A
Data Sheet S16967EJ1V0DS
16
μ
PD168116A
(2) ch7
Connect the current detection circuit between the source of the driver low side and GND. Because the circuit is
configured to detect current directly, connect a detection resistor of low resistance (1
maximum) .
The current that flows into the output is {200 mV (reference voltage) /FB
7
pin resistance} (when SEL
7
= H) .
Example)
Where FB
7
= 0.5
Output current = 200 (mV) /0.5 (
)
= 400 (mA)
This means constant current driving of 400 mA.
Because only ch7 employs the linear drive mode and directly detects the output current, the current accuracy is
determined only by the external resistor and the offset of the current control amplifier.
8.7 Undervoltage Lockout (UVLO) Circuit
This function is to forcibly stop the operation of the IC to prevent malfunctioning if V
DD
drops.
When UVLO operates, the IC is in the reset status.
If V
DD
drops abruptly in the order of several
μ
s, this function may not operate.
8.8 Overheat Protection (TSD) Circuit
This function is to forcibly stop the operation of the IC to protect it from destruction due to overheating if the chip
temperature of the IC rises.
The overheat protection circuit operates when the chip temperature rises to 150
°
C or more. When overheat is
detected, all the circuits are stopped. When RESETB = L or when UVLO is detected, the overheat protection circuit
does not operate.
8.9 Power Up Sequence
This IC has a circuit that prevents current from flowing into the V
M
pin when V
DD
= 0 V. Therefore, the current that
flows into the V
M
pin is cut off when V
DD
= 0 V.
Because the V
DD
pin voltage and V
M
pin voltage are monitored, a current of 3
μ
A MAX. flows into the V
M
pin when
V
DD
is applied.
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