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| 型号： | ZXLD1374EST20TC |
| 厂商： | Diodes Inc |
| 文件页数： | 7/39页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BUCK BOOST 20TSSOP |
| 标准包装： | 1 |
| 拓扑： | 低端，PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 300kHz ~ 1MHz |
| 电源电压： | 6.3 V ~ 60 V |
| 输出电压： | 60V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | ZXLD1374EST20TCDIDKR |
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A Product Line of
Diodes Incorporated
ZXLD1374
Electrical Characteristics (cont.) (V IN = V AUX = 12V, @T A = +25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Output Parameters
V FLAGL
I FLAGOFF
FLAG Pin Low Level Output Voltage
FLAG Pin Open-Drain Leakage Current
Output sinking 1mA
V FLAG = 40V
Normal operation
Out of regulation (V SHP out of range)
(Note 12)
V IN under-voltage (V IN < 5.6V)
4.2
3.3
3.3
4.5
3.6
3.6
0.5
1
4.8
3.9
3.9
V
μA
V STATUS
STATUS Flag No-Load Output Voltage
(Note 13)
Switch stalled (t ON or t OFF > 100μs)
LX over-voltage state (V LX > 60V)
3.3
2.4
3.6
2.7
3.9
3.0
V
Over-temperature (T J > 125°C)
Excess sense resistor current
(V SENSE > 0.375V)
Excessive switch current (I SW >1.5A)
1.5
0.6
0.6
1.8
0.9
0.9
2.1
1.2
1.2
R STATUS
Output Impedance of STATUS Output
Normal operation
10
k ?
Low Side Switch Output (LX pins tied together)
I LX-LG
Low Side Switch Leakage Current
Output stage off, V LX = 60V
(Note 14)
60
μA
R DS(ON)
t PDHL
t PDLH
t LXR
t LXF
LX Pin MOSFET on Resistance
Propagation Delay High-Low
Propagation Delay Low-High
LX Output Rise Time
LX Output Fall Time
I LX = 1.5A (t ON < 100μs)
V SENSE = 225mV ± 30%, C L = 680pF,
R L = 120 Ω
0.5
86
131
208
12
0.8
Ω
ns
ns
ns
ns
Time to assert ‘STALL’ flag and
t STALL
warning on STATUS output
LX low or high
100
170
μs
(Note 15)
LED Therm al control circuit (TADJ) parameters
V TADJH
V TADJL
I TADJ
Upper Threshold Voltage
Lower Threshold Voltage
TADJ Pin Input Current
Onset of output current reduction (V TADJ
falling)
Output current reduced to <10% of set value
(V TADJ falling)
V TADJ = 1.25V
560
380
625
440
690
500
1
mV
mV
μA
Notes:
12. Flag is asserted if V SHP <2.5V or V SHP >3.5V
13. In the event of more than one fault/warning condition occurring, the higher priority condition will take precedence. E.g. ‘Excessive coil current’
and ‘Out of regulation’ occurring together will produce an output of 0.9V on the STATUS pin. The voltage levels on the STATUS output assume
the Internal regulator to be in regulation and V ADJ <=V REF . A reduction of the voltage on the STATUS pin will occur when the voltage on V IN is near –
this is due to the feedback loop increasing the sense voltage.
14. With the device still in switching mode the LX pin has an over-voltage detection circuit connected to it with a resistance of approximately 1M Ω .
15. If t ON exceeds t STALL , LX turns off and then an initiate a restart cycle occurs. During this phase, ADJ is grounded internally and the SHP pin is
switched to its nominal operating voltage, before operation is allowed to resume. Restart cycles will be repeated automatically until the operating
conditions are such that normal operation can be sustained. If t OFF exceeds t STALL , the switch will remain off until normal operation is possible.
ZXLD1374
Document number: DS35032 Rev. 3 - 2
7 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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