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| 型号： | LTC4366HTS8-2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC SURGE STOPPER HV TSOT-23-8 |
| 标准包装： | 2,500 |
| 电压 - 工作： | 9V |
| 电压 - 箝位： | 可调式 |
| 技术： | 混合技术 |
| 电路数： | 1 |
| 应用： | 自动 |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 供应商设备封装： | TSOT-23-8 |
| 包装： | 带卷 (TR) |
LTC4366-1/LTC4366-2
APPLICATIONS INFORMATION
Table 1. Electrical Parameters Used in Design Example
SYMBOL
V Z(OUT)
V UVLO2
I VSS(CP)
I VSS(AMP)
I VDD(STHI)
I GATE(ST)
V UVLO1
PARAMETER
OUT Shunt Reg. Voltage
OUT Undervoltage Lockout 2
V SS Pin Current – Charge Pump On
V SS Pin Current – Regulation Amplifier On
V DD Pin Current – Start-Up, Gate High
GATE Pin Current – Start-Up
OUT Undervoltage Lockout 1
CONDITIONS
I = 1mA, BASE = 0V
Rising
GATE Open, V DD = 7V, OUT = 0V
GATE = OUT = 0V
Rising
TYP
5.7V
4.75V
–160μA
–45μA
9μA
–7.5μA
2.55V
MAX
6.0V
4.9V
–230μA
–72μA
13μA
–11μA
2.75V
R SS(MAX) =
AfterthechargepumpisactivetheV SS currentincreases
to 160μA (worst-case 230μA, see Table 1) current while
the final value OUT voltage is equal to the minimum supply
voltage. The C1 voltage is clamped at 5.7V (worst-case
6.0V):
V IN(MIN) – V Z(OUT)
I VSS(CP)
Step 3: Find R SS(MAX)
In some cases this value for R SS is too large to charge C1
and power the overvoltage amplifier before the maximum
input voltage passes to the output. The voltage at the V SS
pin when I RIN = I RSS is called the match point (V SS(MATCH) ).
Choosing the match point (with supply at the maximum)
sufficiently below V REG (by at least 7V), allows C1 to charge
up in time to protect the load from overvoltage:
R SS(MAX) =
18V – 6V
230μA
= 52.3k
R SS(MAX) =
R IN ? ( V REG – 7V )
V IN(MAX) ? 5V ? V REG
V IN(MIN) – V UVLO2 ? V D ? V TH ? ( I SS(AMP) ? R SS )
I VDD(STHI)
287k ? ( 43V – 7V )
R SS(MAX) = = 51.1k
18V – 4.9V ? 0.58V ? 5V ? ( 72μA ? 51.1k )
R IN =
18V ? 4.9V ? 0.58V ? 5V ? ( 72μA ? 52.3k )
R IN(MAX) =
294k ? ( 43V – 7V )
Step2:DetermineR IN
The value for resistor R IN is calculated using the calculated
R SS value. R IN is chosen to provide enough headroom to
sufficiently charge C1 to 4.9V the maximum undervoltage
lockout 2 threshold (V UVLO2 ) which starts the charge pump.
The parameters that determine R IN include: minimum
supply voltage, the final C1 voltage, MOSFET threshold
voltage, R SS , 72μA maximum V SS pin current (regulation
amplifier on, I VSS(AMP) ), and finally the 13μA maximum
start-up current in the V DD pin (I VDD(STHI) ):
R IN(MAX) =
13μA
R IN(MAX) = 287k
250V – 5V – 43V
In this case the R SS value of 52.3k calculated in Step 1
is too large.
Step 4: Iterate Smaller R SS
Using 51.1k (R SS(MAX) ) as the next guess for R SS , we can
now calculate R IN and R SS(MAX) :
13μA
R IN = 294k
R SS(MAX) = 52.3k
250V – 5V ? 43V
In this case the R SS value of 51.1k is less than R SS(MAX)
and the solution is acceptable.
17
For more information www.linear.com/LTC4366
436612fd
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