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| 型号： | TPS84320RUQT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PQCC47 |
| 封装： | 9 X 15 MM, 2.80 MM HEIGHT, GREEN, PLASTIC, QFN-47 |
| 文件页数： | 16/28页 |
| 文件大小： | 903K |
| 代理商： | TPS84320RUQT |
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INH/UVLO
PVIN
VIN
RUVLO1
RUVLO2
INH/UVLO
PVIN
VIN
RUVLO1
RUVLO2
INH/UVLO
VIN
PVIN
RUVLO1
RUVLO2
> 4.5 V
SLUSAH7
– SEPTEMBER 2011
Programmable Undervoltage Lockout (UVLO)
The TPS84320 implements internal UVLO circuitry on the VIN pin. The device is disabled when the VIN pin
voltage falls below the internal VIN UVLO threshold. The internal VIN UVLO rising threshold is 4.5 V(max) with a
typical hysteresis of 150 mV.
If an application requires either a higher UVLO threshold on the VIN pin or a higher UVLO threshold for a
combined VIN and PVIN, then the UVLO pin can be configured as shown in Figure 40 or Figure 41. Table 8 lists
standard values for RUVLO1 and RUVLO2 to adjust the VIN UVLO voltage up.
Figure 40. Adjustable VIN UVLO
Figure 41. Adjustable VIN and PVIN Undervoltage
Lockout
Table 8. Standard Resistor values for Adjusting VIN UVLO
VIN UVLO (V)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
RUVLO1 (kΩ)
68.1
RUVLO2 (kΩ)
21.5
18.7
16.9
15.4
14.0
13.0
12.1
11.3
10.5
9.76
9.31
Hysteresis (mV)
400
415
430
450
465
480
500
515
530
550
565
For a split rail application, if a secondary UVLO on PVIN is required, VIN must be
≥ 4.5V. Figure 42 shows the
PVIN UVLO configuration. Use Table 9 to select RUVLO1 and RUVLO2 for PVIN. If PVIN UVLO is set for less than
3.0 V, a 5.1-V zener diode should be added to clamp the voltage on the UVLO pin below 6 V.
Figure 42. Adjustable PVIN Undervoltage Lockout, (VIN
≥4.5 V)
Table 9. Standard Resistor Values for Adjusting PVIN UVLO, (VIN
≥4.5 V)
PVIN UVLO (V)
2.0
2.5
3.0
3.5
4.0
4.5
RUVLO1 (kΩ)
68.1
For higher PVIN UVLO voltages see
RUVLO2 (kΩ)
95.3
60.4
44.2
34.8
28.7
24.3
Table UV for resistor values
Hysteresis (mV)
300
315
335
350
365
385
Copyright
2011, Texas Instruments Incorporated
23
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