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參數資料
| 型號： | TPS65058RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-32 |
| 文件頁數： | 8/26頁 |
| 文件大小： | 1898K |
| 代理商： | TPS65058RGET |
RESET GENERATION AND OUTPUT MONITORING
Vcc
Vout
DCDC 1
Vout
DCDC 2
RESET
Undervoltagelockout
95 %
100 ms
Resetinactive
after 100 msif
DCDC 1 ANDDCDC 2
inregulation
Enable
DCDC 1
Enable
DCDC 2
100 ms
Resetactiveif
DCDC1 ANDDCDC 2
disabled
Resetinactiveif
DCDC 1 XORDCDC 2
disabled
Resetactiveif
DCDC1 ANDDCDC 2
Enabledbut
DCDC 1 ORDCDC 2
outofregulation
95 %
90 %
SHORT-CIRCUIT PROTECTION
THERMAL SHUTDOWN
SLVS851A – MAY 2008 – REVISED SEPTEMBER 2008................................................................................................................................................... www.ti.com
The output voltage options are:
Table 1. Output Voltage Selection
DEF_LDO
1
0
LDO1
3.3 V
LDO2
1.8 V
1.2 V
LDO3
1.8 V
1.3 V
DEF_DCDC2
1
0
DCDC2
1.8 V
1.2 V
The TPS65058 contains a monitor circuitry that monitors the outputs of the DCDC converters and applies a reset
pulse to the RESET pin. As soon as the supply voltage on the VCC pin is above the undervoltage lockout
threshold, the RESET pin is pulled low. After the enabling of both DCDC converters, the output voltages are
monitored. When both outputs are within 95% of the desired output voltage, the reset timer is started and after a
delay of 100ms the Reset output is switched to high impedance. If one of the output voltages is outside of the
regulation band (90% of the desired value) the RESET pin remains to be pulled to ground. After both outputs are
back in regulation, the 100ms timer is started, and after 100ms the RESET output is again switched to high
impedance.
Figure 19. RESET Pulse Circuit
All outputs are short circuit protected with a maximum output current as defined in the Electrical Characteristics.
As soon as the junction temperature, TJ, exceeds typically 150°C for the DCDC converters, the device goes into
thermal shutdown. In this mode, the P and N-Channel MOSFETs are turned-off. The device continues its
operation when the junction temperature falls below the thermal shutdown hysteresis again. A thermal shutdown
for one of the DCDC converters will disable both converters simultaneously.
16
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s) :TPS65058
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