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| 型号： | TPS5103IDBG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, SSOP-20 |
| 文件页数： | 36/40页 |
| 文件大小： | 1225K |
| 代理商： | TPS5103IDBG4 |
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TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
softstart
SOFTSTART sets the sequencing of the output for any possibility. The capacitor value for a start-up time can
be calculated by the following equation:
C = 2 x T (
F)
Where C is the external capacitor value, and T is the required start-up time in (ms).
standby
The controller can be switched into the standby mode by grounding the STBY terminal. When it is in standby
mode, the quiescent current is less than 1.0
A.
UVLO
The under-voltage lockout (ULVO) threshold is approximately 3.8 V. The typical hysteresis is 55 mV.
5-V switch
If the internal 5-V switch senses a 5-V input from REG5V, the internal 5-V linear regulator will be disconnected
from the MOSFET drivers. The external 5 V will be used for both the low-side driver and the high-side bootstrap,
thus, increasing the efficiency.
PWM/SKIP switch
The PWM/SKIP switch selects the output operating mode. This controller has three operational modes, PWM,
SKIP, and hysteretic. The PWM and SKIP mode control should be used for slower-transient applications.
oscillator
The oscillator gives a triangle wave by connecting an external resistor to RT and an external capacitor to CT.
The voltage amplitude is 0.43 V ~ 1.17 V. This wave is connected to the noninverting input of the PWM
comparator.
Table 1.
Comparison Table Between PWM Mode and Hysteretic Mode
MODE
PWM
HYSTERETIC
Frequency
Fixed
Not fixed
Transient response
Normal
Very fast
Feed back compensation
Need
Needless
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