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| 型号： | TPS51727RHARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 11/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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DETAILED DESCRIPTION
FUNCTIONAL OVERVIEW
Multi-Phase, PWM Operation
www.ti.com ..................................................................................................................................................... SLUS806B – APRIL 2008 – REVISED JANUARY 2009
The TPS51727 is a DCAP+ mode adaptive on-time converter. The output voltage is set using the 5-bit VID
code defined in Table 3. "VID-on-the-fly" transitions are supported with the slew rate controlled by a single
resistor on the ISLEW pin. Two powerful integrated drivers support output currents in excess of 50 A. The
converter enters single phase mode under PCNT control to optimize light-load efficiency. Four switching
frequency selections are provided in 100-kHz increments from 200-kHz to 500-kHz per phase to enable
optimization of the power chain for the cost, size and efficiency requirements of the design. (See Table 2)
Table 2. Frequency Selection
Table
TONSEL
FREQUENCY
VOLTAGE
(kHz)
(VTONSEL) (V)
GND
200
VREF
300
3.3
400
5
500
In adaptive on-time converters, the controller varies the on-time as a function of input and output voltage to
maintain a nearly constant frequency during steady-state conditions. In conventional voltage-mode constant
on-time converters, each cycle begins when the output voltage crosses to a fixed reference level. However, in
the TPS51727, the cycle begins when the current feedback reaches an error voltage level which is the amplified
difference between the DAC voltage and the feedback voltage.
This approach has two advantages:
1. The amplifier DC gain sets an accurate linear load-line; this is required for many processing applications.
2. The error voltage input to the PWM comparator is filtered to improve the noise performance.
In a steady-state condition, the two phases of the TPS51727 switch 180° out-of-phase. The phase displacement
is maintained both by the architecture (which does not allow both top gate drives to be on in any condition) and
the current ripple (which forces the pulses to be spaced equally). The controller forces current sharing adjusting
the on-time of each phase. Current balancing requires no user intervention, compensation, or extra components.
Referring to Figure 1, in dual-phase steady state, continuous conduction mode, the converter operates as
follows: Starting with the condition that both top MOSFETs are off and both bottom MOSFETs are on, the
summed current feedback (VCMP) is higher than the error amplifier output (VDROOP). VCMP falls until it hits VDROOP,
which contains a component of the output ripple voltage. The PWM comparator senses where the two
waveforms cross and triggers the on-time generator.
Copyright 2008–2009, Texas Instruments Incorporated
19
Product Folder Link(s): TPS51727
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