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| 型号： | TPS54550PWPRG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 9/31页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 16HTSSOP |
| 产品培训模块： | Understanding SWIFT Step Down Dc/Dc Converters |
| 标准包装： | 2,000 |
| 系列： | SWIFT™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 12 V |
| 输入电压： | 4.5 V ~ 20 V |
| 频率 - 开关： | 250kHz，500kHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-HTSSOP |
| 配用： | 296-19743-ND - EVALUATION MODULE FOR TPS54550 |
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Switching Frequency (RT)
The TPS54550 has an internal oscillator that
operates at twice the PWM switching frequency. The
internal oscillator frequency is controlled by the RT
pin. Grounding the RT pin sets the PWM switching
frequency to a default frequency of 250 kHz. Floating
the RT pin sets the PWM switching frequency to
500kHz.
Connecting a resistor from RT to AGND sets the
frequency according to Equation 4 (see Figure 13 ).
SLVS623A – MARCH 2006 – REVISED APRIL 2006
The RT pin controls the SYNC pin functions. If the
RT pin is floating or grounded, SYNC is an output. If
the switching frequency has been programmed using
a resistor from RT to AGND, then SYNC functions as
an input.
The internal voltage ramp charging current increases
linearly with the set frequency and keeps the feed
forward modulator constant (Km = 8) regardless of
the frequency set point.
RT(k W ) +
?
46000
s(kHz)–35.9
(4)
Table 2. Switching Frequency, SYNC and RT Pins
SWITCHING FREQUENCY
250 kHz, internally set
500 kHz, internally set
Externally set to 250 kHz to 700 kHz
Externally synchronized frequency
SYNC PIN
Generates SYNC output signal
Generates SYNC output signal
Terminate to quiet ground with 10-k ?
resistor.
Synchronization Signal
RT PIN
AGND
Float
R = 215 k ? to 69 k ?
Use 110 k ? when RT floats and 237 k ? when RT is
grounded and using the sync out signal of another
TPS54550. Set RT resistor equal to 90% to 110% of
external synchronization frequency.
180 ° Out of Phase Synchronization (SYNC)
The SYNC pin is configurable as an input or as an
output, per the description in the previous section.
When operating as an input, the SYNC pin is a
falling-edge triggered signal (see Figure 3 and
falling edge is approximately 180 ° out of phase with
the rising edge of the PH pins. Thus, two TPS54550
devices operating in a system can share an input
capacitor and draw ripple current at twice the
When operating the two TPS54550 devices 180 ° out
of phase, the total RMS input current is reduced,
decreasing the amount of input capacitance needed
and increasing efficiency.
When synchronizing a TPS54550 to an external
signal, the timing resistor on the RT pin must be set
so that the oscillator is programmed to run at 90% to
110% of the synchronization frequency.
NOTE: Do not use synchronization input for designs
with output voltages > 10 V.
frequency of a single unit.
VI(SYNC)
VO(PH)
Figure 3. SYNC Input Waveform
9
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