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參數資料
| 型號： | TPS65167RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件頁數： | 9/41頁 |
| 文件大小： | 1270K |
| 代理商： | TPS65167RHAT |
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Enable EN
Delay GDLY
Setting the Delay Times GDLY, EN delay
dly
5 A x td
C
=
Vref
1.23 V
m
(1)
dly
5 A x 2.3 ms
C
=
= 9.3 nF
C
= 10 nF
1.23 V
m
(2)
Boost Converter
SLVS760C – APRIL 2007 – REVISED MARCH 2008
The enable is a dual function pin. It can be used as a standard enable pin that enables the device once it is
pulled high by a logic signal or connected to the REGOUT pin.
The enable can not be connected directly to Vin due to its maximum voltage rating!
If no logic control signal is available, it is also possible to connect a capacitor to this pin to set the delay time td
as shown in Figure 23 and Figure 19.
The capacitor connected to GDLY sets the delay time from the point when the boost converter Vs reaches its
nominal value to the enable of the gate voltage shaping block.
Connecting an external capacitor to the GDLY and EN pin sets the delay time. To set the delay time, the external
capacitor is charged with a constant current source of typically 5
A. The delay time is terminated when the
capacitor voltage has reached the threshold voltage of Vth = 1.230 V. The external delay capacitor is calculated:
with td = Desired delay time
Example for setting a delay time of 2.3 mS
The main boost converter operates in Pulse Width Modulation (PWM) and at a fixed switching frequency of 750
kHz The converter uses a unique fast response, voltage-mode controller scheme with feed-forward input voltage
. This achieves excellent line and load regulation (0.2% A load regulation typical) and allows the use of small
external components. To add higher flexibility to the selection of external component values the device uses
external loop compensation. Although the boost converter looks like a non-synchronous boost converter topology
operating in discontinuous conduction mode at light load, the device will maintain continuous conduction even at
light load currents. This is achieved with a novel architecture using an external Schottky diode with an integrated
MOSFET in parallel connected between SW and SUP. See the Functional Block Diagram. The intention of this
MOSFET is to allow the current to go below ground that occurs at light load conditions. For this purpose, a small
integrated P-Channel MOSFET with typically 10
RDS(on) is sufficient. When the inductor current is positive, the
external Schottky diode with the lower forward voltage will carry the current. This causes the converter to operate
with a fixed frequency in continuous conduction mode over the entire load current range. This avoids the ringing
on the switch pin as seen with standard non-synchronous boost converter, and allows a simpler compensation
for the boost converter.
Copyright 2007–2008, Texas Instruments Incorporated
17
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