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TPS6209718 Datasheet(PDF) 9 Page - Texas Instruments

Part # TPS6209718
Description  TPS62097 2-A High Efficiency Step-Down Converter with iDCS-Control, Forced PWM Mode and Selective Switching Frequency
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS6209718 Datasheet(HTML) 9 Page - Texas Instruments

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background image
L
V
V
V
V
t
I
2
f
OUT
IN
OUT
IN
2
ON
OUT
PSM
-
´
´
´
=
EN
V
OUT
PG
Disable
Enable
MODE
Detection
Soft Startup
TPS62097
www.ti.com
SLVSCD6 – DECEMBER 2015
Device Function Modes (continued)
Once the EN pin is pulled high, the IC enables internal circuit blocks and prepares to ramp the output up. The
period between the rising edge of the EN pin and the beginning of the power stage switching is called the MODE
detection time, typically 50µs. During the MODE detection time period, shown in Figure 3, the PWM switching
frequency and operating mode are set by the MODE pin status, as shown in Table 1.
The PWM switching frequency can't be changed after the detection time period. Only when the device is set in
PWM/PSM mode during the MODE detection time period (MODE = AGND), it is possible to switch between
PWM/PSM and forced PWM operation modes by toggling the MODE pin with a GPIO pin of a micro-controller,
for example. The other four MODE pin selections force the device in PWM mode only.
Figure 3. Power Up Sequence
Table 1. Switching Frequency and Mode Selection
Typical PWM
Resistance at MODE pin
Toggle MODE pin after
Switching
ON-Time Equation
Operating Mode
(E24 EIA Value)
MODE detection
Frequency (MHz)
1.50
8.2k
Ω ±5%
No
tON = 667ns x VOUT / VIN
Forced PWM
1.75
18k
Ω ±5%
No
tON = 571ns x VOUT / VIN
Forced PWM
PWM/PSM and
2.00
AGND
Yes
tON = 500ns x VOUT / VIN
Forced PWM
2.25
39k
Ω ±5%
No
tON = 444ns x VOUT / VIN
Forced PWM
2.50
75k
Ω ±5% or Open
No
tON = 400ns x VOUT / VIN
Forced PWM
Connecting the MODE pin to AGND with a resistor or leaving the MODE pin open forces the device into PWM
mode for the whole load range. The device operates with a fixed switching frequency that allows simple filtering
of the switching frequency for noise sensitive applications. In forced PWM mode, the efficiency is lower than that
of PSM at light load.
Connecting the MODE pin to the AGND pin enables Power Save Mode with an automatic transition between
PWM and Power Save Mode. As the load current decreases and the inductor current becomes discontinuous,
the device enters Power Save Mode operation automatically. In Power Save Mode, the switching frequency is
reduced and estimated by Equation 2. In Power Save Mode, the output voltage rises slightly above the nominal
output voltage, as shown in Figure 13. This effect is minimized by increasing the output capacitor.
(2)
When the device operates close to 100% duty cycle mode, the TPS62097 can't enter Power Save Mode
regardless of the load current if the input voltage decreases to typically 15% above the output voltage. The
device maintains output regulation in PWM mode.
Copyright © 2015, Texas Instruments Incorporated
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