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SLTS278J November 2010 – March 2020 PTH08T250W

PRODUCTION DATA.

封裝選項

請參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。

機械數(shù)據(jù) (封裝 | 引腳)

BCU|22
ECT|22
ECU|22

散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)

訂購信息

slts278j_oa

9.1.1.1 Adjusting the Output Voltage

The V_o Adjust control sets the output voltage of the PTH08T250W. The adjustment range of the PTH08T250W is 0.7 V to 3.6 V. The adjustment method requires the addition of a single external resistor, R_SET, that must be connected directly between pins V_o Adjust (pin 18) and AGND (pin 4). Table 2 gives the standard value of the external resistor for a number of standard voltages, along with the actual output voltage that this resistance value provides.

For other output voltages, the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 3. Figure 14 shows the placement of the required resistor.

Equation 1. PTH08T250W q_rset_lts278.gif

Table 2. Standard Values of R_SET for Standard Output Voltages

V_O (STANDARD) (V)	R_SET (STANDARD VALUE) (kΩ)	V_O (ACTUAL) (V)
3.3	1.62	3.298
2.5	5.23	2.498
2.0	9.76	1.997
1.8	12.7	1.798
1.5	19.6	1.508
1.2	35.7	1.199
1.0 ⁽¹⁾	63.4	1.001
0.7 ⁽¹⁾	Open	0.700

(1) The maximum input voltage is limited to (V_O × 12) or 14 V, whichever is less. The maximum allowable input voltage is a function of switching frequency, and may increase or decrease when the SmartSync feature is utilized. See the SmartSync section for further guidance.

1. R_SET: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/°C (or better). Connect the resistor directly between pins 18 and 4, as close to the regulator as possible, using dedicated PCB traces.

2. Never connect capacitors from V_O Adjust to either + Sense, GND, or V_O. Any capacitance added to the V_O Adjust pin affects the stability of the regulator.

Figure 14. V_O Adjust Resistor Placement

Table 3. Output Voltage Set-Point Resistor Values

V_O REQUIRED (V)	R_SET (kΩ)	V_O REQUIRED (V)	R_SET (kΩ)	V_O REQUIRED (V)	R_SET (kΩ)
0.70 ⁽¹⁾	Open	1.50	19.6	2.60	4.64
0.75 ⁽¹⁾	412	1.60	16.9	2.70	4.02
0.80 ⁽¹⁾	205	1.70	14.7	2.80	3.57
0.85 ⁽¹⁾	133	1.80	12.7	2.90	3.09
0.90 ⁽¹⁾	97.6	1.90	11.0	3.00	2.67
0.95 ⁽¹⁾	78.7	2.00	9.76	3.10	2.26
1.00 ⁽¹⁾	63.4	2.10	8.66	3.20	1.96
1.10 ⁽¹⁾	46.4	2.20	7.50	3.30	1.62
1.20	35.7	2.30	6.65	3.40	1.30
1.30	28.7	2.40	5.90	3.50	1.02
1.40	23.7	2.50	5.23	3.60	0.768

(1) For output voltages less than 1.2 V, the output ripple may increase (up to 2X) when operating at input voltages greater than (V_O × 12). Adjusting the switching frequency using the SmartSync feature may increase or decrease this ratio. See the SmartSync section for further guidance.