參數(shù)資料
型號(hào)： TPS6734IP
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING REGULATOR, 170 kHz SWITCHING FREQ-MAX, PDIP8
封裝： ROHS COMPLIANT, PLASTIC, DIP-8
文件頁(yè)數(shù)： 18/22頁(yè)
文件大?。?/td> 479K
代理商： TPS6734IP
TPS6734I
FIXED 12-V 120-mA BOOST-CONVERTER SUPPLY
SLVS127A – AUGUST 1995 – REVISED JANUARY 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
soft start
Soft start causes the output voltage to increase to the regulation point at a controlled rate of rise. The voltage
on the charging soft-start capacitor gradually raises the clamp on the error-amplifier output voltage, limiting
surge currents at power-up by increasing the current-limit threshold on a cycle-by-cycle basis. Even if SS has
no capacitor installed, some distributed capacitance will always be present. A soft-start cycle is initiated when
either the enable signal (EN) is switched high, or an overcurrent fault condition triggers the discharge of the
soft-start capacitor.
overcurrent comparator
The overcurrent comparator monitors the current in the power switch. The comparator trips and initiates a
soft-start cycle if the power-switch current exceeds 1.5-A peak. On each clock cycle, the power switch turns on
and attempts to deliver current until the overcurrent limits are exceeded.
enable (EN)
A logic low on EN puts the TPS6734 in shutdown mode. In shutdown, the output power switch, voltage
reference, and other functions are shut off, the supply current is reduced to 3
A maximum, and the soft-start
capacitor is discharged through a 1-M
resistance. The output voltage falls to a diode drop below the input
voltage because of the current path from input to output through the inductor and diode.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
D
725 mW
5.8 mW/
°C
464 mW
377 mW
P
1175 mW
9.4 mW/
°C
752 mW
611 mW
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Pin voltages: VCC, OUT (see Note 1)
– 0.3 V to 15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SS, COMP, EN (see Note 1)
– 0.3 V to VCC+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak switch current
1.5 A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference current
2.5 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA
–40
°C to 85°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg
–65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 s
260
°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to network terminal ground.
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