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參數資料
| 型號： | TPS6735IP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 160 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 14/18頁 |
| 文件大?。?/td> | 360K |
| 代理商： | TPS6735IP |
TPS6735
FIXED NEGATIVE 5V 200mA INVERTING DC/DC CONVERTER
SLVS141A JULY 1996 REVISED JANUARY 1997
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
SS clamp
The SS clamp circuit limits the signal level on error-amplifier output during start-up. The voltage on SS is
amplified and used to override the error-amplifier output until it rises above that output, at which point the error
amplifier takes over. This prevents the input to the PWM comparator from exceeding its common-mode range
(i.e., error amplifier output too high to be reached by the current ramp) by limiting the maximum voltage on the
error-amplifier output during start-up.
Soft start causes the output voltage to increase to the regulation point at the controlled rate. 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. A soft-start cycle is
initiated when either the enable (EN) signal is switched high or an overcurrent fault condition triggers the
discharge of the soft-start capacitor.
undervoltage lockout (UVLO)
The supply voltage is fed through a voltage divider to the input of the UVLO and compared to a reference. The
undervoltage-lockout logic prevents the MOSFET from turning on while the supply voltage is below the
undervoltage-lockout voltage threshold, and once the supply voltage on VCC is above the threshold, an SS cycle
is initiated.
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 (see Note 1)
0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OUT to VCC
12.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FB (see Note 1)
25 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SS, COMP, EN voltage range (see Note 1)
0.3 V to VCC +0.3 V
. . . . . . . . . . . . . . . . . . . .
Peak switch current
2 A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference current
2.5 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total 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 1,6mm (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.
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage
4
6.2
V
Decoupling capacitor
1
F
Input capacitor
47
F
Reference capacitor
10
F
Output capacitor
100
F
Compensation capacitor
82
pF
Inductor
10
H
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