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參數(shù)資料
| 型號(hào)： | LTC3496IUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2300 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 296K |
| 代理商： | LTC3496IUFD#TRPBF |
LT3496
5
3496f
VCAP-LED Threshold vs
Temperature
PMOS Turn On Waveforms
PMOS Turn Off Waveforms
PIN FUNCTIONS
PWM1,PWM2,PWM3(Pins1,28,27):PulseWidthModu-
lated Input. Signal low turns off the respective converter,
reduces quiescent supply current and causes the VC pin
for that converter to become high impedance. PWM pin
must not be left oating; tie to VREF if not used.
VREF (Pin 2): Reference Output Pin. Can supply up to
200A. The nominal Output Voltage is 2V.
CTRL1, CTRL2, CTRL3 (Pins 5, 4, 3): LED Current Ad-
justment Pins. Sets voltage across external sense resistor
between CAP and LED pins of the respective converter.
Setting CTRL voltage to be less than 1V will control the
current sense voltage to be one-tenth of CTRL voltage. If
CTRL voltage is higher than 1V, the default current sense
voltage is 100mV. The CTRL pin must not be left oating.
FADJ (Pin 6): Switching Frequency Adjustment Pin. Set-
ting FADJ voltage to be less than 1V will adjust switching
frequency up to 2.1MHz. If FADJ voltage is higher than
1V, the default switching frequency is 2.1MHz. The FADJ
pin must not be left oating.
VC1, VC2, VC3 (Pins 9, 8, 7): Error Amplier Compensa-
tion Pins. Connect a series RC from these pins to GND.
OVP1, OVP2, OVP3 (Pins 12, 11, 10): Open LED Protec-
tion Pins. A voltage higher than 1V on OVP turns off the
internal main switch of the respective converter. Tie to
ground if not used.
TG1, TG2, TG3 (Pins 13, 17, 24): The Gate Driver Output
Pin for Disconnnect P-Channel MOSFET. One for each
converter. When the PWM pin is low, the TG pin pulls up
to CAP to turn off the external MOSFET. When the PWM
pin is high, the external MOSFET turns on. CAPn-TGn is
limited to 7V to protect the MOSFET. Leave open if the
external MOSFET is not used.
LED1, LED2, LED3 (Pins 14, 18, 23): Noninverting Input
of Current Sense Error Amplier. Connect directly to LED
current sense resistor terminal for current sensing of the
respective converter
CAP1, CAP2, CAP3 (Pins 15, 19, 22): Inverting Input of
Current Sense Error Amplier. Connect directly to other
terminal of LED current sense resistor terminal of the
respective converter.
SW1, SW2, SW3 (Pins 16, 20 21): Switch Pins. Collector
of the internal NPN power switch of the respective con-
verter. Connect to external inductor and anode of external
Schottky rectier of the respective converter. Minimize
the metal trace area connected to this pin to minimize
electromagnetic interference.
VIN (Pin 25): Input Supply Pin. Must be locally bypassed.
Powers the internal control circuitry.
TEMPERATURE (
°C)
–50
V
CAP-LED
THRESHOLD
(mV)
101
102
103
25
75
3496 G10
100
99
–25
0
50
100
125
98
97
CTRL = 1.2V
VCAP = 24V
5V
0V
PWM
40V
30V
TG
200ns/DIV
VCAP = 40V
3496 G11
200ns/DIV
VCAP = 40V
3496 G12
5V
0V
PWM
40V
30V
TG
(TA = 25°C unless otherwise noted)
TYPICAL PERFORMANCE CHARACTERISTICS
相關(guān)PDF資料 |
PDF描述 |
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| LTC3496EUFD#PBF | SWITCHING CONTROLLER, 2300 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3496EUFD#TRPBF | SWITCHING CONTROLLER, 2300 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3521EFE#TRPBF | SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO20 |
| LTC3521EUF#TRPBF | SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3521IFE#PBF | SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO20 |
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