500ns/DIV3482 TA01b
Input Voltage (V IN ) ....................................................16V V OUT1, SW Voltage ....................................................48V
V OUT2, PUMP , MONIN, APD Voltage
..........................90V FB Voltage ...................................................................5V SHDN, f SET , CTRL Voltage .........................................16V MON Voltage .............................................................12V Operating Temperature Range (Note 2) ....................................................–40°C to 85°C Maximum Junction Temperature ..........................125°C Storage Temperature Range ...................–65°C to 125°C
(Note 1)
The ● denotes the specifi cations which apply over the full operating temperature range, otherwi specifi cations are at T A = 25°C. V IN = 3V, V S H D N = 3V unless otherwi noted.
PARAMETER
CONDITIONS
实习生鉴定评语MIN TYP MAX UNITS
Minimum Operating Voltage 2.5
V Maximum Operating Voltage 16
V Feedback Voltage CTRL = 1.5V
● 1.2151.200
1.235 1.2551.260V V Feedback Line Regulation 0.0250.07%/V FB Pin Bias Current ●哲学是什么
30100nA Supply Current FB = 1.3V, Not Switching
V S H D N = 0 3.30.1 4.00.5mA µA Switching Frequency f SET = 0V f SET = 2V 5801.06501.17501.3kHz MHz Maximum Duty Cycle f SET = 0V 95%Switch Current Limit 280
360420mA Switch V CESAT
I SW = 150mA 130220mV Switch Leakage Current SW = 5V
声级
2µA Schottky Forward Voltage I SCHOTTKY = 150mA 880
mV Schottky Rever Leakage V OUT1 – SW = 50V
5
µA SHDN Voltage High
1.5V
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W W W
U 16151413
5678TOP VIEW
17
UD PACKAGE
护士长
16-LEAD (3mm × 3mm) PLASTIC QFN 9
1011124
321NC APD MONIN V OUT2SHDN V IN GND GND
M O N
f S E T
F B成长的滋味作文800字
C T R L
V O U T 1
P U M P
S W
S W T JMAX = 125°C, θJA = 68°C/W, θJC = 4.2°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
LEAD FREE FINISH TAPE AND REEL PART MARKING*PACKAGE DESCRIPTION
TEMPERATURE RANGE LT3482EUD#PBF LT3482IUD#PBF
LT3482EUD#TRPBF LT3482IUD#TRPBF
LCFG LCFG
16-Lead (3mm × 3mm) Plastic QFN 16-Lead (3mm × 3mm) Plastic QFN
0°C to 85°C –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.For more information on lead free parts, go to: /leadfree/ For more information on tape and reel specifi cations, go to: /tapeandreel/
ORDER INFORMATION
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Note 1: Stress beyond tho listed under Absolute Maximum Ratings may cau permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reli-ability and lifetime.
PARAMETER CONDITIONS
MIN
石灰吟于谦TYP MAX UNITS
SHDN Voltage Low 0.4V SHDN Pin Bias Current 35
50µA f SET Voltage High 1.5
V f SET Voltage Low 0.4
谈判官剧情介绍V f SET Bias Current f SET = 2V 22
40µA CTRL to FB Offt CTRL = 0.5V
●–5–10221015mV mV
APD Current Monitor Gain I APD = 250nA, 10V ≤ MONIN ≤ 90V
I APD = 2.5mA, 20V ≤ MONIN ≤ 90V
●●
0.1800.185
0.200.200.2150.215
Monitor Output Voltage Clamp 11.5
V APD Monitor Voltage Drop MONIN – APD at I APD = 1mA, MONIN = 90V 5V MONIN Pin Current Limit
APD = 0V, MONIN = 40V
15
mA
The ● denotes the specifi cations which apply over the full operating temperature range, otherwi specifi cations are at T A = 25°C. V IN = 3V, V S H D N = 3V unless otherwi noted.
ELECTRICAL CHARACTERISTICS
Note 2: The LT3482E is guaranteed to meet specifi ed performance from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statisti-cal process controls. The LT3482I is guaranteed to meet performance specifi cations over the –40°C to 125°C operating temperature range.
U
U
U
PI FU CTIO S
理想信念方面存在的问题及整改措施
APD (Pin 2): Connect APD cathode to this pin. MONIN (Pin 3): Current Monitor Power Supply Pin. An external lowpass filter can be included here to further reduce supply voltage ripple.
V OUT2 (Pin 4): Voltage Doubler Output Pin. Put a 50V rated capacitor between this pin and V OUT1. Tie a resistor divider to the FB pin and GND.
V OUT1 (Pin 5): Boost Output Pin. Put a capacitor between this pin and the GND plane. Minimize the length of the trace to the capacitor.
PUMP (Pin 6): Charge Pump Pin. Put a 50V rating bypass capacitor between SW and PUMP to form a complete volt-age doubler with the internal integrated Schottky diodes. Minimize trace length to the capacitor.
SW (Pins 7, 8): Switch Pin. Minimize the trace length on this pin to reduce EMI.
GND (Pins 9, 10): Ground. Pins connected internally. For best performance, connect both pins to board ground. V IN (Pin 11): Input Supply Pin. This pin must be locally bypasd.SHDN (Pin 12): Shutdown Pin. Tie to 1.5V or higher to enable device; 0.4V or less to disable device. This pin also functions as soft-start between 1.5V and 2V.
CTRL (Pin 13): Internal Reference Override Pin. This allows the FB voltage to be externally t between 0V and 1.2V. Tie this pin higher than 1.5V to u the internal reference of 1.235V.
FB (Pin 14): Feedback Pin. Connect the output resistor divider tap here.
f SET (Pin 15): Oscillator Frequency Selection Pin. Tie this pin to above 1.5V or higher to lect the higher switchin
g frequency of 1.1MHz. For lower switching frequency, tie to GND.
MON (Pin 16): Current Monitor Output Pin. It sources a current equal to 20% of the APD current and converts to a reference voltage through an external resistor. Expod Pad (Pin 17): GND. This pin must be soldered to the PCB.
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