NCP5050(2007) 查看數據表（PDF） - ON Semiconductor
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NCP5050 Datasheet PDF : 14 Pages
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NCP5050
ELECTRICAL CHARACTERISTICS Minimum and Maximum Limits apply for TA between -10°C to +85°C and VIN between 2.7 V
to 5.5 V (Unless otherwise noted). Typical values are referenced to TA = +25°C and Vin = 3.6 V (Unless otherwise noted)
Characteristics
Symbol
Min
Typ
Max
Unit
Operating Power Supply
Maximum Inductor Current (Notes 9 and 11) (see Figure 24)
Refer Switch Current Limit section @ 25°C
Vin
2.7
-
5.5
V
IPEAK_MAX
1.0
-
3.0
A
Power Switch ON Resistor
TA = 25°C (I = 100 mA)
SWRDSON
-
mW
200
-
High Current Sense Switch ON Resistor (I = 100 mA and 25°C)
HCSSRDSON
-
250
-
mW
Low Current Sense Switch ON Resistor (I = 100 mA and 25°C)
LCSSRDSON
-
750
-
mW
PWM Oscillator Frequency
FOSC
1.48
1.7
1.95
MHz
Maximum Duty Cycle
MDUTY
91.5
94
-
%
Efficiency (Notes 9 and 10)
EFF
85
90
%
Over-voltage Clamp Voltage
OVPON
20
-
-
V
Over-voltage Clamp Hysteresis
OVPH
-
1.0
-
V
Output power (Notes 9 and 12)
@ Vin = 3.3 V
@ Vin = 2.7 V
Pout
W
4.5
-
-
2.8
-
-
Feedback Voltage Ripple Rejection @ Iout = 20 mA
From DC to 300 Hz (0.2 VPP) (Note 9)
LREG
5.0
2.5
mV
Feedback Voltage in Steady State.@ TA = 25°C
FBV
215
250
285
mV
Input Feedback Current (CM = Low)
IFB
-
-
0.15
mA
Vin Undervoltage Lockout
Vin Decreasing
UVLO
2.0
V
2.7
Undervoltage Lockout Hysteresis
UVLOH
-
100
-
mV
Standby Current, Iout = 0 mA, CTRL = Low, Vin = 4.2 V @ TA = 25°C
ISTDB
-
-
2.0
mA
Quiescent Current, Iout = 0 mA, Not Switching @ TA = 25°C
IQNOSW
-
-
2.0
mA
Startup Time (Note 9)
From CTRL =1.2 V to Start of Switching
STRT
-
50
200
ms
Inrush Peak Current Limit (Note 9)
Time Constant
IPCL
-
1
-
ms
Upper Limit of PWM Dimming Frequency (Note 9)
DIM
-
-
50
kHz
Time out Protection (Note 9)
TOUT
-15%
1.2
+15%
s
Thermal Shutdown Protection (Note 9)
TSD
-
160
-
°C
Thermal Shutdown Protection Hysteresis (Note 9)
TSDH
-
20
-
°C
Voltage Input Logic Low (Pin CM, CTRL)
VIL
-
-
0.4
V
Voltage Input Logic High (Pin CM, CTRL)
VIH
1.2
-
-
V
CTRL and CM Pin Pulldown Resistance
RPLD
175
250
375
kW
9. Guaranteed by design and characterized
10. Efficiency is defined by 100 * (Pout / Pin) at 25°C
Vin = 4.2 V, L = TDK VLF5014A-2R7M1R5
Load = 80 mA, 4 LED (VF = 3.5 V per LED, Cout = 1 mF X5R
11. The overall tolerance is dependent on the accuracy of the external resistor. A 1% tolerance metal film resistor is recommended to achieve
IPEAK_MAX $20 % accuracy.
12. With Schottky diode MBR130LSF and TDK VLF5014A-2R7M1R5 inductor.
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