RT8856 데이터 시트보기 (PDF) - Richtek Technology
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RT8856 Datasheet PDF : 23 Pages
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RT8856
Parameter
Oscillator
Frequency
Frequency
Variation
Frequency Range
Maximum Duty Cycle
FS pin Output Voltage
Reference and DAC
Symbol
fOSC
VFS
DC Accuracy
VFB
Boot Voltage
Error Amplifier
DC Gain
Gain-Bandwidth Product
VBOOT
GBW
Slew Rate
SR
Output Voltage Range
VCOMP
MAX Source/Sink Current IOUTEA
Current Sense Amplifier
Input Offset Voltage
VOSCS
Impedance at Neg. Input RISENx_N
Impedance at Pos. Input
DC Gain
Input Range
RIS ENx
AI
VISENx_IN
RFM TON Setting
TON Pin Output Voltage VTON
DEM ON-Time Setting
tON
RTON Current Range
IRTON
Protection
Under Voltage Lockout
Threshold
Under Voltage Lockout
Threshold Hysteresis
Absolute Over Voltage
Protection Threshold
Relative Over Voltage
Protection Threshold
VUVLO
ΔVUVLO
VOVABS
VOV
Under Voltage Protection
Threshold
VUV
Negative Voltage
Protection Threshold
VNV
Test Conditions
RFS = 33kΩ, VDAC > 1.05
RFS = 5kΩ to 50kΩ
Per phase
Per phase
RFS = 33kΩ, VDAC > 1.05
VDAC = 0.7500 − 1.5000
(No Load, Active Mode )
VDAC = 0.5000 − 0.7500
RL = 47kΩ
CLOAD = 5pF
CLOAD = 10pF (Gain = −4,
RF = 47kΩ, VOUT = 0.5V − 3V)
RL = 47kΩ
VCOMP = 2V
RTON = 80kΩ, VTON = VDAC = 0.75V
IRTON = 80μA
Falling edge
(With respect to 1.5V, ±50mV)
(With respect to VVID, ±50mV)
Measured at VSEN with respect to
unloaded output voltage (UOV)
(for 0.8 < UOV < 1.5)
Measured at VSEN with respect to
GND
Min
270
−20
200
--
1
−0.8
−7.5
1.089
70
--
--
0.5
--
−1
1
1
--
−50
−5
--
25
4.1
--
1.45
150
−350
−100
Typ
300
--
--
50
1.05
0
0
1.1
80
10
5
--
250
--
--
--
10
--
0
350
--
4.3
200
1.5
200
−300
--
Max Unit
330 kHz
20
%
1000 kHz
--
%
1.1
V
0.8
7.5
1.111
%VID
mV
V
--
dB
--
MHz
--
V/μs
3.6
V
--
μA
1
mV
--
MΩ
--
MΩ
--
V/V
100 mV
5
%
--
ns
280 μA
4.5
V
--
mV
1.55
V
250 mV
−250 mV
--
mV
DS8856-03 June 2011
To be continued
www.richtek.com
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