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MC33470 bảng dữ liệu(PDF) 3 Page - ON Semiconductor

tên linh kiện MC33470
Giải thích chi tiết về linh kiện  Synchronous Rectification DC/DC Converter Programmable Integrated Controller
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ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, PVCC , = 12 V for typical values TA = Low to High [Notes 2, 3, 4], for
min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (VCC = 4.5 to 5.5 V)
fosc
210
300
390
kHz
FEEDBACK AMPLIFIER
Voltage Feedback Input Threshold (Note 5)
VID0, VID1, VID2 and VID4 = “1” and VID3 = “0”
VID4 = “1” and VID0, VID1, VID2 and VID3 = “0”
Vsense
1.764
2.744
3.43
1.8
2.8
3.5
1.836
2.856
3.57
V
Input Bias Current (VCM = 2.8 V)
IIB
20
mA
Transconductance (VCM = 2.8 V, VCOMP = 2.0 V)
GM
400
800
1200
mmho
Open Loop Voltage Gain (VCOMP = 2.0 V)
AVOL
67
dB
Output Line Regulation (VCC = 4.5 to 5.5 V)
Regline
7.0
mV
Output Load Regulation
Regload
5.0
mV
Output Current
Source
Sink
IOH
IOL
120
120
mA
PWM SECTION
Duty Cycle at G1 Output
Maximum
Minimum
DCmax
DCmin
77
88
95
0
%
Propagation Delay
Comp Input to G1 Output, TJ = 25°C
Comp Input to G2 Output, TJ = 25°C
tPLH1
tPLH2
0.1
0.1
ms
SOFT−START SECTION
Charge Current (VSoft−Start = 0 V)
Ichg
7.0
10
13
mA
Discharge Current under Current Limit (Note 6)
(VSoft−Start = 2.0 V, Vsense = Vout, Vimax = VCC, Vifb = 0 V)
ISSIL
30
90
150
mA
Discharge Current under Hard Current Limit
(VSoft−Start = 2.0 V, Vsense < Vout/2, Vimax = VCC, Vifb = 0 V)
ISSHIL
40
64
mA
Hard Current Limit Hold Time
tSSHIL
100
200
300
ms
IMAX INPUT
Sink Current (Vin max = VCC, Vifb = VCC)
IOL
133
190
247
mA
POWER GOOD OUTPUT
Threshold For Logic “1” to “0” Transition
Upper Threshold
Lower Threshold
Vth
0.93
1.04
0.96
1.07
Vsense
Response Time
Logic “0” to “1” (Vsense changes from 0 V to VO)
Logic “1” to “0” (Vsense changes from VO to 0 V)
trPG
200
50
400
100
600
150
ms
Sink Current (VOL = 0.5 V)
IOLPG
10
mA
Output Low Voltage (IOL = 100 mA) (Note 7)
VOLPG
250
500
mV
FAULT OUTPUT
Threshold For Logic “0” to “1” Transition
VthF
1.12
1.14
1.2
Vref
Vsense Response Time Switches from 2.8 V to VCC
trF
50
100
150
ms
Sink Current (VOL = 0.5 V)
IOLF
10
mA
2. Maximum package power dissipation limits must be observed.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. VID1, VID3, VID4 = logic 0, and VID0, VID2 = logic 1.
5. Vsense is provided from a low impedance voltage source or shorted to the output voltage.
6. Under a typical soft current limit, the net soft−start discharge current will be 90
mA (ISSIL) − 10 mA (Ichg) = 80 mA. The soft−start sink to source
current ratio is designed to be 9:1.
7. Sense (Pin 6) = 5.0 V, Comp (Pin 10) open, VID4, VID2, VID1, VID0 = 1.0, VID3 = 0.
PV
CC


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