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MC33470_06 Datasheet, PDF (3/15 Pages) ON Semiconductor – Synchronous Rectification DC/DC Converter Programmable Integrated Controller | |||
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MC33470
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V,PPVVCCCC , = 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
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Frequency (VCC = 4.5 to 5.5 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ FEEDBACK AMPLIFIER
Voltage Feedback Input Threshold (Note 5)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ VID0, VID1, VID2 and VID4 = â1â and VID3 = â0â
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ VID4 = â1â and VID0, VID1, VID2 and VID3 = â0â
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Input Bias Current (VCM = 2.8 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Transconductance (VCM = 2.8 V, VCOMP = 2.0 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Open Loop Voltage Gain (VCOMP = 2.0 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Output Line Regulation (VCC = 4.5 to 5.5 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Output Load Regulation
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Output Current
Source
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Sink
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ PWM SECTION
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Duty Cycle at G1 Output
Maximum
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Minimum
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Propagation Delay
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃà Comp Input to G1 Output, TJ = 25°C
Comp Input to G2 Output, TJ = 25°C
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ SOFTâSTART SECTION
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Charge Current (VSoftâStart = 0 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Discharge Current under Current Limit (Note 6)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ (VSoftâStart = 2.0 V, Vsense = Vout, Vimax = VCC, Vifb = 0 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Discharge Current under Hard Current Limit
(VSoftâStart = 2.0 V, Vsense < Vout/2, Vimax = VCC, Vifb = 0 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Hard Current Limit Hold Time
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ IMAX INPUT
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Sink Current (Vin max = VCC, Vifb = VCC)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ POWER GOOD OUTPUT
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Threshold For Logic â1â to â0â Transition
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Upper Threshold
Lower Threshold
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Response Time
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Logic â0â to â1â (Vsense changes from 0 V to VO)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Logic â1â to â0â (Vsense changes from VO to 0 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Sink Current (VOL = 0.5 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Output Low Voltage (IOL = 100 mA) (Note 7)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ FAULT OUTPUT
Threshold For Logic â0â to â1â Transition
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Vsense Response Time Switches from 2.8 V to VCC
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Sink Current (VOL = 0.5 V)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 2. Maximum package power dissipation limits must be observed.
fosc
Vsense
IIB
GM
AVOL
Regline
Regload
IOH
IOL
DCmax
DCmin
tPLH1
tPLH2
Ichg
ISSIL
ISSHIL
tSSHIL
IOL
Vth
trPG
IOLPG
VOLPG
VthF
trF
IOLF
210
300
390
kHz
1.764 1.8 1.836
V
2.744 2.8 2.856
3.43
3.5
3.57
â
20
â
mA
400
800 1200 mmho
â
67
â
dB
â
7.0
â
mV
â
5.0
â
mV
mA
â
120
â
â
120
â
%
77
88
95
â
â
0
ms
â
0.1
â
â
0.1
â
7.0
10
13
mA
30
90
150
mA
40
64
â
mA
100
200
300
ms
133
190
247
mA
â
0.93
200
50
â
â
1.04
0.96
400
100
10
250
1.07
â
600
150
â
500
Vsense
ms
mA
mV
1.12 1.14
1.2
Vref
50
100
150
ms
â
10
â
mA
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 softâstart discharge current will be 90 mA (ISSIL) â 10 mA (Ichg) = 80 mA. The softâstart 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.
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