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UC1847 датащи(PDF) 4 Page - Texas Instruments

номер детали UC1847
подробное описание детали  Current Mode PWM Controller
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1847 датащи(HTML) 4 Page - Texas Instruments

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Note 2. These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.
Note 3. Parameter measured at trip point of latch with VPIN 5 = VREF, VPIN 6 = 0V.
Note 4. Amplifier gain defined as:
G
=
∆ VPIN 7
∆ VPIN 4
;
∆ VPIN 4 = 0 to 1.0V.
Note 5. Applies to UC1846/UC2846/UC3846 only due to polarity of outputs.
Note 6. Current into Pin 1 guaranteed to latch circuit in shutdown state.
Note 7. Current into Pin 1 guaranteed not to latch circuit in shutdown state.
UC1846/7
UC2846/7
UC3846/7
UC1846/UC1847
UC3846/UC3847
PARAMETER
TEST CONDITIONS
UC2846/UC2847
MIN.
TYP.
MAX.
MIN.
TYP.
MAX. UNITS
Shutdown Terminal Section (cont.)
Maximum Non-Latching
(Note 7)
Current (IPIN 1)
1.5
0.8
1.5
0.8
mA
Delay to Outputs
TJ=25°C (Note 2)
300
600
300
600
ns
Output Section
Collector-Emitter Voltage
40
40
V
Collector Leakage Current
VC=40V (Note 5)
200
200
µA
Output Low Level
ISINK=20mA
0.1
0.4
0.1
0.4
V
ISINK=100mA
0.4
2.1
0.4
2.1
V
Output High Level
ISOURCE=20mA
1313.5
1313.5
V
ISOURCE=100mA
12
13.5
12
13.5
V
Rise Time
CL=1nF, TJ=25°C (Note 2)
50
300
50
300
ns
Fall Time
CL=1nF, TJ=25°C (Note 2)
50
300
50
300
ns
Under-Voltage Lockout Section
Start-Up Threshold
7.7
8.0
7.7
8.0
V
Threshold Hysteresis
0.75
0.75
V
Total Standby Current
Supply Current
17
21
17
21
mA
Oscillator Circuit
Output deadtime is determined by the external capacitor, CT, according to the formula:
τd (µs) = 145CT (µf ) 
ID
ID
3.6
RT
(k
Ω)
.
For large values of RT:
τd (µs) ≈ 145CT (µf ).
Oscillator frequency is approximated by the formula:
fT
(kHz) ≈
2.2
RT
(k
Ω)• CT (µf )
.
ELECTRICAL
CHARACTERISTICS (cont.)
(Unless otherwise stated, these specifications apply for TA=-55°C to +125°C for UC1846/7; -40°C
to +85°C for the UC2846/7; and 0°C to +70°C for the UC3846/7; VIN=15V, RT=10k, CT=4.7nF,
TA=TJ.)
APPLICATIONS DATA
ID = Oscillator discharge current at 25°C is typically 7.5.
4


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