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UCC3808 Datasheet(PDF) 4 Page - Texas Instruments

Part No. UCC3808
Description  LOW POWER CURRENT MODE PUSH-PULL PWM
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3808 Datasheet(HTML) 4 Page - Texas Instruments

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UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2
LOW POWER CURRENT MODE PUSH-PULL PWM
SLUS168D – APRIL 1999 – REVISED AUGUST 2002
4
www.ti.com
electrical characteristics, TA = 0°C to 70°C for the UCC3808–x, –40°C to 85°C for the UCC2808–x and –55°C
to 125
°C for the UCC1808–x, VDD = 10 V (See Note 6), 1 µF capacitor from VDD to GND, R = 22 kΩ, C = 330 pF,
TA = TJ, (unless otherwise specified)
output section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
OUT low level
I = 100 mA
0.5
1
V
OUT high level
I = –50 mA,
VDD – OUT
0.5
1
V
Rise time
CL = 1 nF
25
60
ns
Fall time
CL = 1 nF
25
60
ns
undervoltage lockout section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Start threshold
UCCx808–1,
See Note 6
11.5
12.5
13.5
V
Start threshold
UCCx808–2
4.1
4.3
4.5
V
Minim m operating oltage after start
UCCx808–1
7.6
8.3
9
V
Minimum operating voltage after start
UCCx808–2
3.9
4.1
4.3
V
H steresis
UCCx808–1
3.5
4.2
5.1
V
Hysteresis
UCCx808–2
0.1
0.2
0.3
V
soft start section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
COMP rise time
FB = 1.8 V,
rise from 0.5 V to 4 V
3.5
20
ms
overall section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Startup current
VDD < start threshold
130
260
µA
Operating supply current
FB = 0 V,
CS = 0 V,
See Note 5 and 6
1
2
mA
VDD zener shunt voltage
IDD = 10 mA,
See Note 4
13
14
15
V
NOTES:
1. Measured at RC. Signal amplitude tracks VDD.
2. Gain is defined by: A
+
DV
COMP
DV
CS
,0
v V
CS v
0.4 V,
3. Parameter measured at trip point of latch with FB at 0V.
4. Start threshold and zener shunt threshold track one another.
5. For UCCx808–1, set VDD above the start threshold before setting at 10 V.
6. Does not include current in the external oscillator network.


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