UCC1884 Unitrode Semiconductor, UCC1884 Datasheet - Page 3

• Manufacturer Part Number: UCC1884
• Description: Frequency Foldback Current Mode PWM Controller
• Manufacturer: Unitrode Semiconductor

ELECTRICAL CHARACTERISTICS (cont.):
for UCC1884, –40°C to 85°C for the UCC2884, and 0°C to 70°C for the UCC3884, CT = 150pF, R
VREF, VVS = 0V, CSS = 2.5nF, VDD = 11V, Output no load, T
Note 1: Guaranteed by design. Not 100% tested in production.
Error Amplifier Section (cont.)
PWM Section
Current Sense Section
Current/Fault Section
Volt Second Clamp
Output Stage
Undervoltage Lockout
Startup Regulator
Overall
V
V
Minimum Duty Cycle
Maximum Duty Cycle
Input Bias Current (CS)
CS Shutdown Threshold
CS Shutdown Hysteresis
CS Over Current Threshold
Soft Start Charge Current
Soft Start Discharge Current
V
Soft Start Complete Threshold
Soft Start Restart Threshold
Duty Cycle
I
Output Low Saturation
Output High Saturation
UVLO Output Low Saturation
Rise Time
Fall Time
Turn-On Threshold Voltage
Hysteresis
Regulated VDD Voltage
VDD Override Threshold
I
I
VDD Clamp
B
DD
DD
OL
OH
OL
Startup Current
(run)
PARAMETER
I
I
FB = 3V, CS = 0V
FB = 0V, CS = 0V
VVS = 1.4V, T
VVS = 1.4V, T
VVS = 1.4V, T
VVS = 3.7V, T
VVS = 3.7V, T
VVS = 3.7V, T
VVS = 3.7V
I
I
I
I
CL = 1nF
CL = 1nF
f = 500kHz
VDD = 5.4V
IDD = 10mA
O
O
OUT
OUT
OUT
OUT
= 100 A
= –100 A
= 100mA
= –50mA
= –200mA
= 20mA, VDD = 0V
Unless otherwise specified, these specifications apply for T
A
A
A
A
A
A
= –55°C to 125°C
= –40°C to 85°C
= 0°C to 70°C
= –55°C to 125°C
= –40°C to 85°C
= 0°C to 70°C
TEST CONDITIONS
A
= T
3
J
.
ON
1.235
62.08
23.28
MIN
0.95
57.6
60.8
21.6
22.8
= 53k, R
–10
200
2.7
3.6
0.4
8.4
9.5
77
10
–1
12
2
TYP
13.5
–20
600
A
OFF
0.3
3.1
1.3
0.5
0.5
0.5
0.7
8.9
80
20
20
64
64
64
24
24
24
50
30
10
1
0
4
5
= –55°C to 125°C
= 38k, VOUT =
1.365
65.92
24.72
MAX UNITS
1.05
70.4
67.2
26.4
25.2
10.5
10.7
–30
200
0.8
3.5
4.4
0.6
0.9
0.9
1.9
1.2
9.4
+1
83
30
50
70
50
10
15
UCC1884
UCC2884
UCC3884
0
2
mV
mV
mV
mA
ns
ns
%
%
%
%
%
%
%
%
V
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A
A
A