SLUS329B − JUNE 1998 − REVISED FEBRUARY 2005
UC1854B
UC2854A, UC2854B
UC3854A, UC3854B
ELECTRICAL CHARACTERISTICS
VCC = 18 V, RT = 8.2 kΩ, CT = 1.5 nF, VPKLMT = 1 V, VVRMS = 1.5 V, IIAC = 100
µA,
IISENSE = 0 V, VCAO = 3.5 V, VVAO = 5 V, VVSENSE = 3 V,
−40°C < TA < 85°C for the UC2854A and UC2854B, and 0°C < TA <70°C for the UC3854A and UC3854B, and TA = TJ (unless otherwise
noted)
PARAMETER
OSCILLATOR
Initial accuracy
Voltage stability
Total variation
Ramp amplitude (peak-to-peak)
Ramp valley voltage
ENABLE/SOFT-START/CURRENT LIMIT
Enable threshold voltage
Enable hysteresis
Enable input bias current
Propagation delay to disable time(1)
Soft-start charge current
Peak limit offset voltage
Peak limit input current
Peak limit propagation delay time(1)
MULTIPLIER
Output current, IAC limited
Output current, zero
Output current, power limited
IAC = 100
µA,
RSET = 10 kΩ
IAC = 0
µA,
VRMS = 1.5 V,
VRMS = 1.5 V,
VRMS = 1.5 V,
VRMS = 5 V,
VRMS = 5 V,
VRMS = 1.5 V,
IOUT = −200 mA,
IOUT = 200 mA
IOUT = 10 mA
IOUT = 50 mA,
CLOAD = 1 nF
CLOAD = 1 nF
CLOAD = 10 nF
VRMS = 1 V,
RSET = 10 kΩ
Va = 6 V
Va = 2 V
Va = 5 V
Va = 2 V
Va = 5 V
Va = 6V,
TA = 25°C
−1.1
12.0
−220
−2.0
−230
−200
−0.2
−200
−22
−156
−2
−14
−1.0
12.8
1.0
300
VCC = 0 V
0.9
35
35
1.0
ns
A
2.2
500
1.5
V
mV
V
−0.9
A/A
µA
−170
2.0
−170
µA
A
µA
VPKLMT = −0.1 V
VFAULT = 2.5 V
VENA = 0 V
Enable overdrive = 100 mV
VSS = 2.5 V
10
−15
−200
−100
150
2.35
2.55
500
−2
300
14
24
15
mV
µA
ns
2.80
600
−5
V
mV
µA
ns
TA = 25°C
12 V
≤
VCC
≤
18 V
Line, temperature
85
80
4.9
0.8
100
1%
120
5.9
1.3
V
kHz
115
kHz
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output current
Gain constant(2)
GATE DRIVER
VOH
VOL
High-level output voltage
Low-level output voltage
Low-level UVLO voltage
Output rise time(1)
Output fall time(1)
Output peak current(1)
(1) Ensured by design. Not production tested.
(2) Gain constant. (K)
+
I
IAC
V
VAO
2
VCC = 15 V
*
1.5 V
I
MOUT
V
VRMS
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