Absolute Maximum Ratings
Junction Temperature Range, TJ...........................................................................................................................–40°C to 150°C
Storage Temperature Range, TSTORAGE...................................................................................................................–65° to 150°C
Lead Temperature Soldering: Reflow ..........................................................................60 sec. max above 183°C, 230°C peak
ESD, Human Body Model ........................................................................................................................................................2kV
PIN SYMBOL
VCC
PIN NAME
IC Power Input
VMAX
VMIN
ISOURCE
ISINK
30V
30V
6V
–0.3V
–0.3V
–0.3V
–0.3V
–0.3V
0V
N/A
1mA
10mA
1mA
4A
200mA
1mA
SS
Shutdown/Sync
Loop Compensation
Voltage Feedback Input
Power Ground
VC
10mA
1mA
FB
10V
0.3V
0V
PGnd
AGnd
VSW
10mA
10mA
3A
Analog Ground
Switch Input
N/A
10mA
40V
–0.3V
Electrical Characteristics: 2.7V < VCC < 30V; Industrial Grade: –40°C < TA < 85°C; –40°C < TJ < 125°C; Commercial
Grade: 0°C < TA < 70°C; 0°C < TJ < 125°C; For all specifications unless otherwise stated.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ꢀ Error Amplifier
FB Reference Voltage
FB Input Current
VC tied to FB; measure at FB
FB = VREF
1.246
–1.0
1.276
0.1
1.300
1.0
V
µA
FB Reference Voltage
Line Regulation
VC = FB
0.01
0.03
%/V
Error Amplifier
IVC
=
25µA
300
550
800
µMho
Transconductance
Error Amp Gain
Note 1
200
25
500
50
V/V
µA
µA
V
VC Source Current
VC Sink Current
FB = 1V; VC = 1.25V
90
1500
1.9
FB = 1.5V; VC = 1.25V
200
1.5
625
1.7
VC High Clamp Voltage
VC Low Clamp Voltage
VC Threshold
FB = 1V; VC sources 25µA
FB = 1.5V; VC sinks 25µA
Reduce VC from 1.5V until switching stops
0.25
0.75
0.5
0.65
1.30
V
1.05
V
ꢀ Oscillator
Base Operating Frequency
FB = 1V
235
30
270
52
305
120
kHz
kHz
%
Reduced Operating Frequency FB = 0V
Maximum Duty Cycle
90
94
FB Frequency Shift Threshold Frequency drops to reduced
operating frequency
0.36
0.40
0.44
V
ꢀ Sync/Shutdown
Sync Range
285
2.5
500
kHz
V
Sync Pulse Transition
Threshold
Rise time = 20ns
SS Bias Current
SS = 0V
SS = 3V
–3
3
–15
8
µA
µA
Shutdown Threshold
Shutdown Delay
0.50
12
0.85
80
1.20
300
150
V
SS = 2.7V ≤ VCC ≤ 12V
SS = 12V < VCC ≤ 30V
µs
µs
36
2
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
