CS3972
Absolute Maximum Ratings
Input Voltage Range ........................................................................................................................................................3V to 60V
Output Switching Voltage.........................................................................................................................................................75V
Voltage Transient (t
r
=10µs, t
f
=400ms) ......................................................................................................................................60V
ESD (Human Body Model; R=1.5kΩ, C=100pF) ...................................................................................................................2kV
Junction Temperature Range...............................................................................................................................-40°C to +150°C
Storage Temperature Range ................................................................................................................................-65°C to +150°C
Lead Temperature Soldering
Wave Solder (through hole styles only)......................................................................................10 sec. max, 260°C peak
Reflow (SMD styles only) ......................................................................................60 sec. max above 183°C, 230°C peak
Feedback Pin Voltage (1ms transient)...................................................................................................................................±15V
Electrical Characteristics:
For 3V≤V
CC
≤60V,
-40°C≤T
A
≤125°C
unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
Reference Voltage
Line Regulation
Feedback Input Current
Minimum Input Voltage
Supply Current
Supply Current Increase
during switch on time
Switching Frequency
Maximum Duty Cycle
V
C
Threshold
V
C
=0.8V; V
FB
=V
REF
V
C
=0.8V; V
FB
=V
REF
, 3V≤V
IN
≤60V
V
C
=0.8V; V
FB
=V
REF
V
C
=V
FB
=V
REF
V
C
=0.6V; 3V≤V
IN
≤60V
V
C
=open, 1.0V≤V
FB
≤1.5V
V
C
=V
FB
=V
REF;
V
SW
=15V
V
C
=2V; V
FB
=open, V
SW
=15V
V
FB
=open; V
SW
=15V,
duty cycle=0%
33
0.60
1.214
1.244
350
2.6
6.0
25
40
92
0.90
47
1.25
1.274
0.03
1100
3.0
9.0
V
%/V
nA
V
mA
mA/A
kHz
%
V
s
Error Amplifier
Transconductance
Source/Sink Current
High Voltage Clamp
Low Voltage Clamp
Gain
s
Output Switch
Breakdown Voltage
On Resistance
V
C
=0.8V; V
FB
=V
REF
,
∆I
C
=±25µA
V
C
=1.5V
V
FB
=1.0V
V
FB
=1.5V
0.9V≤V
C
≤1.4V,
V
FB
=V
REF
2400
120
4400
200
2.0
0.38
800
7000
400
µmho
µA
V
V
V/V
V
C
=0.5V; 3V≤V
IN
≤60V,
I
OUT
=5mA
V
C
=open, V
FB
=0.8V, I
OUT
=1.25A
75
90
0.6
2
1.0
V
Ω
A/V
Control Voltage to Switch
1.2V≤V
C
≤1.8V
Current Transconductance
Current Limit
Duty Cycle≤50%, T
J
≥25°C
Duty Cycle≤50%, T
J
<25°C
Duty Cycle=80%
Duty Cycle=80% (Note 1)
1.25
1.25
1.00
0.50
3.00
3.50
2.50
2.50
A
A
A
A
Note 1: 16 lead SO wide package only.
2
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
