CS3972 Datasheet, PDF (2/6 Pages) Cherry Semiconductor Corporation – 1.25A High Efficiency Switching Regulator

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≤VCC≤60V, -40°C≤TA≤125°C unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
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%
1.214
33
0.60
1.244
350
2.6
6.0
25
40
92
0.90
1.274
0.03
1100
3.0
9.0
47
1.25
s Error Amplifier
Transconductance
Source/Sink Current
High Voltage Clamp
Low Voltage Clamp
Gain
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
s Output Switch
Breakdown Voltage
On Resistance
Control Voltage to Switch
Current Transconductance
V_C=0.5V; 3V≤V_IN≤60V, I_OUT=5mA
V_C=open, V_FB=0.8V, I_OUT=1.25A
1.2V≤V_C≤1.8V
Current Limit
Duty Cycle≤50%, T_J≥25°C
Duty Cycle≤50%, T_J<25°C
Duty Cycle=80%
Duty Cycle=80% (Note 1)
2400
120
4400
200
2.0
0.38
800
7000
400
75
90
0.6
1.0
2
1.25
3.00
1.25
3.50
1.00
2.50
0.50
2.50
Note 1: 16 lead SO wide package only.
UNIT
V
%/V
nA
V
mA
mA/A
kHz
%
V
µmho
µA
V
V
V/V
V
Ω
A/V
A
A
A
A
2