MC34166, MC33166
ELECTRICAL CHARACTERISTICS (VCC = 12 V, for typical values TA = +25°C, for min/max values TA is the operating ambient
temperature range that applies [Notes 3, 4], unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (VCC = 7.5 V to 40 V)
TA = +25°C
TA = Tlow to Thigh
fOSC
65
72
79
kHz
62
−
81
ERROR AMPLIFIER
Voltage Feedback Input Threshold
TA = +25°C
TA = Tlow to Thigh
VFB(th)
4.95
5.05
5.15
V
4.85
−
5.2
Line Regulation (VCC = 7.5 V to 40 V, TA = +25°C)
Regline
−
0.03
0.078
%/V
Input Bias Current (VFB = VFB(th) + 0.15 V)
IIB
−
0.15
1.0
mA
Power Supply Rejection Ratio (VCC = 10 V to 20 V, f = 120 Hz)
PSRR
60
80
−
dB
Output Voltage Swing
High State (ISource = 75 mA, VFB = 4.5 V)
Low State (ISink = 0.4 mA, VFB = 5.5 V)
V
VOH
4.2
4.9
−
VOL
−
1.6
1.9
PWM COMPARATOR
Duty Cycle
Maximum (VFB = 0 V)
Minimum (VComp = 1.9 V)
DC(max)
92
DC(min)
0
%
95
100
0
0
SWITCH OUTPUT
Output Voltage Source Saturation (VCC = 7.5 V, ISource = 3.0 A)
Vsat
−
(VCC −1.5) (VCC −1.8)
V
Off−State Leakage (VCC = 40 V, Pin 2 = GND)
Isw(off)
−
0
100
mA
Current Limit Threshold
Ipk(switch)
3.3
4.3
6.0
A
Switching Times (VCC = 40 V, Ipk = 3.0 A, L = 375 mH, TA = +25°C)
Output Voltage Rise Time
tr
Output Voltage Fall Time
tf
ns
−
100
200
−
50
100
UNDERVOLTAGE LOCKOUT
Startup Threshold (VCC Increasing, TA = +25°C)
Vth(UVLO)
5.5
5.9
6.3
V
Hysteresis (VCC Decreasing, TA = +25°C)
VH(UVLO)
0.6
0.9
1.2
V
TOTAL DEVICE
Power Supply Current (TA = +25°C )
ICC
Standby (VCC = 12 V, VComp < 0.15 V)
Operating (VCC = 40 V, Pin 1 = GND for maximum duty cycle)
−
36
100
mA
−
31
55
mA
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. Tlow = 0°C for MC34166
= − 40°C for MC33166
Thigh = + 70°C for MC34166
= + 85°C for MC33166
http://onsemi.com
3