MAX5069 Datasheet, PDF (4/19 Pages) Maxim Integrated Products – High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers

High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
ELECTRICAL CHARACTERISTICS (continued)
(V_IN = +12V for the MAX5069C/D, V_IN = +23.6V for the MAX5069A/B at startup, then reduces to +12V, C_IN = C_REG5 = 0.1µF,
C_VCC = 1µF, R_RT = 100kΩ, NDRV_ = floating, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at T_A = +25°C.) (Note 1)
PARAMETER
NDRV_ Switching Frequency
RT Voltage
Oscillator Accuracy
Maximum Duty Cycle
DEAD-TIME CONTROL (DT)
Dead Time
SYMBOL
f_SW
V_RT
D_MAX
CONDITIONS
f_SW = 10¹¹ / (2 x R_RT)
40kΩ < R_RT < 500kΩ
T_A = +25°C
f_OSC ≤ 500kHz
f_OSC > 500kHz
T_A = -40°C to +125°C
f_OSC ≤ 500kHz
f_OSC > 500kHz
DT connected to REG5
t_DT
R_DT = 24.9kΩ
Dead-Time Disable Voltage
V_{DT_DISABLE}
Dead-Time Regulation Voltage
V_DT
INTEGRATING FAULT PROTECTION (FLTINT)
FLTINT Source Current
I_FLTINT V_FLTINT = 0V
FLTINT Shutdown Threshold
V_{FLTINT_SD} V_FLTINT rising
FLTINT Restart Threshold
V_{FLTINT_RS} V_FLTINT falling
SLOPE COMPENSATION
Slope Compensation
V_SLOPE C_SLOPE = 100pf, RT = 110kΩ
Slope-Compensation Range
V_SLOPER
Slope-Compensation Voltage
Range
V_SCOMP
MIN
25
-2.5
-4
-4.5
-6
V_REG5 -
0.5V
0
0
TYP
2.0
100
60
1.23
60
2.8
1.6
15
MAX
1250
+2.5
+4
+4.5
+6
UNITS
kHz
V
%
%
ns
V
V
µA
V
V
mV/µs
90 mV/µs
2.7
V
Note 1: The MAX5069 is 100% tested at T_A = +25°C. All limits over temperature are guaranteed by design.
Note 2: The MAX5069A/B are intended for use in universal-input power supplies. The internal clamp circuit is used to prevent the
bootstrap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
UVLO/EN is low. The maximum current to V_IN (hence to clamp) when UVLO is low (device is in shutdown) must be external-
ly limited to 2mA. Clamp currents higher than 2mA may result in clamp voltages higher than 30V, thus exceeding the
absolute maximum rating for V_IN. For the MAX5069C/D, do not exceed the 24V maximum operating voltage of the device.
Note 3: Reference voltage (V_REF) is measured with FB connected to COMP (see the Functional Diagram).
Note 4: The SYNC frequency must be at least 25% higher than the programmed oscillator frequency.
Note 5: The internal oscillator clock cycle.
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