Rainbow Electronics MAX5068 - Manual (Page 3)

MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CS Input Bias Current I B_CS V CS = 0V 0 +2 µA
CS Blanking Time t CS_BLANK 70 ns
Propagation Delay from
Comparator Input to NDRV
50mV overdrive 40 ns
IN CLAMP VOLTAGE
IN Clamp Voltage V IN_CLAMP V IN sinking 2mA (Note 2) 24.0 26.0 29.0 V
ERROR AMPLIFIER (FB, COMP)
Voltage Gain A V R COMP = 100k
Ω
to AGND 80 dB
Unity-Gain Bandwidth BW
R COMP = 100k
Ω
to AGND,
C LOAD = 100pF to AGND
5 MHz
Phase Margin PM
R COMP = 100k
Ω
to AGND,
C LOAD = 100pF to AGND
65 degrees
FB Input Offset Voltage V OS_FB 3 mV
High 2.6 3.8
COMP Clamp Voltage V COMP
Low 0.4 1.1
V
Error-Amplifier Output Current I COMP Sinking or sourcing 0.5 mA
+25°C † T A † +125°C (Note 3) 1.215 1.230 1.245
Reference Voltage V REF
-40°C † T A † +125°C 1.205 1.230 1.242
V
Input Bias Current I B_EA 100 300 nA
COMP Short-Circuit Current I COMP_SC 12 mA
THERMAL SHUTDOWN
Thermal-Shutdown Temperature T SD +170 °C
Thermal Hysteresis T HYST +25 °C
OSCILLATOR SYNC INPUT (MAX5068A/B/C/E Only)
SYNC High-Level Voltage V IH_SYNC 2.4 V
SYNC Low-Level Voltage V IL_SYNC 0.4 V
SYNC Input Bias Current I B_SYNC 10 nA
Maximum SYNC Frequency f SYNC f OSC = 2.5MHz (Note 4) 3.125 MHz
SYNC High-Level Pulse Width t SYNC_HI 30 ns
SYNC Low-Level Pulse Width t SYNC_LO 30 ns
DIGITAL SOFT-START
Soft-Start Duration t SS (Note 5) 2047 cycles
Reference-Voltage Step V STEP 9.7 mV
Reference-Voltage Steps During
Soft-Start
127 steps
OSCILLATOR
Internal Oscillator Frequency
Range
f OSC f OSC = (10 11 / R RT ) 50 2500 kHz
ELECTRICAL CHARACTERISTICS (continued)
(V IN = +12V for the MAX5068B/E/F; V IN = +23.6V for the MAX5068A/C/D at startup, then reduces to +12V; C IN = C REG5 = 0.1µF;
C VCC = 1µF; R RT = 100k
Ω
; NDRV = floating; T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)