ML4821CP Fairchild Semiconductor, ML4821CP Datasheet - Page 6

• Manufacturer Part Number: ML4821CP
• Description: IC CONTROLLER PWM BOOST 18DIP
• Manufacturer: Fairchild Semiconductor

Specifications of ML4821CP

• Mode: Average Current
• Frequency - Switching: 1MHz
• Current - Startup: 600µA
• Voltage - Supply: 12 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 18-DIP (0.300", 7.62mm)
• Switching Frequency: 110 KHz
• Maximum Operating Temperature: + 150 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 65 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ML4821CP_NL; ML4821CP_NL

ML4821
Functional Description
Oscillator
6
RAMP VALLEY
T
T
T
RAMP PEAK
OSC
RAMP
DISCHARGE
CLOCK
= T
= C(Ramp Valley to Peak) ÷ (I
R
C
RAMP
Figure 1. Oscillator Block Diagram
T
T
C
T
= C(Ramp Valley to Pk) ÷ (8.4mA – I
+ T
DISCHARGE
C
R
8.4mA
T
T
SYNC
I
R T
t
D
Q1
2kΩ
1kΩ
RT
I
R T
2
+
–
/2)
Q2
V
REF
RT
/2)
VOLTAGE and Current ERROR Amplifiers
Output Driver Stage
Gain Modulator
Figure 2. Oscillator Timing Resistance vs. Frequency
1000
100
10
0
10
1nF
20
R
T
(kΩ)
150pF
PRODUCT SPECIFICATION
30
680pF
REV. 1.0.2 6/19/01
330pF
40
470pF
50